Loading...
HomeMy WebLinkAboutDrainage Report_April 2009 DRAINAGE REPORT REGARDING EFFECTS ON THE SOUTH FORK OF LICK CREEK RESULTING FROM FULL DEVELOPMENT OF DOVE CROSSING SUBDIVISION COLLEGE STATION, TEXAS April 13, 2009 *Revised July 14, 2010 Prepared by: Civil Development, Ltd 2033 Harvey Mitchell Parkway South College Station, Texas 77840 (979) 764 -7743 op ew "Kt% aLft- rte, 66923 •� � ; 11. -'' 7� /4J � /7 General Information and Background The Dove Crossing Subdivision encompasses an area of 107.76 acres on the south side of Graham Road west of SH 6 in College Station, Texas. It is bordered on the north by Graham Road, on the south by the South Fork of Lick Creek, on the west by two schools, and on the east by undeveloped property. At the present time, the site has been partially developed as single - family residential lots. Phase 1 of the subdivision began in 2005. Since that time Phases 2, 3, 4 and 8 have been built. These phases comprise approximately two - thirds of the entire site. Still remaining to be developed are Phases 5, 6, 7 and 9. Except for a small section of Phase 1 that drains to Graham Road, stormwater runoff from the Dove Crossing Subdivision site drains generally southward to the South Fork of Lick Creek. This natural channel is one of the regulated watercourses in College Station that is described in the B /CS Drainage Design Guidelines. It is the receiving stream for several major subdivisions in southern portions of the city and has been studied extensively over the last 10 years as development occurred. These previous studies were used in this analysis and will be referenced later in the report. The most recent Preliminary Plat of the Dove Crossing Subdivision was prepared in August, 2005 (Exhibit A Sheets 1 & 2). On that preliminary plat there is a note that states the following: 12. The storm water detention facilities for Phases IA, 1B, 1C, 2, 3, and 4 of this subdivision will be temporary detention ponds located within the limits of Phases 5, 6, 7, & 9 of the subdivision. The existing ponds on the property will be modified and utilized as temporary detention ponds. The temporary detention facilities will remain under the control of and be maintained by the developer until the permanent detention ponds are constructed. The permanent storm water detention facilities for the entire subdivision will be located in the 9.8 -acre tract shown on this plat. The permanent detention facilities will be designed to meet the requirements of the City of College Station Drainage Policy and Design Standards. A Drainage Study will also be provided with the permanent facility design to show that the 100 year flood elevations for the South Fork of Lick Creek are not increased by this development. As indicated in the note, the existing phases of the subdivision have been developed using temporary detention facilities. These facilities were designed to mitigate adverse stormwater impacts from the developed phases, and they are currently functioning as intended. The report that follows was prepared to address the development of all subsequent phases in the subdivision so that appropriate planning can be made regarding storm drain sizes and roadway locations. The need for this report has taken on a greater sense of urgency as a result of recent agreements between the developer and the City of College Station regarding the construction of Eagle Avenue through the site. This roadway lies on the southern end of the planned residential land use area, and it serves as a border between the residential lots and the natural vegetation found along the South Fork of Lick Creek. Construction of Eagle Avenue is currently underway and, when completed, will provide improved traffic circulation for the new elementary school on the adjoining tract that is planned to open in August, 2009. Flood Hazard Information The South Fork of Lick Creek is not a FEMA regulated stream according to FEMA Panel No. 48041CO201- D. As a result, no property in the subdivision or in the adjoining subdivisions falls within the 100 -year floodplain as defined by FEMA. The current version of the BCS Unified Stormwater Design Guidelines, as well as the previous controlling document referred to as the College Station Drainage Policy and Design Standards, both list the South Fork of Lick Creek as a regulated stream. These documents require that the finished floor of houses adjacent to the channel be raised to 3 feet above the base flood elevation associated with the ultimate basin development condition. In the absence of FEMA requirements, this local regulation was implemented to account for anticipated rises in water surface elevation as development in the drainage basin occurred. Generally, it appears that the regulation has been followed, although it is not clear what model was used to generate the flood elevations associated with the ultimate basin development condition. At this time, there are no known flooding issues within the basin. Development in the Drainage Basin of the South Fork of Lick Creek Over the past 10 to 12 years, the drainage basin of the South Fork of Lick Creek has experienced some of the most intense development of any basin in College Station. Large subdivisions including Edelweiss Gartens, Alexandria, Westfield, Westfield Village, Cypress Meadow, and a portion of Shenandoah Subdivisions all fall within this drainage basin. Several smaller subdivisions also lie within the basin boundaries. It is estimated that approximately 90% of the basin has been or is currently under development. Exhibits B & C show the Pre - Development and Post - Development Drainage Area Maps that reflect the amount of development in the drainage basin. Hydrologic and Hydraulic Analysis As part of the stormwater analysis for this development, HEC -HMS and HEC -RAS computer models were prepared to study the effects on water surface elevation in the South Fork of Lick Creek. These models were built upon previous work by other engineers (McClure & Browne, Mitchell & Morgan), which begin at the upper reaches of the stream in the Edelweiss Gartens Subdivision near SH 40 and extended downstream to the confluence with the North Fork of Lick Creek. The models were adjusted to incorporate effects from the known detention ponds in these recently developed parts of the drainage basin. Additional survey data of stream cross - sections was added to more closely represent the actual field conditions through the stream segment affected by the Dove Crossing outfall. Table 1 provides a listing of the hydrologic modeling data, runoff coefficients and lag times used to determine runoff and flowrates in the HEC -HMS model, which was in turn used as input for the HEC -RAS model. Table 1 HEC HMS Modeling Data Used in the Dove Crossing Analysis Pre- and Post - Development Conditions 1 Drainage Area ...... ............................... ........................... CN ............... 1 % Impervious 1 L ............................. (see Exhibits B & C) I Acres Sq. Miles (hours) Pre - Development Conditions 1A 78.99 1 0.1234 86 49 1 0.61 1B 1 19.67 0.0307 86 1 48 1 0.34 1C 93.09 0.1455 85 1 42 1 0.59 1D I 23.28 0.0364 1 85 I 45 0.46 1 E i 6.74 0.0105 82 i 29 i 0.21 3.1 70.24 1 0.1098 1 82 i 29 0.64 3.2 21.00 0.0328 82 1 21 i 0.10 10 0.70 4.1 67.33 0.1052 77 0 4.2 i 33.71 0.0527 84 38 i 0.41 4a I 20.00 i 0.0313 84 38 i 0.40 5 31.63 1 0.0494 82 30 1 0.40 5a 21.52 0.0336 84 38 1 0.40 5b 12.12 i 0.0189 I 75 0 I 0.40 6 37.63 1 0.0588 1 75 1 0 0.78 6a 41.73 1 0.0652 84 38 1 0.38 6b I 61.80 1 0.1070 75 0 1 0.50 7 11.54 i 0.0180 i 84 38 i 0.40 7a 81.23 i 0.1239 1 80 20 I 0.39 8 37.03 1 0.0579 1 75 0 i 0.87 8a 81.09 1 0.1267 1 84 1 38 0.31 Total 854.98 1 1.3359 Post - Development Conditions (only the areas noted below changed from those above) 3.2 * 22.35 1 0.0328 82 21 0.10 5 * 34.14 1 0.0494 82 30 I 0.40 5b * 12.18 0.0189 75 0 0.40 6 1 37.63 0.0588 1 75 • 52 0.50 6b 68.46 0.1070 1 75 52 1 0.38 7 * 9.43 0.0180 84 38 0.40 *Note: These drainage areas involve minor changes in area resulting from grading patterns in the vicinity of the Dove Crossing Subdivision. No other parameters in the model were changed in these drainage areas. A number of scenarios were analyzed using steady -state modeling techniques to determine the appropriate size and location of detention ponds that could offset the increase in water surface elevations resulting from the Dove Crossing Subdivision. None of these scenarios were successful in reducing water surface elevations to pre- development conditions. In all cases there were small increases in surface elevations, even with the use of very large ponds. To address this issue, the engineering firm of Mitchell and Morgan Engineers and Constructors were retained to analyze the system using the unsteady flow option in HEC -RAS. Following several iterations, a solution was found using the pond shown in Exhibit D. This design is referred to as a side - channel weir detention pond and it is used to control the maximum water surface elevation in larger channels. Under this design, water from the development outfalls directly into the stream and the pond stays mostly empty until such a time that the water surface elevation in the stream reaches the weir height and it begins to flow into the pond. The pond is designed to hold sufficient volume so that the maximum water surface elevation in the stream does not exceed the desired level. Once peak flows in the stream pass and the surface level begins to recede, water inside the pond drains out slowly through a small outlet pipe (see note). The full report on this pond by Mitchell and Morgan is provided in Appendix 1. Their report includes an exhibit showing locations of all cross - sections in the HEC -RAS model. It is referred to as Exhibit 2 in the Mitchell and Morgan report, but it is included as Exhibit E in this document. A comparison of Pre- and Post - development water surface elevations at each cross - section are shown in Table 2. Note that this is a partial listing of cross sections included in the HEC -RAS model beginning a short distance upstream of the Dove Crossing Subdivision. A full listing of all output from the HEC -RAS model is shown in Exhibit F. Note: The outlet pipe allows a controlled amount of water to flow into the pond any time that the water surface levels in the stream exceed its flowline elevation. During high flow situations, some amount of water will be in the pond before it begins to fill via the weir. This loss of storage is accounted for in the models and the pond is sized to provide sufficient storage volume in addition to this amount. Multi - Use Design The developer recognizes that the proposed detention pond will remove a large part of the natural vegetation along the stream bank through the site. The pond will also be physically separated from the rest of the subdivision when construction of Eagle Avenue is completed. As a result, there is a high potential that the pond will not receive the attention or maintenance that it should. If left alone without proper maintenance, the pond will eventually become overgrown with undesirable vegetation and potentially loose its effectiveness as a flood control device. It an attempt to address this scenario, the proposed detention pond has been designed slightly larger than what is needed to meet the city's drainage requirements. Its size and shape have been laid out such that it can accommodate three practice soccer fields as shown in Exhibit D. These are youth size fields that are intended to supplement those being planned in the nearby city park adjacent to Creekview Elementary School. These fields will provide an amenity to the residential neighborhoods in the area much like those in Edelweiss Park along Victoria Avenue. As a result, it is likely that they will be maintained properly, thus allowing the pond to provide its intended level of flood protection. Conclusions and Recommendations The detention pond shown in Exhibit D provides sufficient storage capabilities to prevent 100 -yr water surface elevations in the South Fork of Lick Creek from increasing following full development of the Dove Crossing Subdivision. Since the development is located adjacent to a Primary Stream as identified by the BCS Drainage Design Guidelines, it does not have to be designed to regulate flows from lower frequency storms. Therefore, we conclude that it is in compliance with the detention requirements for the City of College Station. It is recommended that the detention pond shown in Exhibit D be constructed as part the next phase of the Dove Crossing Subdivision and fulfill the requirements of the Preliminary Plat for all remaining phases. Table 2 Comparison of Pre - Development and Post - Development Runoff Rates • Pre - Development Post- Development Change in Reach ? River Sta I Profile Q Total I W.S. Elev Q Total I W.S. Elev WSEL • (cfs) I (ft) (cfs) I (ft) Upper Reach I 7237.50 I Max WS 1,210 I 286.99 1,211 I 286.99 0.00 Upper Reach I 7053.31 I Max WS 1,211 I 286.78 1,212 I 286.77 -0.01 Upper Reach I 6949.65 I Max WS 1,212 I 286.67 1,213 I 286.67 0.00 Upper Reach I 6829.90 I Max WS 1,213 I 286.54 1,213 I 286.53 -0.01 Upper Reach I 6784.00 I Max WS 1,212 I 286.39 1,211 I 286.38 -0.01 Upper Reach I 6752.00 I Max WS 1,158 I 283.39 915 I 283.24 -0.15 Upper Reach I 6661.00 I Max WS 1,244 I 284.73 1,235 I 284.63 -0.10 Alex- Outfall I 690.00 I Max WS 110 284.84 62 I 284.65 -0.19 Alex- Outfall I 688.47 I Max WS 110 I 284.84 62 I 284.65 -0.19 Alex- Outfall I 609.29 I Max WS 110 I 284.82 -159 I 284.53 -0.29 Alex- Outfall I 400.00 I Max WS 102 I 284.73 -187 284.63 -0.10 Across Pond I 6618.00 I Max WS 1,346 I 284.73 1,048 I 284.63 -0.10 Across Pond I 6615.00 I Max WS 1,346 I 284.72 1,048 ' 284.62 -0.10 Across Pond I 6409.00 I Max WS 1,346 I 284.05 1,275 I 283.95 -0.10 Across Pond I 6222.00 I Max WS 1,346 I 283.56 1,275 I 283.47 -0.09 Across Pond I 6161.00 I Max WS 1,346 I 283.45 1,275 I 283.35 -0.10 Across Pond I 6160.00 I Max WS 1,346 I 283.45 1,275 I 283.35 -0.10 Across Pond I 6040.00 I Max WS 1,340 I 283.00 1,267 I 282.88 -0.12 Across Pond I 6036.00 I Max WS 1,340 282.98 1,267 282.86 -0.12 DoveXingOutfall I 210.00 I Max WS 11 I 283.30 132 I 282.87 -0.43 DoveXingOutfall I 208.39 I Max WS 11 I 283.30 132 I 282.87 -0.43 DoveXingOutfall I 126.62 I Max WS 174 I 282.99 132 I 282.85 -0.14 DoveXingOutfall I 78.16 I Max WS 174 I 283.01 132 I 282.85 -0.16 Lower Reach I 5929.00 I Max WS 1,514 I 282.98 1,414 I 282.86 -0.12 Lower Reach I 5813.00 I Max WS 1,514 I 282.27 1,413 I 282.14 -0.13 Lower Reach I 5602.00 I Max WS 1,532 I 281.82 1,429 I 281.68 -0.14 Lower Reach I 5306.00 I Max WS 1,601 I 281.54 1,490 I 281.41 -0.13 Lower Reach I 5186.00 I Max WS 1,600 I 281.33 1,489 I 281.20 -0.13 Lower Reach I 5036.00 I Max WS 1,599 I 280.76 1,488 I 280.62 -0.14 Lower Reach I 4916.00 I Max WS 1,614 I 280.19 1,498 I 280.04 -0.15 Lower Reach I 4796.00 I Max WS 1,630 I 280.04 1,496 I 279.90 -0.14 Lower Reach I 4566.00 I Max WS 1,646 I 279.62 1,535 I 279.47 -0.15 Lower Reach I 4296.00 I Max WS 1,663 I 278.82 1,561 I 278.65 -0.17 Lower Reach I 3846.00 I Max WS 1,697 I 277.28 1,619 I 277.07 -0.21 Lower Reach I 3651.00 I Max WS 1,704 I 277.08 1,632 I 276.85 - 0.23 Lower Reach 1 3596.00 1 Max WS 1,703 1 277.00 1,631 1 276.71 - 0.29 Lower Reach I 3582.00 I Max WS 1,703 I 276.66 1,631 I 276.40 -0.26 Lower Reach I 3524.00 I Max WS 1,703 I 275.58 1,631 i 275.56 -0.02 Lower Reach I 3506.00 I Max WS 1,703 I 275.95 1,630 I 275.90 -0.05 Lower Reach I 3453.00 I Max WS 1,703 I 276.00 1,630 1 275.94 -0.06 Lower Reach I 3396.00 I Max WS 1,712 I 275.95 1,640 I 275.90 -0.05 Lower Reach I 3186.00 I Max WS 1,746 I 275.58 1,676 I 275.55 -0.03 Lower Reach I 2866.00 I Max WS 1,793 I 275.26 1,733 I 275.24 -0.02 Lower Reach I 2546.00 I Max WS 1,789 I 275.05 1,731 I 275.05 0.00 To the City Engineer for the City of College Station, Texas: Re: Dove Crossing Subdivision, Phases 1 -9 Certification Statement 1 have conducted a topographic review and field investigation of the existing and proposed flow patterns for stormwater runoff from the Dove Crossing Subdivision to the main stem of the South Fork of Lick Creek At build -out conditions allowable by zoning, restrictive covenant, or plat note, the stormwater flows from the subject subdivision or site project will not cause any increase in flooding conditions to the interior of existing building structures, including basement areas, for storms of magnitude up through the 100-yr event. /Z42)1 / �/i3/o 66W23 Engineer 's Signature Date Tx License No. Seal 411N lb -; •8 l a,- Ir $ .4 vg :. .J. .4.....- .. 65023 s J r; �/� x `s 1111 - J \ 4 A a ...t1_41.1.- C 1 � b — � �G� C a _t" \ $ �- - 1 . 0 1 ' b it - - -Z_ 9 av�' "` avid a � v 0 (( I. F1 ( , <<- f Z - M. r �L L Z90 7 • . : :I: / I ~n n / Lsau i i. _� ill soa� • n _mu_ all _mom _ :. / III ill ' LI 117 1@L IIt la:- - SOIL '7 J67L _ - `' � �� �_� �� ..' i , - r Y," Hollow -._� ! � [ �rr 77 , t .pp�� ,,>A.q sss•••000��� +��� YI ^I it 1 4: 4, r.-. ro r s y 1 . .. r C ' M (,- l � ,,, �:- C r3- - -r r "Rm � ' rigoi--isar r ._� , 1 ia: r -r \ ,I A � i ,r ., - ' t R�-,'� lea - � :1 le ai 1 1 . t 'a 1 1 ri ! r 1 t :I r 1 1 [q g 3 j I�, i . °r, I. 1( k � 1 ; 1 � -{ = I I1 � ° a 1 it 9 1 o . ° I I . . - I 1� )I� C CU R $ . _� - 1 t + WI tt C7t ' ' 3 '. f I V - +1 : 1 1 N' W II IN , I - 1 - "IV I � . I '[ • - (, u - _ a l p . - ` �..' n"� t v� , it :. . •„ � C' �. 0 1 11. i : u �I -' F ,/ �, 11 r.r ' t �u. ..,w,.., : :. F eg I NN R IR c+ l`. c w >11 n I _ a ,` I . � ,, I , t tt. � � `t � � E t , 4 ('; ', ' l , M ; tf, ul 9" l� t1 p N.\\\V ( � ,. t 'r A r I ` ` 6 p •'It I1L [[..( @ e�7 � 4 ; j\ \ hft L ' 'li R1p p ¢ . j ' - R .(?e ' \tk 5�' ... „ / � o . : l � 1; (rl ° • n ' ` f I ° I )1 11 1 . 1 I - 5'. 1 8 al 'I I ' ,1'', - , � ` . S. f qq k�- P � Fa.� � � �+hwar �. ¢c � s-raa -u 5 .�.r.+. , ,LL <� w i ,`. - _ 'n"�y"�... , i e�. �Y 11 1 u l I 4 If i ii( • xo k 1 u 1 1 (: r' a _ l "• -a � ,�l c :: . t — .._ s. � 3.2a. a�,a ;: t 4 a� �.,� -r„ } r f S 1 NI I: co li` I l�� i§ / ��` :i `�� �IVII _ �� I 1 �? I II 11 1'I I y1 Li�crui �i W Y w � 1 _ i 16 6 ; f � 1 ;.i�: � i Ni / OE , Iii " 1 I K _ t, I ° 14' I 1` a y r PPP fl \. I _ ul I III 1 ,� ' ;... I ., a 1,i u i II 1 u - II I n \ ,� I I - > i>ti I. . imolai. I I , 1 1 i, 1M I ry e n i , I I 1 : i ¢ -1-, ] 1 ll IF 1l " "'.�T "� 1 I C �,. 41 i - N :I - n� -lot w � 111 i I 1 tv- IF i- \ l I. jog - 11 11 MI - I Jig G ,ilims. 1161441_ , - L I B c1 c 11 i „ �)a - tI : I' ' 1 I q - - °„ t 1� r. 1 'I ' a -+,•+ -„.� ' 11- / � . I I 9 LL , I 1 1 11 S 1 � 1 R � � � �� � .` 1 I I I CPI gt lJ : G : u ; 1. ' k g 0 G�1 � ' 11 I � 1 � " A °' I C I_ I, I k t 1 * I G/ 1 I > , • i li " �., -311 i:>Y, _. 3 r • n t, ^.,1a� '�'� a 2 . ,x ` , I - . -�.', • I{ t r � � 4w' n? - n�A 1 1 \ � G 3) I 3 11 I r- o9 P 1 I _ tee,,, .'f' S£l I $$ lc ,�, I U I ,I I - I l . 11 1 1 , i1 1 $ f 1� I I 1 n e I I , I - 11 i4 I cos,_ I B i � . p I' ^ 1 , _ w u g 1 '; . P 11 Al Ii ii + 'I I �; ' ;i S' 1 ° , t I : Ilff 1i ,, I 9 1 - 4 �/ �� i I 1 1r ; I1 ( � ' . a ' .. s i B , 11 q 1 ^A'>•' } a: J :: [ p p L _ . ' a1 1 11 1 Iipmg ' I 1 1 I ' l l 5 , �I`, 1L I I ' - x p'R C` =MI up- ii,miL, 8 / K ` 1. i. i f 4 i I , ; ;-� t �,if, i „i, .i� i'; ri ; y '� G I k _ - 1 i °" i 1 , I. / I' � I I - iii • .v 1 «1 �� .. J 1 =' !El Lt i lb '� � I Ir s�� �» � �a . ' ar : fc J c 1101I_C 1 � no r ; vorti.iisii t 19 ELS- 31,L11Z£.9bS , no I 11 I� I / I. // M i L -3 4. I il el, _p 1- 1 X14 • 1 ) ���Jff iI J 1 I f' / a_ i -'' ,31 • L__- / o - Y c � ' - - ' I Vg, Irt A 1 t m y 1 3 yy . -YI 1 u1 Z i A E . q� M _ _I G l�l ,1 il! I t. ) I i\ -\\) b 1 � ilk 1 ` I a . 1 u/ t I p j I 1 & 1 ( IOIPJLPIE ,. . s...°.it: L'e -... •. .. _.. t ° fly:,,. ,,,�•' "-v is s. - A in mi. PM ) - ,„,_, .../.. X11 � , - - r 1' .� - 11111111411E ) / 1 ,--- . r 11 � 17 - 71 '' 1 t A>< * - �1�t - -� T Mr —` 71i -Awl ,..;. 2 �: i / ,£S - 9Z 1• '- 3.OZ.Ct Lt S j \ I - N O 'r .,,,,,..b.rf, t. ,, s; ° $ a l p ;„ , A , 4 I • I =z 7,,z- VI ,sexy' O N va H&c P i, 1 * y mmmm��mm V • I x ` H � r � +a � a y O a :sq.. A rrrrrrrr = 2 2 2 2 2 1, Sd ° " y 1 k ''''` v r 000Q0000 IT! W ✓' 1.. 'k mgg 2 a 70 0 < It s 1 r i cno5w1 DDDDDD m rn to G ' gy m r o mm ���� _��Acant 11:111:itli mm-• i o � O SO cc u a 11 0a'> • p ti 2 "1 VI -i �e ' '." -NU� j tp Oo 11 II 11 O " N , { Y # i ��nn O d G,, D V N V OD 6 I� . / '� (� a ° u -§ m mmmmmm N m r m O r,,3 0. _. `� ! a s r*� rrrrr _ _ ° z < 88X888 c D i ( D � ,( D D D 'mi (I) r �i� < m xxxxxxxx nn P -4:1": v:r' Z o�.�N,om 01 t Z I 00 z _ m i • mO 0000 )' q CO Z ,' 1 I I I I o Z ww mw u�w .-Dv /3 > ®� "x.,`, x If qIf Ip D (,),:,t. Or ii ������i�x ..... D T /'°"' Z rro 1 8 11 I 1 I to rn ,3 Z m c.c... /�J $" N^ c 0 —y1 r7 c =m�fv • Z O O A ccccccc om::'`I mm�I ' m 6 4 E 4 c o c c u u u u u m u o Q ,, a w w w w w w w ----- -1-• Cn „„c, (es) J iiiiiiiiiiiiii T g ia c G m �_,� D t c �i � � gi N • c a n 'c c a 0 z 3 n .RI 61; X x 7c x x x N 0) Ol f0 O O P' `! ; m Ul ��omm l DDD \ r iiiril� i �� a c , i " U11++mJ. X 00 0 1 0 000 nnn' n '^ N ,o, O �� QQQQ i �� N w welwtai NN VJ ^ :—. ct Z �J•O CCCCC CC O v N A '"4awon18 z kk �, EXHIBIT * CIVIL DEVELOPAN T,Lt.* x CIVIL ENGINEERING DE81O -8ULLD SERVICES rti M > DOVE CROSSING DRAINAGE STUDY 2033 Harvey Mitchell Parkway South x SOUTH FORK LICK CREEK DRAINAGE BA College Station, Texas 77840 m DOVE CROSSING SUBDIVISION PRELIMINARY PLAT ••• P Box 11929, College Station, Texas 77842 - 9 (SHEET 1 OF 2) "' COLLEGE STATION, TEXAS (979) 764 -7743 Fax: (979) 784-7769 , � NEM g :GGrGG�� ���r0��00�0�Or0�:� r� �r0:�i:::r:::::li: :r: ���� r ���I��0�r00���i On (j \\� ht \, ; I •'"y • I, , \ �� 3333333333333333333�� 33333 3333I33333�33333333333333 333333333 33m3�0ME P � �3�3 1133 1 11 �3 �3m30 X33 \ ; /.�< , s 333333333333333333333333 3333333333333333333333333333333333�33333333m3�0�33333333 A , , - \ , ,; �, 33333333333333333333333333333333333333333333333333333333333333333333m33�333333333 _ \ k , 1 :27:11::::::::::::::::22::::::::::::2:21:1::::2 10111 \ > \ \ \\,,, \. \: • 5 • i i INI@9N98�93'EG�OG33� anuanVmpunxolV 'r , V l • 9L b0,90o9t�S • ' 4:::::::::::::::::11:ININIIIIM 333333333333333333333333 1111,v111111111/ v 1 ` l . i \ \ � ` �1� `� ``\ < c\\L ( � \ 1 IV 1 ::::: \ms=s `'�� �.,,+ Q � \� \�� \� \A � ' - I 1 1:::::::::::::::::::::::::::::: : 333333333333333333333333 . (, .��„� , : \`�� : _ IPA yy xa , I� __ Y U ` 1 �\ �\ ' S 33333333333333333333333 : , 1 , , . :11:1 . IRE ,W \ 1 ' 0 ili ; o �¢� \,. , h\ - El IIIE _} 111/ WWI ‘;‘ .,,‘..\v: = -,- , ,,,,\\.\,'%* lyt II 1 c - N _____. mil '''-', ‘‘1:. ‘ AA , c g . 'i _. , • !w V . \■\ \ \\ANMte __.- , ,,;,,,,,,,,, , :Av., 4 ,,, d'I 'rip I li i ii 911 11 ill: g ii5 1 i PT 111 li i ! 1 7 .: ; li 1 3N \ss \''` .‘1, \- :-.! MV ' k,/ •-% \ ' • 12 go . fi 1 hi i 1 - p; ggg Will 5 2,i PI Pi 1 ii14; Si , ,. ,, - . - ,-, Ak4t 1 I il 9 4 1 ii „ $ :1111111q1 2 141 5 r12 1J J 1! 1 $a ! ( _ 9 51 111 m'a� 1 1R 4 ;i ? O 1 >R it A 1 p 1 5 , ...." .; g01 l gag - §N 1 14 $ A y a 1 giid 4 Qx P g ga l l 8 1 g4 : 4 WI iX 125 y 1 1 it 5 g W 1 Rio ,� � ` , , I r iri, � M g i m p 0 4� a Li q ,sus 1� 0 "✓ 4 1 1 4 g10i" 1 J i B. ilk 1> _ _ _ 7 a ij 1 i: 41; 1 X IIi i I d 1 0 A R g �'.r t / m � ' s li NI \ 7,, / :///:: / ...- ll'' cn 1: * al / ) % 44 ,,,, i wo i Mg x ( 4p. i i Mil Mil mO -0r Z\ o x 0 m > ---- 5 , \ •i. 30 0 — I Z.,,,.... S ( iii rn !,,1 c !!149 MI � f > uV x, t P3 -• 0 8 O V p ' 7] I V 3 0 0 s o r p r r r r 2 2 T. 2 S S x ; ' P i m a 000 §ow6 D D D D D D m rn \ 111110°11 N „�u °� ,� < II m w w w w In 1n w to N to 1 „ i e w "rm- o mm v iiggy pw N m _ mm _ n i e IV C (n70 CH o a o n oo D '7'1 /` ae • V N V Oo p w • O .� N N O m O, A Q 17 m�m FPP RP FP NOD t0 a' m '.A `A r ,4,:0.;,,„• ' ;�, '^ y n I TI F Z < FiFii?i2i8F c) c ) c) D D D ( P 3 z i m ri x�cxx n (7 n v _ 7 �- �. \ 2 1 I I 1 O mN aP..w�a�oro Vl f ` 9y9 y s >�. ZI O 000000 0 (0 ` y 0w 0(00titi ti .8 f N Z wwmww w _ � z � z � D b I f II II yegv;c) —II m c t d o c CD /� 1 no mva Oh rp Z to m Gm om (11 OD OI (n m .< X C O' C II II 11 II II -1 QNa m 1 Rlmii Z' ..mmmmm -6,8 (, V O VI UV T o c m re D o pp 00 � � N ot 0600 i.13.2-243:0' Q ° °• gg `J o 3 v n N fps ; 1 1 1,3 I VISL 7c t4F-1 -' i i l q 11 1 �1 1g v7 " p,NOm� mA rr rrrrr >>>p> � ��� ��EE N c a• a O s oil - � ni 25 :,2., NS n n n n 7 :1 (7 m Nom`• =I D E O L y ��O HUM 0 ===11 � v N sq. 51;18 z ,nn N EXHIBIT A r Cn1 DEvdOPMwii LM* DOVE CROSSING DRAINAGE STUDY CNwEUawEERING&DESUw- euaDSERVICES m = SOUTH FORK LICK CREEK DRAINAGE BASIN 2033 Harvey Mitchell Parkway South o m Collage Station, Texas 77840 DOVE CROSSING SUBDIVISION PRELIMINARY PLAT (SHEET 2 OF 2) P.O. Box 11929, College Station, Texas 77842 N COLLEGE STATION, TEXAS (979) 784-7743 Fax: (979) 764 -7759 Exhibit B • Dove Crossing Drainage Study Drainage Area Map Pre - Development Conditions • • ! • i t t%r UI ►11G.t�— .■ �i.�� � �11l+1 /GiM�� ����� i. j d b i�/ GI/IrifilG/ �; � ►" ►'� 111 ��� - � �I i� ' m ������ 1 ` /r►t•■ �■ ■.J 1�t•I ■Ii:+1 s.�: � \�l 1`1 Y `' 1 .■it � �� - _ p tU.� � �1 0.' el�a1 ■rwr. �■� I�w 11, I L �� �J�:rCr:��� .0 v/ ww ■■ asea mo,alu _alai 1ia-+� 1. 4 1115 ^ � rattra ,ae• .�a u�► f.1J :as I�JSis a ■r Isla It►`at�i —� ►>• L' . �., �, � � ,. //J ■L��,111�.;'1��. � �� = ■(� =1�1 � �iy�'CL`�!' S �L� �1♦�� �'����1 1•�1 ,•�/ SIG tta/ r I: 11a�trJ [� I 11 ' ► S rw �, t % i ■■ ran. nr `I +iii to a■a ���l.i�h�,`� ur tlarlr�� gat .1�1 +G,lf:� / /�� i11 1 4&V' ii a -lam j Fiat 1 �► i �� •c f.��� Ira L n.l - \111 \� i' - ,I �j51 Ire r_.au 1. ;�t� .111d11�t� 11 ,,, lou 777 JJJ �iit'� `Q� !�I t1111r1111.t �h Y I;Ca�ICrIC1 '� ��► . , �CO: Cr_�r�'I +[►�EC111 ;; ,�.U.1T.1 �F ►1 N_i� �IIL � ►• . - a11j ?l� Q i l �� ri � _ ....� e e _ `�► ./ �. �1��1+ � � Ire ��I 0 411.,Jt.51 — ►a � � c _ '' � [I.I , f ! W &!$ti i _ I:i I ) Ih,I... il�r �1 ir-1 711 �� �1•L` , 11111' 1 1 A �>� �► Illl�i � � .�.�ihl���, ! ►d�lra ICI /I IA111b_� - �IJIIGICIC�IICI r�l ^ w I �� . re��.l a•.� ,•.._! V �#� � ��Iii�III ' J�� ate+ ► / ri' �� IL J I 4 YAY a� ° �' _� J k !41 .Cre►Q� ►��III�IIINOW __._�- — c � l� I- , •1 � �I � �l �, I �� � 1 1 ;,�rrr Iwls Rlw !�G7` ^� `1`�Ill :a . ��u tra to . ra eat 1 .. t■. i , ����� i�r �a at a;a rai 1 r►�sr� .., M If�4 {1` -1 �y'I� a ar • ■ .l 1 I ..r / . . ����s•��� �� ��� ., „ �Ir_� ,�.. _ .. �( . ark .�,. b�1 L; • /��,�L�1�� �� .0 . li ■ ■ 1 _ >i1r «1t. L �s� uII ur 11I n l:� tea' l I += �;�il II .... .►� raalao t.��� u e'Ia11 us nlrn u�r�nl ul>.II' .■�� I t =� ;i 1 iL: �. tw =� \s�is>lr�,wt► I1. r s ar'�71 ls�l / r„ �1 wws j g1 � i Is �rf ♦►s.w 1 ' 6111 l alp r►� w�wv � 1 wt•1 � . _ -- --•- Lla��l�_a_ 1� r4 , . ► r ate; gat.■ a mow, tr_�� c�t14.� a • ••..t� wry. a_ ,>•w • r,; I�ri�'a.r� c�t� r��l r ►s ri err Ei t ! 4I ! l , ►ar i tr� ,I t.n!Y fi. ■I �... ►..�.. Ivy � � � ,:�r.' ra * as �.a I>•a ..rta ar• a �! �wr �. as t ►��► ��L� +�![i�lE ►s Baal, um �i "� /_�= f � ••I , - l .r= I�:� Mt.� 111 , . • �����'�77v� • 4 wl A D t�l� �i�C�.7�1a�J��l' J��SjpAr ✓.I�� `�'V t',�'ll'�,T .. r Lt1 / _�, '•I� a.Cjl ) JJ Irr� • ��1 i fiA �i I,� ■a c�� >r! dui sau �lu�. .JsQI!% V� °'��' S (ilr`� i��11- i rr: tt. trr. ��nl�(�s��' , f rte. _- �- r ■ ply � � n �+ G/f?JGI�RI /JI��I ���►''�ISlry Ig���% t � [�IIF+ b �♦ � I ii rte �,la..A►.r �1 �� »i ���w�,�+ mot. I , ��1'� .��; 1t `1 /IlA ��I Wlfi y�l •�� ♦ fe:1,, �� n I Ili/ Gala t►/(li I I � �/, t � � n � r �� (i ` I C1:111111�i��w a��i• «�s ��, d), r , f j;r� n ���� Ii;L' o ,rlk -= - ,..�� -,-,_ _ __ , .. - � I� � 1�1i� �- awl : �I►�_.�Gt�L711�! _!.�ILtt�t���� �!^ �ILtlILI'►�lIE �1i�, , .- . .. �I n,� �a��....«.a>�,.._ ����� _,.. ► i , M�[I41111 t 1,��r l ► i'��`�';'i r " ►� G��T �! I��[I `i► w:'�a �� �! -_ . � t_� .- :- ,r,.��..�� I► [sni �!t r�tl .�'t� i �a�� �' - ti �>fC /�11�tt� _ r.. )► ' �� r �+' ■ IM W,_�l �_ �GG� .U►I,� tilll l �� � �1 LI i rr �aln -J��t �IIn��LO t' I ♦�f` w(,.d %I�Ii�I �C[I[1�I:IAl11 j,��� --� �� • ice. , r.I!R l�� .i� 11�l 111�.'1®►v� G 1� r — ______—I------4 - - 1 , o �t 1 EXHIBIT B *CZMDEVM0PAW ',Li DOVE CROSSING DRAINAGE STUDY ava �cm Mitc ellParkwa s 2033 Harvey Mitchell Parkway South m SOUTH FORK LICK CREEK DRAINAGE BASIN CollegaSlation,Texas77840 PRE - DEVELOPMENT DRAINAGE AREA MAP P.O. Box 11929, College Station, Texas 77842 COLLEGE STATION, TEXAS ( 764 -7743 Fax (979) 764 -7759 Carol Cotter - Fwd: RE: Meeting Notes for Barron Road Phase 2 Page 1 of 4 From: Carol Cotter To: Beamon, Daniel Date: 11/11/2009 9:30:20 AM Subject: Fwd: RE: Meeting Notes for Barron Road Phase 2 Daniel - Thanks for the report. We will put it in the files for future reference. My only comment is that you will probably need HOA permission to modify the private pond. I can see them asking the City to take over maintenance as a condition Carol »> Daniel Beamon 11/10/2009 1:23 PM »> Please see the attached drainage impact analysis for the westfield village detention pond. Please let me know if you have any comments. On a side note, can we do any grading in a PUE in order to divert offsite water away from running onto Barron. Thanks for the help. Daniel Beamon City of College Station Graduate Engineer Capital Improvements (979) 764 -3690 (main) (979) 764 -3816 (direct) (979) 571 -2152 (mobile) »> "Boatcallie, Brandon" <Brandon.Boatcallie @jacobs.com> 11/10/2009 12:01 PM »> Daniel, Thanks for clarifying your question. Sorry for the misunderstanding. The drainage report is attached. Thanks, Brandon Brandon M. Boatcallie, P.E. !Jacobs 1 Transportation Engineer 1 979.764.9119 1 979.764,9229 fax 1 Brandon.Boatcallie@jacobs.com 1 www.jacobs.com From: Daniel Beamon [mailto:Dbeamon ©cstx.gov] Sent: Tuesday, November 10, 2009 11:43 AM To: Boatcallie, Brandon Subject: RE: Meeting Notes for Barron Road Phase 2 Sorry, I was checking if you could send me a pdf of the drainage impact analysis you gave me last week. file: / /C: \Documents and Settings \ccotter \Local Settings \Temp \_agv0002 \text.htm 7/21/2010 Carol Cotter - Fwd: RE: Meeting Notes for Barron Road Phase 2 Page 2 of 4 Daniel Beamon City of College Station Graduate Engineer Capital Improvements (979) 764 -3690 (main) (979) 764 -3816 (direct) (979) 571 -2152 (mobile) »> "Boatcallie, Brandon" <Brandon.Boatcallie @jacobs.com> 11/10/2009 11:40 AM »> Daniel, We have a copy of the Westfield Village drainage report. Thanks for checking. Brandon Brandon M. Boatcallie, P.E. 1 Jacobs 1 Transportation Engineer! 979.764.9119 1979.764.9229 fax 1 Brandon.Boatcallie @jacobs.com 1 www.jacobs.com From: Daniel Beamon [mailto:Dbeamon @cstx.gov] Sent: Tuesday, November 10, 2009 8:33 AM To: Boatcallie, Brandon Subject: RE: Meeting Notes for Barron Road Phase 2 Also, do you have a pdf of the drainage report for Westfield Village. If not I can scan it. Thanks. Daniel Beamon »> "Boatcallie, Brandon" <Brandon.Boatcallie @jacobs.com> 11/10/2009 7:53 AM »> Daniel, If you can find the report, that would help. I'm interested in the calculations for the 2 - 24" RCPs under iron horse way. Thanks, Brandon Brandon M. Boatcallie, P.E. 1 Jacobs 1 Transportation Engineer 1 979.764.9119 1 979.764.9229 fax 1 Brandon.Boatcallie@jacobs.comivvww.jacobs.com From: Daniel Beamon [ mailto:Dbeamon@cstx.gov] Sent: Tuesday, November 10, 2009 7:50 AM To: Boatcallie, Brandon Subject: RE: Meeting Notes for Barron Road Phase 2 file: / /C: \Documents and Settings \ccotter \Local Settings \Temp \_agv0002 \text.htm 7/21/2010 Carol Cotter - Fwd: RE: Meeting Notes for Barron Road Phase 2 Page 3 of 4 They did not have any calcs in the plans that I found. However, I can see if they submitted a drainage report if you need it. Let me know. Daniel Beamon City of College Station Graduate Engineer Capital Improvements (979) 764 -3690 (main) (979) 764 -3816 (direct) (979) 571 -2152 (mobile) »> "Boatcallie, Brandon" <Brandon.Boatcallie @ jacobs.com> 11/9/2009 1:21 PM »> Thanks for the layout Daniel. Do you know if there is a drainage area map /h &h calcs included in the plan set for the Iron Horse Way culvert? It would help to see their calcs if they are available. Brandon M. Boatcallie, P.E. 1 Jacobs 1 Transportation Engineer 1 979.764.9119 1 979.764.9229 fax 1 Brandon.Boatcallie @jacobs.com 1 www,acobs.com From: Daniel Beamon [mailto:Dbeamon @cstx.gov] Sent: Monday, November 09, 2009 11:52 AM To: Martin, Michael (Texas) Cc: Boatcallie, Brandon Subject: Re: Meeting Notes for Barron Road Phase 2 The minutes are accurate. However, I checked on the Pittman driveway and it must remain until redevelopment. We need to keep the driveway apron in the plans. Also, see the attached pdf of Iron Horse Way. I am still checking on some things that we discussed in the meeting and I will relay that information to you as I get it. Thanks. Daniel Beamon City of College Station Graduate Engineer Capital Improvements (979) 764 -3690 (main) (979) 764 -3816 (direct) (979) 571 -2152 (mobile) »> "Martin, Michael (Texas)" <Michael.Martin @jacobs.com> 11/9/2009 8:40 AM »> «20091109092200519. pdf» Good morning Daniel, Attached are meeting notes from our November 5, 2009 status meeting on the Barron Road Phase 2 project. Please review for accuracy and let me know if you have any modifications. file: / /C: \Documents and Settings \ccotter \Local Settings \Temp \_agv0002 \text.htm 7/21/2010 Carol Cotter - Fwd: RE: Meeting Notes for Barron Road Phase 2 Page 4 of 4 Thank you very much and have a great day! Michael Michael A. Martin, P.E. Jacobs 526 E. University Dr., Suite 201 -A College Station, Texas 77840 Tel: 979 - 764 -9119 Fax: 979 - 764 -9229 Cell: 979 - 571 -6733 email: michael.martin @jacobs.com web: jacobs.com NOTICE - This communication may contain confidential and privileged information that is for the sole use of the intended recipient. Any viewing, copying or distribution of, or reliance on this message by unintended recipients is strictly prohibited. If you have received this message in error, please notify us immediately by replying to the message and deleting it from your computer. NOTICE - This communication may contain confidential and privileged information that is for the sole use of the intended recipient. Any viewing, copying or distribution of, or reliance on this message by unintended recipients is strictly prohibited. If you have received this message in error, please notify us immediately by replying to the message and deleting it from your computer. file: / /C: \Documents and Settings \ccotter \Local Settings \Temp \_agv0002 \text.htm 7/21/2010 Carol Cotter - Public modification to private detention pond. Page 1 of 1 From: Carol Cotter To: Gibbs, Alan Date: 11/10/2009 9:33:00 AM Subject: Public modification to private detention pond. The Barron Road project is proposing to increase the flow to the Westfield Village private detention pond. I don't think there are any proposed physical changes to the pond, but more flow will be directed to it. Jacobs did a drainage report for CIP. Daniel will be forwarding a copy for us to look at. Do you think that as long as the pond still functions this is okay? Or do you think we need HOA agreement /permission? Carol file: / /C: \Documents and Settings \ccotter \Local Settings \Temp \_agv0001 \text.htm 7/21/2010 Exhibit C • Dove Crossing Drainage Study Drainage Area Map Post - Development Conditions • • • �/ _ � , • � y ) � � � � ►� 1� 1�� �f �� .__ � � � l,. �� { �Z ° �t , ��� �' �:f!C�� � t�l, � ,.1�� TCit� '� � � � a.t� . I ♦� �� �. �� ��.� li � ►1Cr v�u %��� ♦ ���� 1'.11 � \� ;, 3 � State Highway � � � �� .�. �� ►11��E����� .rte ��CrC�11��CC��i.. ♦�!' =-� �---, .-� -- '+ ������ 1i/ ► ► /����� //s / V% r e e ��:�� \t/ 1�1`� , /►/ �1'��l!i� W �IIIIII /'�.1 ... co y � ��" � V� � J ,� d •� � ��� � �111111i ► 111 I � ..� a �.. � ..��.L, � �:: 1: ' � �' '' .1 �r•�1�eC�- �° .,a f.. �■.' ■..f f 9 .., f.■� lal, r IIli1l��' ,:. ����� � �1 , ~ i � '� �—' /fir � 1t rl ■�i. (� � � ,'�11 11' O 1' �� �■� r� � ■II I � ■ t; rIrlJ `.1� � �: � _ � ►a ��J ��j � '! ��� I ■/G o. 2 IS..�V y ► �e`� � �: E �rll� ` I I � I 1�111;��� =r�r,� �' _ �� �G'� L y � I�' ,� I W d �Y�.r� � � � �N rl ' �; ,. �I��r����i�i. • � � G G �• � � �� ■ ►V '.:. :� ��i {fir rl� � a • I ■. ■.v. i�lAl /1 �.,,. � Y'�, � � 6.74 Ac. 4 ����t� � � �) � � � C � � %Illf�� K1�9C111 : � �a1�� D.A. lE � L1 � i�,, _ � X11 ►� r'` � � � –It Ia � -.��iJ r���' �!� � �� _ i vim,. a r. r � i� � - _ ..►. � � �� .11' :'' � � �C �ttl S� ii is a�iii s� 1 ��r�fr�_ ___` ___ ., - - - -- �; ►e �I��1�,�IEII�r ����i1��, �� �� f.■r. ���rr� II`t �' %1 �!I �!►1 �,� �. ��� �A.�..��I�I ■: ��:�. ��_= Gi�llles. � . IIIIIy 1� � 111 I ,- D � �� - ` W i�vw' w rj= 11 V �.I. � ,p � �I�I�G �5�1 p. a-�1�� Q �� � EII �� (�� � p � � ��1�` � w d �� �� , : <E I �� /1�� r � y �'' IIi1G1 IA1 �1ri��� — � r�� iii �� _-� �.. - � ��.I• � : � � � �,�.. _._.J ,� c,���li � � i i �iri i � - -- � , � � j� �,� - ► ,� a - �3 � :• ° " ���'ll �� � "11111_•" `� I��GICI�Ct11C _�� _: � �Ii, �' c N o � � �� ��r� \���.�f■�_' -`i_ ��If�zS:�i�i►7 /��AG;1 C /i1111� � I' � �ii tr r . � -0 � � i� N ,� � ..... �— �'�.' i �`�� � �'�e��I1���1�C�;:.��.- 11�►�. _ , d �" w � . � � � •'� ie���71�71i �I� ���11111�11 � � q,� � '1 .1l1 – y tfi �, i, tJ tl � � � 1� rr. D.A. 4a �G��� r� - e�"� ,. � � �' � � n i.� J a 1 �� �I � �r r■i .■I� � i��' � � Imo( ( l�D� ��,. >��`�c � � . � �– - a� �i � ri e�i� , rl�� .f. �� 20.00 AC. �- iva � ��' S �_. a at ■1 � Ali r�z �, M ,...., u'�� 7.. N � � � � i�. u�. , r, �'t�tlG' .. �1 �'�; � ti>t � . � R , � r Q.b IIIIIi1�� w d ►�!.: !�r��� �� � ii ti i i iii � � ,�I♦ �,� -�,�+� L, L�� ��1 t1 i W ��r, � � � N � �� � , ■■� ra■►t, p � r■' r� 11� � ; �� ■I �I tJ Iffi ■ Ali few _..� . !w� r,�►� !!•I<►1 L \.`�� � . �1�� Ili ' r�7 ` I■■r� r � r��IV \��l ►Y ,1�'1.�� - f!; �[�L� '���• � (Jf /11�11� /l i I � ' � ►� 11 �{.7 r�l � 11 i�p.l L��� l�G. �1 ION /�', o� �:I � P� Iro ''�, \ /,'`■�J `�ls ' n 01 �1� � G �l �� X11 �-� �I� t1 t tti y� I ■I�) � �,� ���►'� �u���� r-�a� �.�►r s� ■ • _ �rIR ... �o,��� � _ _� »; ,�+r i ' � r �`J ��'� trl� % ' + � ■`. ��►aa r�ur �� w i ' w��r Jr� � � � � ,, , • �rii� 'la /'1� �'',i w'i � � t f �P �M 1111 11 ���rt� C� \� 1111' i� ►� 1 rt � � r _._.. ,_ �� ' —1 ljli'AZ J��1 /1� lli �, , �w_ \. r>�l� i�l%I �� '��1�� a! u � i , -� R7� �fL`[ P n�■ �e.f�� n■■ull'�� �����f _ ■.�� i � r �ti� ��[� t�I� f7id'1 r ►. �jj'' I .A ��r �[o' t � ■i f.�■■ r�.ri'i>. �, ii■i■ i��■■c ■■■■ '1 � ����J1� �����' r atl[� fv� � �I /� r/r� �ISV f �-+ I lU[L7 �� � ■■ emu■, ■■.fi n■ ■r iii ��� 7�� �i i :�rfaf(� - i� ►i r ��t� �� I�[a r 1 a■ .a■�.■.I� a �,��� ��. ���1��1'� � n - r■1 r� Ire �rr�l .�■ � 1>. rr Frl�� ■■ice 1► d • � c�� '� 111.■' f.� ■...f. �, � �■■ ..: �C i i � �,- � 1l1111 f sc■ ■�c/t wi■.r���t, i�l- f■.►�.ur� J � r[v �In f►�f.■ f.,.. � �>.i,�►■ �►.f■f► �f� 'ate t �, [�� I�l r.l� W � I � i �t �.ua�� ■.■■��.�■►�' � � �■. ►>•.tt ���r ��� II i� � �{ ' F,7r�.t► tia'(,t�G• � ��.; � u■ �.�r>.� �■r� � � ;� (F �. �■ r...■ r►r_' .,.f■. �r D1 �[D �j ' tii�.r f�� f �■.�� S: g ��� if r� �'� L I�i�G:�i[�,.tai4�►�lr;.a>!� ������� '_� _�1►a ` � � •,�- . , I,�, ■, Imo.■ �..,■f. p� q o _ d ' �� ....� ,f . I; � � ft��iiJ /�L����Gi� /E�L� �: 1/. , � _—+ � ,. _. � ,�u.l� r��lr� � . f :� ��� � :' % � [Y� rf� II � �I ���f���J ®G�! . t �� r � y�� (�� ►�� Sufi' I r� r��r,_.• -�-� �,,,., pi �. ►. I�,� ��r �I �'��Ad� �' ! �• f.....� Ir.l, .. �, .,.. f,..f. ,f., ., w�� v �1t� ia<� c��>t r��l• p U. `� ►� � ,T,,- �>f����ii��l � d II��. ■ ■.. ���,. sv �r �rri ir a.. r�i�t��r� i�ral ►s.� r!rl � � � 1 �..,.. r. ■■ fan bd .>. r �1� ��� 'L1 ��) 1L %�� '- i -..�1 rn �d' � , i ■I � . � .n rya■ c.■■ 1. 'v����!���ff� ..��� �4�� � 'ire rr�■■', [■�■i u�ra p J � �►w I�t^ L1u - �I /, � ���� '" Imo( >v .a �z■� �■■, ■■ �� r.a . ti 11(/, f�.l►- - � � � • a r r' j' � �>tl� n ' J ■.r re��� r�■' � !�, �i _ l � .� .•� :� f �� Q . � .�,�, �y��. � , r -� d ' Q .L� � ►.'■ iii =■' ■■ � ■� . � f[� fr �at� - �+�, N. ,�'� �I ra asp �fr�■■ �■ ■■ 1 � , � C� � _ - � 1 1" it r � i ' 1 [ � � + F� pp � SI 1/ y � f�� I /�I, ICI /J �I/ �� �� • ' ��' . ii I c r..v ..� �S - • � , ![1 � � � � :� 17 � � � � �• `r ► r � 1!111 ►.1111 , " � 1�� - .r.� -'� _ , +��. i �lrl ii`��i�` �:����i � ��'� '���k ��� as X1 /111/ � 1 � � � � ✓L11� ... � � ° �' �� r , t ��[>• ►.ra�e�t�a�.�'u � � `dJ'• cb b � a • � �� <n � �j� ' I 'r' i;al � �� ,<� ,law �u �[(.>,. ■[t /h�' .>h �. � � I� � I` �/ � pi �r�ta: `!�� �11[I �1 `l� Qy ITj t� �,� n P � �'�� °, �: ������ ,�h� � _-_ "� \1Y,,�� ►�`�`1�/�1�1+ �e!�!✓+� i � - ..����' c� wNCSnaanwve rr�i����C�C --�.� � o � � - . l / � � � III � r� � I ���) �- � I, Cr�� I I W [' ; �� �'1,��' � � �S� /hll F�f1�l %IC /'��IIII'11! °�° d �I I .�,! � b �[n: ������ LIflC� � � � !.! ��� `1./:I� /Di G�C�[I[�' /li�l'li��/ b y . o � � � � CIS irk �ll•��.r•) `'' y l � , '� %�],��1J�� ��- `� ,� _� � � f c��a - ���1111'1 LI[IIt��►� �_��r�� `° - A � o � � �� t��I ����C�� 0 ����]+_ � oo � ���' !l � ������� � r r r � � � � � `IBC\ 111���1 �± / o �� � ``�� � � /� ' �(►— =_ . _ `!�i -. � O �`` N N � � C-•• y p � �, ��� t � r � X 99 � � �� l r �� I � _ ��� � ° ' � \ _ ��' / � � a � - Q ma y" , : � � EXHIBIT C �rCn►aDev�or�nrr,La��r DOVE CROSSING DRAINAGE STUDY `"LLF��EPo�a�s�`"�`�a"`Es Q 2033 Harvey Mitchell Parkway South SOUTH FORK LICK CREEK DRAINAGE BASIN CollegeSfa6on m ... � POST - DEVELOPMENT DRAINAGE AREA MAP P.O. Box 11929, College Station, Texas 77842 COLLEGE STATION, TEXAS (979) 764 -7743 Fax (979) 764 -7759 Exhibit D • Dove Crossing Drainage Study Proposed Detention Pond • • • • 0 SVX31 `NOIIVIS 3`031100 NWL ,I , Z 69LL (6L6):xed £bLL-b9L(6L6) Janis NOILN3l30 ONISSONO 3Aoa w i x w a ° o w Z VOLL sexel 'uo6eLS 960 11 0 0 '6Z6 L L x08 ' 0'd .-'-'06-_-=.,-' i L 31V0 1Old OLOZ bL • i ,b9LL sexa 1 ' uo l L e LS 969 11 0 Nb'ld aNOd NOI1N3130 o w LI S w o m o i - 111>i - 111>i A9 03NOIS30 ylnog 6emoind 11ayoLlyv AemeH ££OZ w c N ioaN m0 - A8 NMV21O M3IA3d 2103 03fSSI 60 -90 - ZO V ...sovne-Nomono6.96o9evm Q 118IHX3 o F a m NMOHS SV 3TVOS NOI1dlelOS30 SNOISinS� 31V0 ON T� r� } <� �� *7 � (1 — , 1 1 [ y , � I ■ 1 y �f �I T Tr�i �' 1 , : 'rtr I i J i ' 1 i it \ 6/ O dy f IT ill t r \\ F,^ w 2 / 4 a.. \ ` CJ I ,/ 660 . \ , ti I I I I `. T III I I I i I T 11 11 1 I I 277 I \ .I Q I � ro I W I ' r , UJ 1 1 l .. cc r W l 0 ° w O a d o L b ■ I o a CC N a \ 278 z d. __ ', 1. ' a Y u a ■ T T I x z, 0 o J II N J 1 N 1 i N t id L N = 4 k o I t II '1' T' g` a ,T A' 1 Ar.' , t a :R iv, G� 8 � � , 6., I TS 5 Tv a N - ht w � 11 I p J J J m ao § � =a off 3 i I I 1 ' , j 01 ' tt7 r � n ,88 .m i �1 „_ eo" 2. I I , w T w u I � Maio ' s , @ sa , ) d I b Al andria 1 1,1 b y tI dl la m °z A d gw Avenue- 1 w� R C nvcrulc , 7 g z i F,, : b €°N gW n� a n ° S. l o §g :A$ a gA 6 Ag a � °° i w ° °a � e b I 3 1 W� 03 1 : a a 1 111 1 11110 Exhibit E • Dove Crossing Drainage Study Cross - Section Location Map (Exhibit 2 from Mitchell & Morgan Report • • Exhibit F • Dove Crossing Drainage Study HEC -RAS Unsteady Flow Analysis Output Data Report • • 4t 0 N N -+ 7 7 -- 00 00 cO .0 7 7 .- .- N N N N 00 00 OA ON VD 1 0 - .0 NN 77 NN MM 77 MM -- -- vl en MM NN VO '.O NN MM NN 0 C. O O O O O O O O O O O O O O O O O O O O O O O O O O O O W t '2 N v1 -- ON -- v1 v1 7 M vl N N N v1 e- vt V1 -- M M � ,N OH O N N 00 . el. On VD C O .-• r - � C VD [- N M V.') r- v ..o M 7 �+ o0 01 N 7 N N o0 0 o h O D \O l0 v1 vi -- G c,� O O 1 n n . N N M M 7 7 r- r- „„ .... .-.. CN Ch N n b VD 0' ON W 7M 0` M NC\ vlN 7VD r- VD vl r- r- Mt- 7vl 00 .-- r- C- NON 7-- �'.,N N -- c0 VON - 00 00N 07 ON Ch 00C- 00N 6M MON VD -+ -- 00 3 0'� vl N N 0"O :.:C"., v1 M7 v'1v1 OO NN v5 r-: N 0000 '.Or- 0'O' o n n , n n M7 O+ 0000 77 OHO+ 77 -- -- 6. 0, r- r- VD '.D NN O `- •■ NN MM NN NN 77 -- -- NN MM 77 M M with W U N � vt r v'M en en n !N 00 MM h- 6 en VD N rV Ch 00 v v 77 0 0 en r y N N 77 NN 7 7 ' V- vl v.1 NN sD MM MM t- MM vi vi MM > p , M en t - ON „ 00 N n M 7 LO ON vl VD 7 •-. N N et v'1 v1 v'1 . -. -� .-+ N M 7 O ,.. '.D N N 0 v1 ' ' 00 00 vt vl -- -- N vt O 7 7 0' 0' 00 -- 0\ C VD VD _ _ N N O _ l� [� N N cO \O v'1 v1 N N 7 7 N N 00 00 00 VD VD v1 V'1 V/ . .. 77 NN 77 MM 00 r- N. NN 0' 0 MM 0 0 O O O O O O O O O O O O O O O O 0 0 O O O O 0 O O O � � 5 O O O O O O O O O 0 O O O O O O O O O O O O O O O O O O y (11 O O O O O O O C O C 0 0 O O C O O O O O O O O O C O O O .-..r 0 77 NN NN 0O 7 00 N M 0000 �D �O M7 M7 ON CT w 7 7 7 7 O O 7 7 O O 00 0 0 7 7 -- . -+ O O O O V 7 N N O O 40 .46 .6 \D vD .O .O vi v1 v1 V1 7 7 7 4 7 7 7 7 7 7 M M M M M M V'• �0, 0' C ON O'D NN a O O D �D O O O Q a O O O O O O O O O N N N N N N N N N N N N N N N N N N N N N N N N N N Gi PTO v) 17 3 U � b O ' �� -� ^ '^� ?? V'1 vl N M en v) l� r-. �D �D 7 vl 7 7 �D l� N. r 0 41111% L w MM .-•. ,-. 0'0 VD NN 0000 r- r- 01 Oh O�O� ON 77 MM CD CD OTT cd� W ' 3 N N N N N N N N N N N N N N N N N N N ch cr. ON ON Ch Ch CN Ch CT CN N N N N N N N N N a w v1 vl m M 7 7 0'. OA M M ON 0' v1 v1 ON D\ 6 O� [� r- M M N N N N - '.D '.0 VD VD VD VD O O VD VD .- •... en O. 00 °° O O O O t` C.... O O 6 O� O O El U v O O O O 0\ O� 00 00 00 W 00 00 N t- N n � � � v, v1 vi vi, O'. ON 01 0'. 00 00 00 00 00 00 00 00 00 00 a0 00 00 00 00 00 00 00 00 00 00 00 00 00 N N N N N N N N N N N N N N N N N N N N N N N N N N N N W WI ime 00 OA M '.0 00 � -- 7 7 N en M 00 0 -. s.0 Oh l- •-• .-. 00 M M N 7 00 N N 00 YO y \D 0, 7 r r-- M ■\D -- v1 n .- \D 0 M 0 en 00 M 00 M v) -- -- 1 0 E.., U N N .6 gg O - 00 O+ 7 .D 00 O r- 00 M g M g 0'. -- O N M vi 7 v1 .� , .O VD VD VD 00 •- N N 7 V v1 '-0 00 00 01 0 ON O O -- N N M M a , .0 , .0 b VC '.0 n r- n n n n n n n n r- (..) er n t- 00 00 00 00 00 00 00 1:4 O O O O O O O O 0 0 O O O O O O O O O O O O O O O O O O 0 O 0 0 O O 0 0 O O 0 0 O O O O 0 0 0 0 O O O O O O O O O. .y a . y n. :1'1 a . 0 n. .y a y a y a a y a y a y a o a y a y a X .O X .O X y 0 X 0 X O0 X O 0 X O . X 0 • 0 ' � O • O0 •X O 'X 0 • Oc wa w wa wa w wa wa. wa 04 0. w a ww wa wa wa v) 00 cn cn cn cn v] cn cdo v) Cip v1 v) V) U1 v) v) V) 00 (1) v) v) v) v) (n v) w 33 33 33 33 33 33 33 33 33 �- 3 33 33 33 33 U 0 0 "' 00 00 N N O O �. d 00 00 v1 v1 m 7 00 00 N N V - r- n n 0'. CT n n 00 00 c/D ... 7 '.O '.D O' O6 VD VD 00 00 0'. T O: OT NN NN . .7.• NN \D e er �D y 00 00 '.D '.D 7 7 ,Y„:?: _M ,71.:, vl N vi �. v1 vl 00 00 vi V1 0' 01 r- r > VD '.O LD VD v'1 v1 M M N N -- O O 00 00 .-- .- `D '.D N N vl v1 CG 2 O O O O O O O O © © O O O O 0'. 0 A 0 0 0 0 7 0 0 0 0 ON N S N CT ON v 1 c n 2 .. .. .. 2 . - .. O' 0'. 0'. 0' et O'. 0'. ON O'. 0'. ON CT ON O'. 0+ 0'. .0 .D - - .0 .L". .0 .0 - ..0 .0 - -IC .O - 4= .0 .0 .0 .0.0 L S .0 .L -C t L .0 O c0 c c c e cc c c cc0 cc' c c eel c 01 c eel 0:1 m c c eel c eel (00 N e el ( .0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 R4 FG g g c4 D: OG GC a4 c4 GL a4 c4 CG C: CG CG OG CG LYE c4 CL a4 C4 CL ce CG ce ce 0 .. L L. L. L L. 1.. L. L. L. • O~ a 4) 0 0 0 0 0 0 0 C) 0 0 0 0 4) Q) 4 L. ) 0 0 7) 0 N G) Cl) 0 0 4) 0 CO o a s a s a s a s a s a s a s a s a a s a s a Cu a s a s as as as as as CL CL as CC. 0. CU Cu as 0.0. as a a. as 4t • V1 N v vl [� l� M T T '1 N N 0 0 `O T T 44) 4D �D �D T T VD VD t- r- 7 r N l N '.0 '.D et M et M M V M M M M N 0 N 0 �D M M 4D ^• M M .--, O V O O 0 0 O O O O O O O O O O O O O O O O O O O O O O O O w 72 N v1 vt Vl 'D v1 'D et �A N T M M vl N T MT �D .-•• [� 00 i- T N M et v1 .. N vl vl T •-• ...i �? 00 r t- vl v1 N N eTT v MM CD 0 u0 uD qD NN TT T g NM MM O `-' N N 0000 et et TT 0000 T et el •r— .rN N'v1 N . T � 00 TT �-.— N N .. -. -. .-■ •--∎ -- N N N N N N N -. — — ---- N N O 'D 00 T VD N N et ("V VD , N N et T VD M 00 v1 t - 4D - '.D v1 4D Vl M vl Q' Oz et M 00 .- -. vl N 00 00 M t- CO \D N 00 M r- M v1 00 01 O N et 3 cot M 06 T v1 u-; vl vj O = T T t` t- et et T O N ‘46 N 0-; M T T 0 v v1 v1 00 00 -. -- N N M 00 00 00 00 --- b N N N co O T T F. r O O '7 yr -- M M yr yr M M v1 vl vl vl \D vl v1 V et M M rn M W R' L to rn t- r- r -i et et ' vl h '0 M M 00 00 T co r- t v1 vi C) ; M M et et d. N N l∎ [- vl vl et yr 4D 4 4O 4D N N M M t� l-- v1 vl M rn 7 ,_, M M 00 00 vl vl v1 et et et 'd' M M 4 4 N N N N N N N N et 4 N N a y1 .en M 4 vl t VD t - 00 VD 00 Co t` 00 T M M 00 00 M M M t- et vl p M 7• r 8 8 vl vl t t \D t- t N N _ 00 00 00 00 N _ N 00 00 T T � 0 MM 00 00 l 00 TT 0 0 0 0 0 vl v1 In 0 -. - v1 v1 et et M M N N O — .-+ 0 0 0 0 0 0 0 0 M M 0 0 a O O O O O O O O O O O O 0 O O O O O O O O O O O WI () O O O O O O O O O 0 0 O 0 0 O O O O O O 0 O 0 0 O 0 • 00 U.i O O O O O O O O O O O O O O O O O O O O O O C O O O O O I� n 00 T N N M M M T T r- 00 t- r- T T N N CO 00 vD VD w 00 00 Er) Er, - ' -- v1 vt N N O O OD �' et T O+ T T 00 . �'N NN �.. ... 6 6 CD CD T� TT �� TT TT 0000 0000 0000 T T T T T T T T T T T T OD 00 00 00 00 DD 00 00 00 00 00 00 00 00 00 00 N N N N N N N N N N N N N N N N N N N N N N N N N N N N o w r r 0 3 LL . : © v t > N r N 00 00 T T M ' et � et et v1 'D N N N M 00 00 t- 00 M M N N N CA L w r- r- t- t- 00 00 M M O O CO 00 t".•• t- v1 f0 et �' M M 00 00 t- t- .11 v1 c Q 4 NN 0 O 6 6 TT TT TT T TT TT 0000 0000 0000 a X 4t 0 T T T T T T T T T T 00 00 00 00 00 00 N 00 N N o0 00 00 00 00 DD o0 DD W It ] N N N N N N N N N N N N N N N N N N N N N N N N N w 4D '.D 4D N N 4D '.D v1 v1 T T 4) VD N N DD DO 00 DD N N �•• •-• N N T T 00 00 N N O O O O et et vl ut Oh D\ VD lD N N r- r N N M M U + ul vl N N M M M M N N M M M M N N N N 00 .-r N N N N E [ '-' 00 0 g5 0 00 00 00 00 00 ',it?, 00 0 0 00 00 00 0 0 00 00 00 00 L N N N N N N N N N N N N N N N N N N N N N 00 00 00 00 00 CO N N N N N N Gn cd T T et t- o0 et 00 t vl vl 4 V vl et N 00 4 oo et V1 t v1 00 r . ... ^ N00 v1 -. Ml- Ml- Mt` v1T NOD C - CD �[ - D,� � D\ N 1-- T DDO ' n l' 00 c4 In � �� N VDVD VDVD bVD VDVD VD VD VDVD 0000 �� ,°,9, � 0 v1 � hin 7 0 a o0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 O0 O' 0 O' () CN O' O0 00 0 Oh 1/^Y 0 C 0 0 O O 0 O 0 0 0 0 O 0 O CO 0 0 0 0 O O O O O O O O 0 0 O O O O O O O O O O O co O O O O 0 0 0 0 0 0 O O 0 O — _ a N a En a En a fn 0 _ a En Cu. En 0. _ 0. a v, 0. _ a En a a X . O .X O .X 2 .K 0 .X 0 .X D • 0 .X 0 .x O - O .x 0 .X 0 .K 0 L. • x 0 L. wa wa wa wa wa wa w wa w wa wa wa wa wa ^, 00 00 In In �00 00 00 00 00 In (n In In on Do on on on on on n Do up v, In In co 33 33 33 33 33 33 33 33 33 33 33 g 33 33 33 b g g g 0 0. 0 cz `' [- r- T T et V rn M t- t et et 00 00 45 T Cr) M M t r- M M a N NI eV cdo vt vl N N T T VD VD � r h t` er et o0 00 et yr O O N N -. -. vl h c. 4 4 N N 4 yi M M r-; r-4 N N t4 t4 M M vO vD r+ -+ r , ,-A. , v O O U ^" -- 7C' NN NN r- r- 00 00 TT vl v1 TT 0000 .... - �lD et '0 M M 0 O T T 00 00 t� r - VD 4 D vt vl et et et et T 4 et M M VD T T T T T T T T 00 00 00 00 00 00 00 00 00 00 00 00 00 00 7 00 00 00 00 00 00 00 SS .0L .044 .0.0 .L".0 .0L .0.0 4.0 44 44 .0.0 ..'.0 .0 .4.4 .04 44 44 U U 0U 0 0 0 0 0 U 0 0 0 U 0 0 0 0 U 0 0 0 0 0 U 0 U 0 0 • .0 0 0 0 0 0 N 0 el cd cd O ctl 0) 61 el 0 0 0 0 A O O cC cd O O 0 ed cd O ) al 00 cC O 61 0) 0 et O 00 N 0 00 d 0 0 0 00 0 00 00 0 0 00 N 00 6) 00 U c4 c4 004 CL 0.'+ 004 C4 D: c4 CL c4 004 CG D~ CL a4 c4 00 a4 CG CG c a4 004 004 a4 cL c4 a h N L 4. i.n Y V S. L Ir Ir I.. N 4 V V V V I.n Ir -i 2 N 2 N N N N N N N U N N U N N N N U U 0. 0 a s Cl. 8. . a s 00 0 O 0. . D. a a s a s as a a s U a N a s a s a s a s a s a s a s a s a s a s a s a s a s a s a a s a s a s • • M P vl vl 01 01 0i 0\ vl vl N N n t \ 01 •-- -• M vl S vl 01 vl g M et :5 M M M M N N M M N N N N N N M N N O+ 00 • M M -+ O .-. O N -r N C V O O O O 0 0 O O 0 0 O O O O O O O O O O O O O O O O O O O O W 'O c N 00 vl .-• 00 M M [- VD N- [- vl VD .-r 00 M 60 O .•- eh of N-• O� C- 00 M01 OM 00 et N et n0 0 VD v1 v1 vl vl p �� d•. MM --••4 NN r- M 00; MN r - ooh O v0 v1 Nn G v n M r- M M vl v1 M N M M --• O -. -. et M 60 N N VD N N N N N N N M et et M M N M M M M M M M M es) •--� --� N N E"' 6. [� n et N 00 --• r- V0 0. 4 vl 0' M 00 N N N 00 Q , n 00 „ 00 01 M 00 M n 00 N r, pt - M l�O t� l0 D\ 00 n et M.-• [� MN _ �N O�oO 01 DO D, aO 01N 0- O O 00 00 N � - ' O vl l- '41." V 1 0 l � l - tD O �D - M N O 01 4 4 C'4 � 00 r - vl vl l e- N e- N 0 01 N 0 N \D \D vn N O� O � v'i vl � �0 [� t` VD l0 t` n !` r N. r- M M M M 00 00 vn vn [� l� l- [- n to vl v1 Lc. C - - „ 0000 01 vl t- M et e. el et r N de 60 et 60 4 c�N 0\N U 0. 01 O • N N O O et yr N N '11 v1 00 00 eY eF 0 of v vl 01 Vl CA v1 v? et. w. 15 M M et M M eY er M M M M N N M M M on •-r M M we O -. O .. N we N O 4 N N VD M N e. VD e. M et N 00 M et 00 et v1 \0 N et N et N 00 et vl O NM N et Mvl 1;2, 0' 0' 000 0' 00 �v1 00 c� 00 l- Nof 4 00 O v1 N 00 00 O O O O O O M 00 00 N M V l -” 00 yr 00 0l O O N CD eY • N NN NN NN NN ^+ -••• 0 0 NN C0 CD 00 00 00 0 O e. 0 0 O O O O O O O O O O O O O O 0 0 O O 0 O O O O 0 O O O O . � (7 O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O co Gil O 0 O O 0 0 O O O O O O O O O O O O O O O O O O O O O O O O 4 0 00 0\ 00 00 N N 00 00 C c M M N VD 00 t0 N v1 Ol (- l0 N '. lD 1 N 00 w M M 0 00 �0 �0 � � co co DD 00 I t-- e- e-- r tI'1 eY N 00 � 00 VD VD 00 t0 t � ()' QZ o0 o0 00 00 t-Z r-: n n n n vi .6 v6 u6 b l0 lD tD vi of et et eY er et 4 et et et 00 00 N N 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 N 00 00 00 00 00 00 00 N O N N N N N N N N N N N N N N N N N N N N N N N N N N r � vi i7a N .0 3 als M at M LL 2 00 3 N in O U • i > M VD V0 00 00 -+ .. 01 01 01 01 00 N l- r- et M 01 00 0N et M M et v1 vl N M M M 0 L w N N 00 00 VD \D N N 01 01 c- c- 4D '.D vl vl M M M N t- b o0 60 00 60 00 vl c- VD 00 d dZ 06 o0 n n n C` N t` v5 ' v5 uS u6 .6 l0 vS O .6 M M et et et et et et et C et et 0 6 (n ‘ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 W - N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N U L . ,�MM M M o000 00 NN NN NN NN NN 00 00 CA U 0 0 . 0000 D\ N �-+ N N 00N 0000 00 00 00O 00 00 l� N t� 0000 0000 a000 r- r- C 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 l� n r- r- N N N N N N N N L. N N N N N N N N N N N N N N N N N N N N N N W Git .4 et M WI et 00 et v1 l0 VD 00 M 00 VD sir:. .. et vl - ;j ' N M vl i/•1 t` 00 00 VD VD O 0+ 4 N O VD vt -. d• . N 0: O 01 r- D1 „ es O p • 0 c . 0 t ` 0 0 et yl et vl � c•• 01 0 _ -' - N _ M N N •"' •"+ OO Vi yr ,, 0 n c° O i °° c '' ' • l c- y O, 't NN NN rqN N N N N NN NN N .~^' -' O O O CN O O O O O O O 0 O O O O O O 0 O O 0 O 0 O 0 O 0 O 0 O 0 0 0 O O 0 0 O O O O O O 0 0 O O O 0 O 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ^.ee .. „ .. „ ~ „ ~ „ ~ „ ~ „ I I � I I I � I ~ „ „ „ ~ „ I � I I I I ~ „ ~ „ .. „ ~ „ ~ „ I I I I I I I I ry En a in a . a y a 4 a 4 a ^ a y a c0 Q. 0) a a a a _ 0. 'i% a •X O .X O • O • 1. • X O . X O • O • O .X O .X 0 .X 0 .X 0 •X 0 •X 0 •X O r. wa wa w wa wo. v..) 0., wow t.7.7 O. w wa wa wa wa w a wa coo (n CA CID Cn V) (n CA CA GO CA CA COO CA GO CA on C/) on on cn V) [n fn Vi COO fn (n 0 CA w 33 33 33 33 33 33 33 33 33 33 33 33 33 33 33 a ct f n N N in in 0 0 VI '^ M M VD VD 0' 01 et es N N r-- N as 0, 0 7 N N N M M 4 et M M M M 4 ct; O N N 0 N 0 [ r- c- t- VD VD 01 01 00 00 0' 0l O O r CN 00 00 N N N N vl vl et 0' 0, r- r- .o VD et et N N <7 c> on 0, — VD VD VD VD VD VD VD VD 0000 CD C "' .1. ' Q! h n r - N N r r t - !` [� [te n , .0 v.) � � VD VD 4D VD -.0 .0 .4 .0 .D .0.0 40 40 .0-0 .0 J'. .0.0 t0 .0.0 .0X -. ". ....-.. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 • 0Y 0 e0. ad 07 cd cd 0i cd ca! cal 00 td td cal cd 0] 07 cd 0Y 07 07 w L. cd w c :d W C. ........ .0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 +' �' w a4 04 fL' CY CG 04 CG LY LY CG 04 CL CG 04 CG Cl CG CG 0 0 0 0 0 0 0 0 co H 1. L. 0) it 4 N it Ir L i. H i. i. Y 4J N 4. 4. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 X X X X X X 0 ) X • a a as as as a s as as as as ac. .1 .12 .12 .12 .12 12 12 12 as as as as as as as as as a.a. as D� �D �5 �: �� D: D � :� �D �D �� d Q <4 <4 ¢Q ¢ qt 0 et M on M Co N .-' CO 0h 0+ Oh N N M N 00 N 00 r- v1 00 vt VD et on • 'fl S '.D 'n '.O vt me M M M N N N N et et et et Co — CO — M .r — — O O — of vn O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O El U .0 70 \O N VD VD 00 00 — r- ,� — v1 CN M 00 N 3 '-: O M O N ao v . v, N � � � er �� er O VD 7 00 , Do mm v1 et O. v1 00 O t` O n O D\ ul • v1 ' vi .�-• t` VD ' � 0' p, " N t` ON Z,..., t` O N O VD V) VD N M et et M eh M • V M et et 'n O M N N N N N N r4 N N N N N N N N E • O' — n 00 C- N r- VO N — M on vl 01 M VD VD on CC Co et -• 00 00 Co r- -. of 'O Co — Co CO et N O O, O O0' et O, 00 M N Oo c, O M 3 < mr v1 - et M O on M t- H r- V'1 V) M VD O N '45 N \O "" l0 C C et M 00 o et et et et et vl v1 VD VD VD VO et et et et t` 00 t` 00 b 0+ — N N O\ on et W C •C '0 ■4:, N 0'. 01 N N 00 M 00 M et et 00 01 on N on N V) r- ,,ro r` N N v1 on U VD et r-.. eh — O et VD '.O D 'D 0 0 0 0 — v1 — vl '.O M '.O N 'O 4.1 00 N y vD v VD of et et M M M M M M et et et et O — C N — — — CO CO — of -' p '.0 on et 00 Co -+ VD M N n 01 0_0 00 eh M et M et N 01 v1 n N N O r- 00 OD — 00 VD N M M M M VD O. 01 et Co N co N et et M M M .. r- N— co t-- --• 00 -' 0 et et O'. ON O'. ON et VD V0 00 O M OM y1 N M N O 0 N et 0 U7 et N et N et et N N et et er et C> O O O O O O O O CO 'D VD • o, 00 00 00 00 00 00 00 00 00 00 00 0 O 0 O 00 , U , - , co CD O O Co O CO O CO O O CO 0 0 0 Co O CO CO O O CO 0 0 O CO O 0 O C71 O C O O O O O O 0 0 O O O O C O O O O C 0 0 O 0 O O O O O et M OO to mt r- to — 0D Co 00 CD 0` 00 00 M N ,_, L4 — O. — Co M .••, r v1 et V1 et N O o. O M Co M O� 00 O 00 00 00 Co N 4r vi '-' 00 00 Oo OO 00 et et et M M M M M t+l M M M [+1 M N M N M N M N N N M M M C7 0o N o0 N N 00 00 00 00 00 00 00 00 00 00 00 00 CC 00 00 00 00 00 00 00 00 O N N N N N N N N N N N N N N N N N N N N N N N N N N Irl v? OCI U � M M N N on V 1 VD [- on v1 v) v) 00 00 VD M t` M !` 0\ '11 on VD '.D 00 00 VD t (/) (_,, n '.O r- O CO v1 et et M et M M 00 0'. 00 00 00 0' 00 O 00 00 00 0'. 01 00 0., ol a 00 • V) 00 0 0 00 0 000 00 00 O O O O N O O ONO OD ONO 00 O co N O 00 00 O O O co N O W N N N N N N N N N N N N N N N N N N N N N N N N N N N N w VD VD '0 VD et et NN .--• MM MM — — U N N N N N N CO Co Co 0� 01 VD VD b 'r? v1 t4 t4 r4 t` v1 vi V1 v1 vi v1 v1 vi v-; v-; l l v1 vl 00 r- 00 t. n 00 r- 00 v) v1 00 \D rN N N N N N C ..... r- n r- r- t` n ` r- t r- r- n t- r- N r- N N N N N N N N N N N N N •- N N N N N N N N N N 4 7.4 Gn *a M — N N � ' 'D N N 00 00 et r- N r � y O 0' O 0'. 00 \D 1p in v1 et M M M M et M et M C CJ -. � M 00 O 4., 0 r4 �D [-4 vl v1 vi et et , 7 O n O t: N '4 3 N N N „,. r et M dt F"' U et et et et e t r- et r- ....vi t` et n et VD et '.O O M co M M N M . — — — a V O Mr O M -' N ., M -' N.' M N r M N -i M •• N + M • N ' .r — .- -- .--. .N-' .• ._-' . — a 0 0 0 0 O CO O O O O 0 Co Co co CO O O O 0 0 O O co co O O O O O 0 0 0 0 0 0 0 0 0 0 0 0 00 00 00 00 0 0 66 O 0 0 0 0 g 7,1 --' 1 - 21 --' 1 -' — ' — I --Y-'I -'I'-'I 7 —I -' --. .-" 7,1 "' -'I —I -'1 . -',-'I Or O •= 0 O .N 0 .-N, .N O -. -F' O •- O O •y O O O •N •- al CC al CC al CC I F . O . O • O • X „ L 0: Wa w 4 el wa wa e,1 CZ: a. 0: ) O X w0. w0, •- w wa Con C&D up up on C.6 CIO COO CI] VD CVD 000 U0 GO 07 GO U0 U0 V) GO Co0 GO Ul V) U0 E 33 33 33 33 33 3.3 33 33 33 33 33 33 3 3 3 33 ct Ch CN V) 00 00 v1 v1 0'. 0'. N N --+ 0 0 0 0 VD VO M M �D �O VD v M 01 01 •' ^' -- O O N N VD V O V O VD e t M M O O -- [ V '0 or) o0 et et CNN 0000 '0 'O M O N N 0 'O OO OO OO . N -- N on v) > vD VD oD vD VD vD VD �D vD VD VD VD vO VD �D V, N N N N ...4* 00 LLB at cd cd cd cd cd di cd cd at c ' • ' - ' d 0 0 0 C 0 0 O O O b b b b b b - - 4 ' - - - 4., 4 ..' e ,., c.. - C C C C C C C C C - C C C C C C C C C 7 7 7= = 7 ' 7 ct s 0: 0: n. a°. 0 z 0 z a a 2 z a°. 0 0 0: O O O O O O O O O O O 0 0 41) c H y vi ti vi v) vi yr cn y vi cc) v) y y ti 00 d0 bD 00 bD OD by bfJ by OD bA CG C: C0 v, 0) v, v, 0) 0) y VI y vJ 0) y vJ (0 ur C C C C C C C C C C C r. �. • 0 0 0 0 0 0 0 0 O O O O O o O X X X X XX XX X X X 3 3 U U U U U 0 0 0 0 0 0 0 0 0 0 o 0 0 0 0 0 0 0 0 0 0 0 0 QQ ¢¢ ¢ Qd dQ QQ Q6 ¢¢ o > 0 0 0 0 0 0 0 > O > > J. Ca0 00 00 00 0 0 0 U 7 vt ut 1-7:71 7 'D N N N N N N 7 vl 00 N Ol [ � vl wt b S 7 7 N N N N N 7 7 N Q Ol N - ..r M M 7 7 M M N N ^' N M M 7 7 • V O O O O O 0 0 O O 0 0 O O O O O O O O O O O O O O O O O O W .0 -0 h 7 Vt co 00 M M oo et M r- 00 .- Vl t- t- 00 vo r 7 Cl 00 00 - VD 0- t- --, M 00 \D 7 7 -. N M O vo " C1 N C 00 ... "� r 00 Cl M vl t- v "" 00 70 OON t�O vlN "'N Og . t� v i0; �l0 ON o6 r-- O N vl „ rn N 00 00 7 eh t- F- M 7 r- 6 M O N t∎ 7 10.- l0 N t-- t-- N N N N M N N N N N N M M M M M N N N N N N N N F"' C N 0 00 h N '0 N N M �0 vt tr.' M °° 00 N Cl �0 w " Cl N 00 Ch Cl t Vl t- VD C N vl 00 t - 00 Ol .ii �0 O -r �' N N N •-� t� N N N V0 • _ c7 • • 0 7 • O� •--� V1 7 01 .. v1 • N '.O l - t- M • N O M vl P.S. <r; 7 7 O O ., vl N .r 00 O t - 0\ 7 . fi r [� -6 Cl 7 Ol 7 N '.0 C\ 00 00 t ' vl p 7 0l 00 00 00 t- V0 VD vl 00 00 . .- 00 00 VD VD VD VD 00 r- O 7 N N N N W O -C N vl r- 00 M 00 -. vl N M -+ cD 0 CA r- -•. .-+ 7 00 M 7 r- VD N r- r 00 t- 7 c) --• co M M 00 00 \O Vl co O Cl oo oo t- .0 vl t- '.0 .-•- — 7 .0 N vl Cl 00 VD v6 46 vl vi M M N N M M VD VD N N N N 7 7 v1 vl Vl v1 7 7 M 7 vl vl q N •--- 00 00 vl N M Ch t- 7 N t- N 00 N 00 M N vl 00 VD Cl p 7 0l N t- -- 00 7 00 00 ,, 7 M VD -r Cl VD O 00 N ,D C vl 00 -. N N VD 7 7 MM MN Vl7 7 O 0000 M7 NN vl M O 7 7 VD VI • ' -' 7 7 V 1 --� O O N N 7 7 N N N N O O O O O O a 0 0 O O O O O O O O O O O O O O O O O O O O O O 0 O O O co c 5 X00 CD C> CD CD CD CD CD CD . CD CD CC CC 00 CD CC O CD . CC O CD CC CD CD an C4 O O O O O O O O O O O 0 O O O 0 0 O O O O 0 O O 0 O 0 O nr - 00 t- M Cl t 7 \0 N Cl 7 CN 7 7 Cl Cl N -- Cl t- N 7 l- w vD 7 Cl t■ VD 7 7 M Cl 00 N -r CD Cl t` v1 Cl 00 v) M N Cl O Cl N N N cV tV •-• -: "^ ^. O O 6 O co Cl O, Q` ; n ` 00 00 P t- r- .6 `D 00 00 00 00 00 00 00 00 00 00 00 00 00 t r- r- r- s r N n v6 t- r r- t-- n r t- N N N N N N N N N N N N N N N N N N N N N N N N N N N o w n WO (n os 3 - U +' b O ' > v, w N l� 7 N 00 7 1 7 M M N t N D\ 7 7 N r- N -. c0 7 vl 00 t- 00 vl - 00 0 p -. 00 c0 v - VD -. O O O O VD 7 00 l0 N 00 r - '0 r- vt vi c0 �/ � CC N •--. •--- -. .� „ 0 0 0 0 O Ol Cl 00 00 t- t - t- '.0 N l0 l0 '.f v1 u-; a. ^ N N N N N N N N N N N N N N N N N N N N N N N N N N N N W , 3 w "r — t` n 7 7 — -. 00 00 M M t- t- 00 00 S `.0 Vl In vl v1 M M 4'1 0n .0 l0 00 00 4' 1 W I N N Cl 0l t` N C1 Cl 7 7 U 4-. v1 v1 [� t- t- r- l- t- M M M M - . - 00 00 r-: l� N N t� r-:. C `-'r-. t- NN NN NN S r- r- c-- tit- r r r- r- l0 VD O VD VD b \p VD O N N N N N N N N N N N N N N N N N N N N N N c1-1 an . VI ON M M vl Vl CI CI 00 7 OM 00 N of It CD t VD CI M O c 0s 0 b 0 0 VD D w M N N C` O co; 0; 00 00 00 7 00 Cl v0 vi 4 M O .6 --.. 7 N M O M O > M O Lin F U .. M N O 00 Cl 00 Cl 00 N Cl 7 M VD V0 Cr, VD O M O M O M O M a , - , v1 7 vl 7 VD 7 vl 7 v1 7 V0 7 VD 7 0 V0 vl vD v1 V0 - t - VD t- � t- VD U t VD O O O O O 0 O O 0 O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O 0 O O O O O O O O O p O O p g -. 1 -. I - ..'".I --'1'-'1 -.1-'1 .--'1'-'1 '-'1.-'1 ~1- -. '-' -" I - 1 '-' :I :1-1 � 1 W d w a LI u.1 x y x y x y x x k L x x x x y x 0. a ell 4: XI d: al 8: ww w a wa dl a: '11 4: al d: L.11 CL 0000 0000 VD V) son VD V) VD tn 0000 0000 0000 COD VD 00 00 VD VD 00 00 00 c:: 33 33 33 33 3 33 33 33 33 33 33 33 33 33 a COD MM NN VD VD 10 '.D VD VD \O VD 10 VD VD VO VD 10 VD ID --• -••+ VD VD NN 77 y ^ -. O O O O 00 00 M M - m. C+ Cl VD VD Cl Cl 7 7 v1 vl ON Ol 00 00 N N U 00 00 VD VD M M •--- -. O O ON Cl r- t� Vl vl N N 00 00 VD VD v1 v1 vl vl vl V1 vl vl v1 vl Vl vl v1 vl vl vl 7 7 7 7 7 7 7 7 M M M M M M M M M M M CG v1 WI M .0 .0 -0 ..0 -0 ..0 - 4C .0 4 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 - .0 - .0.L 0 0 U 0 U 0 0 U U U U U 0 0 U 0 00 00 0 U 0 0 0 0 0 0 0 C c 0 M M M C 0 0 0 0 C c0 c0 C C 0 c0 0 C C 01 0 c0 00 0 C 0Y 07 0 • U 0 0) 0) 0) 00 U 0) 0) U 0) 0) U 0) O) U 0) U 0) 0) U U 0) 0) 0) 0) U 0) 0) P: CG CL CG CL fY CG o4 c4 a4 C4i o4 c4 0: o4 C4i cid a4 a4 c4 c4 o4 a4 c4 c4 c4 c4 Rai c4 L L L y y y y y L y y L L y L L y L L L y L L 0 0 0 0 0 0 0 0 0 0 0 0 0 3 3 3 0 0 3 3 3 3 3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 as a..a - ..a a..a a - as as as a .a a,.a a..a ._)._) ..)a a ..._,..a .0 N N N N ;71 N N N . r N N 0 o 0 0 0 O V O O O O O O O O O O O O 0 0 ti: O 6 O O ,O N h 4 N M b N u , 00 N 0 vl N c- vt n 00 M O .-. ON �O C. oo O 0 oo M0 v im ri • N N NN CD CD d. V O M M on M (O N N M m 0 M M on M mr 7 VD VD 4.1 e ' l VI VI rq < c . - on n N O • v1 oo V `r? N O , 000 � V:, M 0 O' y o � 00 r- v Kl 0�0 � o o a 4 v..: o 0 0 O OsO c.o. 00 nn -.rn NOCN 44 44 N N 0. A '� N N M vl 00 4 vl Vl vl n vl 4 4) V) N N U � O, �O vl N.-• N--• NomN.- NN N N _ _ 7 N N pr.; M of ef' M M N N eh 0 0 0 0 > N M M b r o\ 00 er 00 M M v-• V1 v) O. O vl Owl N NC"- M7,7! TC" CD 00 M 00 _ N_ vi O\ 00 M M O O O O "' 0 0 0 0 O� 00 OO 00 0 0 O O O O O O O O O O O 0 0 �Oa d O O O O O O O O O O O O O O O 0 G F).1 0 O 0 0 O O O O 0 0 O O O O O O . , O, M N l� t M -+ o, 0000 h . W 00 Oo 1 MN 00 �� �� vi vi C7 •..i S N � n n n vi wi vi n n s n vi vi N n n n N N N N O N NN NN NN NN NN NN ;TO b 3 , r-n 0 .. " r LL . U N N O VD ' > v1 9i .. ■N 7 ■ Vl 00 VI VD vl ..r) 01 0\ t" W `p ON O\ vl vt N N 0 0 00 00 et N W V N N N N N N N N N N N N N N N N N N °' OR U W vO VD M M 00 00 M M v) vl 00 00 el eh - V1 vl ->r M M O O VD VD VD VD D\ 0' I I VD VD VD VD VO VD 1 V a m n n � .5 vi vi ' N MM 6 0 NN C N N N N N N N N N N N N N N N N N 0 w tin M l� 0 CO 00 cr.=-4 ^• 0. '-O M u ;d N O 00 0, O� 00 l� 00 M en v1 N y � n 0 o wMO c-40.; -- viol r4m Oi0 No0 > ce F " U 0M O N e. M N 0N n 00 M 0' 01 0000 0000 Cr, O O O O O O O O O O 0 0 O O O 0 O O O O O O 0 0 0 0 0 0 0 0 0 0 0 0 0 co, �I�I �I�I r l�l r l I �I�I I �I�I �I�I I 0.. . n• .. a' . . a . . 0. y O. y 0. y 0. m d m a. .0 0 0. [ w p j a X X 2 X B k 2 X x W0. W0. L) 0 W0. WQ. Wa up up up up up up 00 CIO GO CD COO Cr) CC CC w 33 33 33 33 33 33 33 33 33 Egg gg gg gg gg gg gg gg gg el v) M M \D \O \D , .O \D ‘.O \D c0 \D \D VD VD VD 4) 4 ) O O mr M M CI, 00 — 00 00 00 V1 vl vl vl — — Cr, 0 nn rn 0 > M M M M M M M M N N N N N N N N N N C . M N _0 .L -G JD t JD .D .t: S .D 4= .0 .= ..0 .r 4= JD r 1. 00 U0 0 U 0 U 0 0 U 0 U 0 U 0 U U U cd cd cd O cd o O cd d3 cd O cd cd 0 cd O cd 0.1 cd .4 U 0 0 4) U 7) 0 4) 0 G) U 0 0 C) 0) 0 4) N G) 0 u 04 04 04 c4 a4 e4 C4 e4 04 e4 e4 e4 e4 a4 a4 c4 a4 c4 c4 ct L L L L L L L L L 6.6. L L L L l-. L L 3 3 3 3 3 3 3 3 3 3 0 3 0 0 3 3 3 3 3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 . a •a .a .a as as .4a W../ a - - .aa Appendix 1 • Dove Crossing Drainage Study 9 Y Detention Pond Analysis Mitchell & Morgan Engineers & Constructors • • • DOVE CROSSING SUBDIVISION DETENTION POND ANALYSIS February 2009 Prepared for: CIVIL DEVELOPMENT, LTD 2033 HARVEY MITCHELL PARKWAY SOUTH COLLEGE STATION, TX 77840 (979) 764 -7743 • By MITCHELL MM MORGAN ENGINEERS & CONSTRUCTORS 51 1 UNIVERSITY DRIVE, SUITE 204 COLLEGE STATION, TX 77840 OFFICE (979) 260 -6963 FAX (979) 260 -3564 • CERTIFICATION This report for the detention pond analysis for the Dove Crossing Subdivision was prepared under my supervision in accordance with provisions of the Bryan /College Station Unified Drainage Design Guidelines for the owners of the property. All licenses and permits required by any and all state and federal regulatory agencies for the proposed drainage improvements have been issued. es %iv e � JOELJ. MIT • goo oel J. itchell, P.E. oxkf,brSTe.0 w�'' Regi ered Professional Engineer 4>� 54rovR�s�'1: Sta •- of Texas No. 80649 • Dove Crossing Subdivision • The purpose of this report is to state findings on the Dove Crossing detention pond analysis. The pond is located near the South Fork of Lick Creek and south of the Dove Crossing Subdivision in College Station. The objective of the proposed detention pond is to attenuate flow in Lick Creek so that development would have no adverse effects downstream (River Station 5929 and under). A dynamic model for Lick Creek was used to analyze the results of the proposed detention pond design on the Lower Lick Creek reach. The proposed detention pond was designed based on 100 year flood event conditions as provided by the Unified Stormwater Design Guidelines which states that detention ponds adjacent to the primary system need only be designed for a 100 year return period. The proposed detention pond was graded as shown in Exhibit 1. The pond has a bottom elevation of 276.5 and top elevation of 285.0 feet. Table 1 contains the elevation -area- volume for the detention pond. Table 1: Detention Pond Storage Volume Elevation Area (sf) (Ac -ft) 276.5 3168 0.00 277 26077.15 0.10 278 57006.68 1.03 279 84550.39 2.65 280 90362.07 4.65 281 96274.86 6.79 282 102287.61 9.07 283 108401.17 11.49 • 284 114250.17 14.05 285 119828.34 16.73 Based on the pond location, a portion of the peak flow from Dove Crossing Subdivision through the channel parallel to Alexandria Avenue and a portion of the peak flow from Lick Creek South Fork will be diverted into the pond. Weirs were placed along the pond on the upstream side to redirect flow into the pond and reduce maximum water surface elevation downstream so as not to exceed the existing conditions. A culvert was placed on the downstream side of the pond mainly for draining purposes after flood events have past. The proposed culvert will be a 21" RCP pipe. The weir will be constructed on two sides of the detention pond, being parallel and perpendicular to Lick Creek. The weir will span a length of 175 feet and have a graded top elevation of 283.5'. During a 100 year flood event, flow will be diverted into the pond from drainage conveyed from Dove Crossing Subdivision (parallel to Alexandria Avenue) and partial flow from Lick Creek South Fork. The maximum water surface elevation above the weir will be approximately 1.2 foot. Weir dimensions can be seen below in Table 2. Table 2: Weir Dimensions Weir Dimensions Weir Description Type Length (ft) Width (ft) Top Elev (ft) 1 Perpendicular to Lick Creek South Fork Broad - Crested 100 5 283.5 2 Parallel to Lick Creek South Fork Broad - Crested 75 5 283.5 * *Both weirs location on upstream side of detention pond • Dove Crossing Subdivision • Based on the results found from the analysis of Lick Creek South Fork, including the proposed detention pond, downstream conditions for the 100 year flood event were reduced below the existing conditions. As mentioned, flow will not be detained until the water surface elevation in Lick Creek at the proposed weir exceeds 283.5'. However, capacity will be used due to backflow through the proposed drainage culvert from Lick Creek. The base water surface elevation within the pond due to only flow in from the drainage culvert will be approximately 280'. Despite the capacity at lower elevations being consumed, sufficient storage will be available to detain flow from the 100 year flood event. By viewing Table 3, the maximum water surface elevation in the detention pond is 284.57', leaving approximately 0.5' of freeboard. Results contained in Appendix A show the output for cross sections located just upstream, adjacent, and just downstream of the proposed pond; as well as the most downstream location. The output contains the water surface elevations for existing and proposed conditions for the specified cross sections located just upstream, adjacent and downstream of the proposed detention pond. Exhibit 2 illustrates a cross section map of Lick Creek South Fork. Additionally, located in Appendix A is a profile illustrating the WSEL for the proposed and existing conditions 100 year flood event for Lower Lick Creek. Also attached to this report, via cd, will be the HEC -RAS and HEC -HMS models used in analyzing the proposed detention pond. Table 3: Detention Pond Results Storage Area Profile Storm Event Max WSEL Min Pond EL SA Area SA Vol (ft) (ft) (ac) (ac -ft) • Pond B Max WS 100 yr 284.55 276.50 2.86 15.51 In conclusion, we feel that the dynamic model used to illustrate Lick Creek creates a good representation of the effects of the proposed detention pond on the 100 year flood event. The proposed detention pond provides sufficient storage to attenuate flow from development and reduce downstream conditions to meet existing water surface elevations. • S: \Prof\ 0804- DoveCrossDetention \docs \0804- Design_letter Dove Crossing Subdivision 1 / I ¢99 { q / 1 I I \ \\ 1 1 1 • F e ei , „i k j \ J i t 1 I \ 1 1 t r I I - - - i i 3 ki11 9 1 �` 1) 1 \ m , 1/ ; 1 1 1 b.4 4 ME ' b A 1 iiiit5 9� 191 ‘� I anuany i � a ua __ y { f ¢ Y ! ) 1 , ue 18 B i i a� ill. 1 i �\\�uJyQnj I 1 j 1' i E k i ! {C 1 / / );-- r ` v � r, � ' ii 1 i ' 1111 Y 9 � E[ �1 k �� a i i . l ° til k ' i ( , ,zz- -- .......................... _ =/ _ - __=” -' - ' _- , -- --R- — , '' 1' IJ ' � I & 1 1 1 ' r i t i fj i ! ! y E � j 1 I "`\\\ v / ', 1 / ` '" .___._._..._._.. 1 i 1 it 1 i, 11 Y 9 i q i BuTildq i j I l j 11 i i \ . I i i I., "k f E ■ I. I . I / 1 11 1 2 ills g3 Ie g i y, /� �J , 1 1 a �i �i ip 0 P � {i \ \ I 1 \ \ I 1 Tr y 1 ' 1 • Nil le l g � r iii I 1 ' L I` \ 1 \ ` I i 11` I 1 11 i ' i i i 1 6• g p i 0 II ■ i ( � \ \ \ I • 1 \ 11 : i 3 p j ~\ 'd t\..........\\ \\ \\ O f T IV A 18 \ \ \ \ I IY 1 I \\ \ \ \ \ / ■ \ ',i i 1 1 n \\ \ \` \\ \\ 1 -� II j *� 1 s F ■ \` \ \ \ \\ \ \\ • ''I i i g b i y \ I .1 // 1 1 'i E ; y I \ \\ (I ! \ I I I �i I I € 8 I- �) < </ \ ``' — 1 il ; \ f a Z r 1 — \ \ ( I ` /,-- / 5 l' 1 j 1 1 I I I \ A 1 ' r _� / l 1 " j , , I \ ' i t I \ r • J I F C ' 1 1 111 T 1 1 1 , ,, „ ....., \ \ \ / / /// ".... ..." . i 1 ( /,',' / ,i/ '0 , „ , , , ,,,,,// ____, ..,- ss ,....__„/„ ,/ ,/,/ , 4 1 IJ s ii t ` ' °l \--:::::::„..._:,/ / / LQ�. ` " ' //� 11 11 i X= III ' T / / -- -� _i � `` - - - - - o ,III! 1 1 /^ \ 11 `l ' " - - --s fir 1 , i , 1 + �— 1 / I k'- 7 - - -_ /-' _ ,: _ _ ` III I T 1 T — r ' , ) ■ 1 F-' c\ '4,1 i � I I, 1 1 1 ( / • / , I I i 1 11 • 1 1 `\ / / / 1 1 / 1 14 , • Civnnevgoe „,,, Zr. REVISIONS `.� DETENTION POND PLAN :°' ° ` mown* `� °O'" ///i���, .o>.,KR.,l.�......,..,. 02-0.-0. Ian .o..I«e& .....1 s: OEM. M 11111. � DOVE CROSSING DETENTION STUDY c.�w.swm. ®TWO KM 041E: __ COLLEGE STATION, TEXAS no. s.. nsa. c.u.oaulm. ®na IC kii 10701 ..] Fu:1.1.I76Fms P , Clip . , ..."".... r .. • , , , . / . ..., , , f i \ I . . ,, . • iv ( t I I rl , . 1 \ . / .:. S t 1 gill .. ` ,_1 M j / • M \ ( ,. l , . ....,.. ,.J I ... / / / i , i i . l 1 I' I I • ■ j . 7111., I \ (I • } 1I 1111. ' I — .1 ) i ( . . 1111 9 .I. , i , J \.: ' I 1111_- 1111 1111 - vw r - ---- --- --- i ( 11 11 1 + N. - I 11,11., �4— , i i l' 1 I . (i s 1 � / _.1 1177, r _ l_. ',' 1111 ' I '` 4.. U N Nn - • � I I I, r , i ; , l: 1 • 11 11 1111 , ti . ' • r" i $ 1 is I o < t —.. ( 1111':.., t 2 1 a� i. , _11,11. 1111 11 ; • 1111... -. 1111 1111 , •� l , -. 1111. 1111 ,.i 1 • i r ,: ' 1111, ■ j l _ 1, , 1111 ....� away 1 11 11. 1111 1111 ..ap:r. I . 9 . 1111 1 47...4_,_ i I } ,� l t • 1111 ,• /f •_1 /� ' 1 I 1 - 1111.. i ° 1 1111.. 1111 % r . t 1 � . I wN-- I _1111 1111-- -- -- I1 : r. ... 11 11.. MI •- 1111. fl I }' Ir "u ) .....,.a.a ;1111, i I it . a 4 \; 1111 - - agg... N , ` r , ,\ 1111 ....._.. ,N ,a. as 1111. I _••••! • ,✓ i JNI''..� 1111 11:11. - 1111.._. 1111. 1111. 1111 9 / 1 I ` \. wN .• 114111111611- '_- '_--- __.� .____ , 1111 1111_._ �. YY , � : I j wa.a I r. ` 1, - i 1 1 % \ l I ; i '. 1 77947.. —_.__ 1111 1 f s ' i 1 • • . ...' i l ;, ... n.IryN t . T � ,1111.. � - r . 5�/ 1 : 1 ,. k ! , ''1111 °0 1 , 1111 ( t 1111., ....... . Mitchell & Morgan, LL.P. a CROSS SECTION LOCATION MAP Consulting Engineers and Constructors 'Q � , n r *� , a ■ m hD 511 University Drive East, Suite 204 0 L1 m N (F,' Li Co l lege Station, Texas 77840 7_,.'11 t 61004 D l S DOVE CROSSING SBDIVISION a 4 ; z F / 7 (979) 260 -6963 Fax: (979) 260 -3564, 1 S g a � a g • 5 � o I \ _ °o p n O • O CL • •_ y 3 w o O C 3 m a d s y J 61 d U -O O O r d ry ry N N N ry (y) UOi�enel3 • ,,,,,,,,,,, ,,,,,,, , . . N N N N 3 N N O O U c c o 0 0 a.) II O u _ L M M 9., O (O (O N M 01 N N N Q r nu` v� vv 3 u , co co v v v O : LL C`) tf o0 N Ul 00 (() U) N N (D OD .— O N N H fh ('7 C C J In O[) U � ar m. G. !. ((0 r C) N 41 P Da) D0) CD O co M O D) er O O Cn OO OO O O OO P 'v 0 0 0 0 0 0 0 0 W r- Ps N. 1— CD r- Ps co op 1.11 v C0 er W e op op m c co op n r- y.N N N N N N N N W c H 'C • U H • 0 00 0 r v M N e ms) 0 aD (D (D (1) M N N e C) > 4 re c � N N N N N N N N U . 0) 0) (D CO ((0 ( W - N N O W = L O o u) u) ( u) C7 C U v: W op CV r` r h CO (D C: N N N N N N N N (O (O '�t (NI CO (C) r h u 6 O ) (D u) N o O) f 0 r r CD OD CD C7 O ": O O 0 ` O 0 0 0 0 0. 0 0 l • O I O' I O � O: a n c C H N N N OD OD OD OD 07 OD OD OD vl CI CO rD 0 u) LL) CD �. c3 0 OD, u) tp '. CV N N . O O O O ((5 • (a (( (0 (0 ((5 c� as c � . cc cif 1i) a a c4 Q Q J J J J Y y Y Y Y Y Y Y • a) U U U U U U U U O O O_ O 11 10 m rl •o -' c � F 0 Q _ 1 T/J C w a c � g J X N m J X N m 8 g g 8 g g n M 8 8 c o w F.; z -:3, c� a o w e a 8 II o N N N ' - C 'a • Q. . - o n - O O N o — Q ° ^ I K b Q N .X II X . W K � O N t y N J N -H t - o n 0 K , O s O P' p m U x O X O Y W - 111 J y m N K m m , U U J J • Y N .... O . .. � • N N m � O N N N 'Al N N N N N N N N N N • (ype ) uon93 (0011..13 ) uoel3 °o -5i �I o 'I a s i 7 w n a a g • J X % N m J % C7 m N -o N -` Vf 8 8 T \ . Q • _ w -o Q O. m a N n y • N o�m 8 n 8 C 2 . Y - n N o' mo N E m n m cr, 8 8 K "1 k- # • _.l 3 N_ J m w F, - N m m y m N a d o a U y N J , . 1 C II O II p O ' ' o O K % O N X O O W - W Y - Y d N d m U y U ' U U J J . • p 1 N N N N - N N N N N N N N N (y) uopen93 (Y) uopen93