The URL can be used to link to this page

Home My WebLink About25 Development Permit 482 College Station Baptist ParkingI DEVELOPMENT PERMIT PERMIT NO . 482 PARKING LOT EXPANSION -COLLEGE STATION BAPTIST CHURCH FOR AREAS OUTSIDE THE SPECIAL FLOOD HAZARD AREA RE : CHAPTER 13 OF THE COLLEGE STATION CITY CODE SITE LEGAL DESCRIPTION: Vol. 315 , Page 104 -Morgan Rector League , Abstract #4 7 OWNER: College Station Baptist Church 2555 Texas Ave . S. College Station, Texas 77845 693-8564 DRAINAGE BASIN: Bee Creek -Segment III TYPE OF DEVELOPMENT: SITE ADDRESS: 2555 Texas Ave . S. This permit is valid for construction of a parking lot expansion as shown on the approved construction plans. The Contractor shall take all necessary precautions to prevent silt and debris from leaving the immediate construction site in accordance with the approved erosion control plan as well as the City of College Station Drainage Policy and Design Criteria. The Owner and/or Contractor shall assure that all disturbed areas are sodden and establishment of vegetation occurs prior to removal of any silt fencing or hay bales used for temporary erosion control. The Owner and/or Contractor shall also insure that any disturbed vegetation be returned to its original condition, placement and state . The Owner and/or Contractor shall be responsible for any damage to adjacent properties , city streets or infrastructure due to heavy machinery and/or equipment as well as erosion, siltation or sedimentation resulting from the permitted work. Any trees required to be protected by ordinance or as part of the landscape plan must be completely fenced before any operations of this permit can begin . In accordance with Chapter 13 of the Code of Ordinances of the City of College Station, measures shall be taken to insure that debris from construction, erosion, and sedimentation shall not be deposited in city streets, or existing drainage facilities. I hereby grant this permit for development of an area outside the special flood hazard area. All development shall be in accordance with the plans and specifications submitted to and approved by the City Engineer in the development permit application for the above named project and all of the codes and ordinances of the City of Hege Station that apply. Dat? / Contractor Date CITY OF COLLEGE STATIOH *** CUSTO"ER RECEIPT *** OPER: "RODGERS CT DRAWER: 1 DATE: 1/23/98 00 RECEIPT: 0006301 DESCRIPTION QTY A"OUHT TP T" "!SC EHGR CHARGE $100.00 3D CK Til'IE: 11 :57:29 TOTAL PERSONAL CHECK A"OUHT TEHDERED THANK YOU $100.00 $100.00 DRAINAGE REPORT FOR PARKING LOT EXPANSION COLLEGE STATION BAPTITST CHURCH 2555 Texas Avenue South College Station, Texas Block 1, Lot 2 Krenek Tap Subdivision OWNER: College Station Baptist Church 2555 Texas Avenue South College Station, Te xas (409) 693-8564 Pastor: Jim Heflin Representative: Jody Quimby (409) 268-5520 PREPARED BY: K. W . Brown Environmental Services 501 Graham Road College Station, Texas 77845 (409) 690-9280 Representative: Rick Conlin Originally Submitted: June 18, 1997 Revised and Resubmitted: October 20, 1997 APPROVED FOR CONSTRUCTION JAN 2 3 1998 COLLEGE STATION EN NEERING A DRAINAGE REPORT FOR PARKING LOT EXPANSION COLLEGE STATION BAPTIST CHURCH GENERAL DESCRIPTION AND LOCATON OF PROJECT The proposed project consists of the expansion of an existing parking lot for an existing church, the College Station Baptist Church, which is located at 2555 Texas Avenue South in College Station, Texas. As illustrated in the accompanying Figure 1 -Site Plan, the proposed parking lot expansion project will consist of several elements: a newly paved area; ,a small earthen drainage swale to route stormwater from the new parking lot to an existing ditch along South Texas Avenue; and various landscape additions. No building or utility construction or relocation, or other drainage structures are anticipated in connection with the proposed parking lot expans10n. The proposed parking lot expansion is planned for the area located immediately south of the existing parking lot and west of the existing church building. The area planned for the new parking lot expansion currently serves as a portion of the front yard" of the church and is covered with grass and scattered trees. The proposed new parking lot addition is roughly rectangular in shape, with approximate plan dimensions of 60 feet by 190 feet. The new parking addition will cover an area of approximately 9,840 square feet or 0.23 acres, as measured both by hand planimeter and by electronically outlining the area in AutoCad (Version 13). The proposed expansion will provide approximately 29 new parking spaces. As illustrated on Figure 2 -Grading and Drainage Plan, the direction of surface stormwater flows across the site will not be changed by the new parking lot expansion. As indicated on Figure 3 -Site Details, the proposed new parking lot will consist of an asphaltic concrete flexible paving system which is "bordered" by 6 inch high concrete curbing. The paving section is composed of 2 inches of asphaltic concrete over 6 inches of crushed rock base course overlying 6 inches of compacted subgrade soils. Drainage Report Parking Lot Addition Originally Submitted: June 18 , 1997 / Revised: October 20, 1997College Station Baptist Church DRAINAGE BASINS & SUB-BASINS The project is located within Bee Creek drainage basin, or more specifically, within Basin Reference Number 3, Regulatory Channel Reach Number III, of the Carter Creek Drainage Basin (Partial), as illustrated on the accompanying Figure 4 (Figure II-1 of the Drainage Policy and Design Standards Manual of the City of College Station, Revised November 1, 1990). According to the Flood Insurance Map for Brazos County, Texas and Incorporated Areas (Figure 5), the project site is not within the 100-year flood area, nor even within the 500 -year flood area. The project site is designated as being in "ZONE X" of "OTHER AREAS" which is defined as "Areas determined to be outside 500-year flood-plain." A United States Geologic Survey (USGS) topographic quadrangle map illustrating the general drainage patterns in the area of the project site is presented in Figure 6. A topographic map indicating existing drainage patterns in the immediate area of the site is presented in Figure 7. A topographic map showing the existing and proposed grading and drainage plans for the proposed parking lot expansion is presented on Figure 2. All of the maps indicate that the predominant surface drainage direction for the immediate vicinity of the project site is toward the southwest and Texas Avenue, or towards the south and Bee Creek. DRAINAGE DESIGN CRITERIA The proposed parking lot addition will discharge stormwater into the secondary drainage system for the area. More specifically, the storm water runoff will sheet flow across the new paved area to the new outlet drainage swale at the southwestern corner of the parking area (see Figure 2). The stormwater will then flow to the existing drainage ditch on the east side of Texas Avenue and then southerly to Bee Creek which ultimately discharges into Carter Creek. 2 Drainage Report Parking Lot Addition Originally Submitted: June 18, 1997 / Revised: October 20, 1997College Station Baptist Church As previously discussed, the approximately 0.23 acre area proposed for the new parking lot expansion is currently covered by grass. Following paving of the area, the storm.water runoff will be increased. Since it is the policy of the City of College Station to attempt to prevent potential problems associated with stormwater runoff, the increased runoff will be temporarily detained by the curbing of the new paving. The increase in the storm.water runoff can be calculated as the difference in the magnitudes of the runoff coefficients (C) between the grass covered and the paved areas. The rational method was used to calculate the peak runoff for five return storm periods: 5 years, 10 years, 25 year, 50 years, and 100 years. The intensity of rainfall was computed based upon a minimum time of concentration of 10 minutes. The time of concentration was determined for the approximately 170 feet distance extending from the northeastern corner of the new paved area to the southwestern corner of the new paved area, at the head of the new outlet discharge swale (see "Calculations" in the Appendix to this report). The following Table 1 entitled "Calculation of Storm.water Runoff Quantities Using the Rational Method" lists the parameters used and the results of the calculations. 3 Drainage Report Parking Lo t Addition Originally Submitted: June 18, 1997 / Revised: October 20, 1997College Station Baptist Church Table 1. Calculation of Stormwater Runoff Quantities Using the Rational Method Storm Almp Acrass Al.mp Aa:rasa C1mp• c,ra .. • Intensityc Qpre Qpost Event -pre -pre -post -post uear acres acres acres acres dlessb dlessb inches/ hour cfs cfs 5 0 0.23 0.23 0 0.9 0.5 7.7 0.89 1.59 10 0 0.23 0.23 0 0.9 0 .5 8.3 0.95 1.72 25 0 0.23 0.23 0 0.9 0.5 9.8 1.13 2.03 50 0 0.23 0.23 0 0.9 0.5 11.1 1.28 2.30 100 0 0.23 0.23 0 0.9 0.5 12.6 1.45 2.61 Notes: a -Values obtained from Table III-1 in "Stormwater Management Plan for the City of College Station -Drainage Policy and Design Standards" of the City of College Station. b -dless = dimensionless c -Values obtained from Figure III-1 in "Stormwater Management Plan for the City of College Station -Drainage Policy and Design Standards of the City of College Station. Qt, cfs 0.70 0.77 0.90 1.02 1.16 A review of the calculated discharges for the five return storm periods listed in Table 1 indicates that the increased storm.water discharges attributable to the newly paved area will range from approximately 0.70 cubic feet per second (cfs) for the 5 year recurrence period to approximately 1.16 cfs for the 100 year period. The increase runoff will be detained for the requisite time period by the curbing of the proposed new paved area and by the controlled discharge through the opening in the curbing at the head of the new drainage swale to the ditch along Texas Avenue. Calculations illustrating the capacity of the new parking area for detention as well as the routing of the flows through the detention area are presented in the "Calculations" section of this report. The detention time of the increased flows will be at least 1/5 the time of concentration, or in the present case, at least 2 minutes, as required by the City's design standards. 4 Drainage Report Parking Lot Addition Originally Submitted: June 18, 1997-/ Revised: October 20, 1997College Station Baptist Church CONCLUSIONS As a result of this parking lot expansion, a minor increase in storm water runoff is expected. The additional runoff will be detained within the curbed section of the new paved parking area. The curbed area of the new parking lot provides adequate storage capacity of the calculated incremental increase in storm water flows for the requisite detention period. "I hereby certify that this report (plan) for the drainage design of the parking lot expansion of the College Station Baptist Church was prepared by me (or under my supervision) in accordance with the provisions of the City of Colle~e Station Drainage __ .......... ,,,, Policy and Design Standards for the owners thereof." -~f..\~.~~}f~ \\\ 5 ;"S .. ··· *···-:f& .,. , • • l ,.. .... ·· .. •'i f * :' ·: .. !i. , ................................. ~ . ~ .. ·:~:'..:.?.~.~~'.~·.~~-l _. ~ 1,~.... 44481 ~~iiofi~ •,o~.:9~G' ~ ?..~~.·~«;.,, \ ~S .. " /~TE._...~ , '',~ZoN.A\..'ic.~~-- ~"~"' Registered Professional Engineer State of Texas No. 44481 Drainage Report Parking Lot Addition Originally Submitted: June 18, 1997 / Revised: October 20, 1997College Station Baptist Church REFERENCES Stormwater Management Plan for the City of College Station -Drainage Policy and Design Standards. City of College Station. Flood Insurance Rate Map (FIRM). Brazos County, Texas and Incorporated Areas. Panel 144 of 250. Map Number 48041C0144 C. Effective Date: July 2, 1992. Federal Emergency Management Agency. APPENDICES Figures Figure 1. Site Plan (see accompanying 24" by 36" sheet) Figure 2. Grading and Drainage Plan (see accompanying 24" by 36" sheet) Figure 3. Site Details (see accompanying 24" by 36" sheet) Figure 4. Site Location Within Drainage Basin (Carter Creek Drainage Basin -Partial); Stormwater Management Plan for the City of College Station -Drainage Policy and Design Standards: City of College Station. Figure 5. Site Location With Respect to Flood Plain -Flood Insurance Rate Map (FIRM) -City of College Station, Texas; Brazos County, Texas and Incorporated Areas. Panel 144 of 250. Map Number 48041C0144 C. Effective Date: July 2, 1992. Figure 6. General Topography in Region of Site -United States Geologic Survey (U.S. G. S.) Topographic Map -Wellborn, Texas Quadrangle. Figure 7. General Topography in Vicinity of Site (City of College Station Map No. 561206). Calculations 6 APPENDICES Figures Figure No. 1. Site Plan (See accompanying 24" by 36" drawing) Figure No. 2. Grading and Drainage Plan (See accompanying 24" by 36" drawing) Figure No. 3. Site Details (See accompanying 24" by 36" drawing) Calculations __ .Gene~-"O:fut~~e---=--==-:__-eA.~KC~ co~x...-po;nsioQ__ ---~:_:==-~--------l --=-----C(iT c ~tr1~~~~ __ _ _ ____ ~C.._<f>.~-13~ --51~5,c;:-~----~~Y\~-~, r_czj7 _ --------~ ~----.-L o "W)el<\s ioV\s a--9-New ra.v e..cl A'("'eA_ ( ·- "'"'"' ......... ......... ......... :z::z::z: "'"'"' 000 11100 -N --1"'--r------------__ 1_'!__~-~-1 n,ct.SD._. ------------------'--. -.----=--..- ~ c~'<'b Ope ntx\~ 2. . co V'<\ 'P u...te S Lo pe1 5 . _, EL .. ?,z.5 s rz7 _ ·6 LV\. e\.e..v o..~·o"{\ =-'t 50 ~. -7. 215'9-e =-z. '2. 6~. ~ 1 3 °' 1 f() d,... S~Y\ce_ i 7 0 flt.. 170 <¢b, -• Ii! .3 _ CoV','\ ~~e. V e.loc.1~ O.V\-t:e.~0L01.-te ~"'o'(Y\_ ---r;,ble. lif-2. ~ 1Jesi~Y\ Mtmu.Al --h:."" -po..\/e.W\e '(\i::$ . ; . . l . . _ , veloc.I 1' 'Rv.."'o~ ~lo"' ve oc:.1~1 v =: 6 'lofe '*--ch.u.~ ~~-C-~ .s&:,pe. i.xt ~ g,5~ V ':. 1..3 °lo '.c. 17 :3%. ~ ::J, 7 ~-.-5 4-. C.owvru.:re. ::Ume.. ~ Ca~c..en-bco±-k,.,\"' tc- cli s-h::.. '<\Ce oP-+lo \)} 1 '7 0 -t-b-, \ tc..-=-veloc.i~ =-3. 7 {2.-pS ~ 4-G s-e~'<'Ols o'f' 0,7U,'Yv\iYlJA. -~e 7 Yn.\V'\\mu.~ -b-c.. o.(2.. J..() ~; 'O.l.Ltss Co'MpvrE OvrLET t)r:SCJt8R6LTh&oo..Gtt Ct rRe 0FENrN6 P..s!::i L\.me th<>..+~ ~'()ci 5 fo'<'m.1..\k fh'<''<'eC.tu't"'\5v....lo.:<' \Ne.l.x-:s wi LL co V\.-b<'o L the ...P.~w Q =-3. 3 3 (L -CJ, 2 J-}. J 1-/ 1·5 wl.r-.e..'l('-e., Q = cu.. -Pt. JI. Wo...-f:e'<' L =-Le'<\ei~ o~ w_e_i,'!' open1"~'5 Ln ./lts.J = D. Si2t: f-l ~ h_ et:A.&_ d rt W e.1 '<' L 'f\ -t-eet- Su...6 s + d:t:t.tl '<'\~ -h,"' d; ~tev-e,X'Lt vo..Lu.e.s ¢.P J..I ~ i'eld..s A . AM PAO 22-141 SO SHEETS 22-142 100 SHEETS 22-144 200 SHEETS (5) ~ (fl 0 ~ ~ 'l ~ C> ~ 0 ... ~ ..... ,, f\/ ~ 1} to (J\ ::r: O> ,__ t -::z ~ I C> () . to ~ t-- ' ; I ""'"" ............ ......... ......... :c :c :c ""'"" 000 11'100 -N ---NNN NNN . / CoMPUTPt-TroN of= F°LOW CAPACITY 01= OuTLET 1)~/:\~ ~I;. r SwPtLI:. . l="'R.ClM NEW 'PAR.KLNG ~AREA ~· l?ime~sioLl~~ ~ c:it-d:~ J'<'O.in..a.~e ~w~ (4~1 ~iele ~ ~ -.... -e~t.. ~. -t:h.e.. e..°'"~~ J:d:::;c~ .shown ~el.ow ..... I Cl) Cl) Cl) WWW a: a: a: <t <t <ta: ::> ::> ::> w 000...J Cl) Cl) Cl) ..J LO LO LO ii: I I I I ~~~~ wwww wwww ::i: ::i: ::i: ::i: Cl) Cl) (/) (/) 0000 LO 0 0 0 .... Cll Cll I I I I LO <O I'-I'- <') <') <') <') Cll Cll Cll .... 9999 <') <') <') <') 1-w ::i; 0 (.) , C..o.trt PwrA-r.r"NS ILLUSTRATING FAiRt~r:NG _f.4F1JgJ:.NTmJ CFtFACI:T). .· .. !r.\titi..-i.li~&ii~-'~~~,b~~1>k~p~iK Efl~-" . i- --CD~o'C\c:U ~~ -ro $~g..~ °flp __ OP W&~h·~··q..~_·:the __ D_(Ji..tL-et:: -·-evq..t:-10.n,. ___ _ A-. C.o'<Y\-p~ vo ~W\e ~ ~u..la i c . .+ee.:c· .'<'e.-to...~"'J.,bj ,-the .J'o~iovt~~ -po-'C'¥-t'<\:1 6-t; ,g.± o'C .6=.1.o'-" ~ ~-1" ~~ ele.Jo:bon a± -t:he. -P-Low cu±Let---yo~'Ctb o.P. ~ ~'0\'-\\f\J , Lot-, t,,e, J : r/:.""9C EL ~7. 75 . . .._ .. ,. ~--·~·---. ·--· ' ' i-. . --•-r- . I -~<.t:t . _,,_ --· -~ .....f-•-l -\ --1 -··t ---;-·-·-r--· ,..~ -r·-;-·--·........ "" r 1· ---• --1-----t. - ' .. I I I j t • -r !-1 . ;· • :----i--: ....... , .... i ~ t-·· :---i -.1 1 ·t t-· ; · .. ,.,-roe '7.1 · '' I " , . Tu...'f'Y\,.O..'l'oU.N"\d., o..'f'~ : .S.fu. "" 2. 5 It . = ~' . 1<eW\o..iV\i~ ~,'o.V\3ul °'-'<' o-..\f'e.o... ! Y~ )(, 30~ -,<._4<;, ~ .:: ~'<'e!A..· s~ -To to..L ~ Volv...w-.e o ~ 'Ret;-en-blO'i\. (b~ O '<'\ Co II h.1jh Cl..l"<"b) \j 0 kVY\e o+-~n1:-i oll\. = C\.'\'ea,_ ~ C.u...'<"h ~e,·~ ~t- . _:: 7 i 5 .f.c,'2. 'J... 0 I 5 ~, ::-~5 f, 5 ft. 3) 5 ~ 35<6 C ll,.\4,-. Ir.. -;-,_-Me ~ 'Re.-te'ftt;)'o 'Q -fu '<"' 1?:N't;io V\... ~ R'<'k t n 5 Lot-~-t:-o"' 13e~w O u:.t:r-Le-t-TDC t= LeV C\..ti on.. f\. "De.si5'<\ Flow Cf) Cf) Cf) WWW a: a: a: <( <( <( a: ::> ::> ::> w 000...i Cf) Cf) Cf) ...J LO LO LOU: I I I I Cf) Cf) Cf) Cf) 1-1-1-1-wwww wwww :::c :::c :::c :::c Cf) Cf) Cf) Cf) gggg ~C\IC\I I I I I LO CO r-. r-. C? C? C? C? C\I C\I C\I ~ 9 9 99 C? C? C? C? 1-w :i 0 (.) -. -th.~ ""'' 'f\ I ~"' \ LI.. V'tl.. di::-=tt'<'---c-t-o."i·L fr i vne.. -f-oy-:the IV).~ e.. '-Vl '<'1.A'<\of.F . ~-ha~-~~ ~ ~e-~l/5 ~? ;tk. i:i"Me. ~ coY\ce~~of\1 tic. , '75".'ft'\O\C'\~),_,o_~ fv\ \_V\l.X'l\V.... . Y'ete rti~ ±:i_ VV\~-=-· ~~i:t~--1/-5 o.p ~1_n.)_~_2._~ ~ .. - .. -.. ; .. ...i __ ! ·+----!· --~ ---... ! --~----! -+ > :_ -'--~ .'. J ~ __ ;_ --.-- _ ... C.1 ~e.~~'YY\JV\ei:I~ Su+:P;c.ien:t-_ Sto'f:'O.~-; Ex.i-sts; 4"<" tv\\Y\\-M.u l?e . .te.n.ti on. Tim. e · · ' ; _: _\/~_Lu.'«\e_-~_ "'u.VLci!P-: .. -ro _ ~e .~~-=-QA · _)t_ 'ffll'l\.xe~~t-if>Y\ t\ .. v~ L.1.A:\Me...r L .iC.. C.IA~~4ec. 1(.. '2 V't\;nlA."t-e.s I~ (10.secc~M,-~ _: \JaLu.me.::::: J.3<=t _c..u...%--' . --. -, -1-. . l -which is 1.ess _~V\..-tirle ~.si cu.:_ft.. ~.G.a..l.c~+eo{ ' ~OY'<"l ~ o'O. ~e.. "f'\€.V; 0 U..S. '?°"-~ e.., , . -~ .. lh_e~efu..eJ _stA.-~lci~~-b-eto~ie e.)(1._s"b.:5 -fo ~IV\ -the LV\ C.."\{'eP-Se i V\ '<"'LA.'l\ o..Afl ~\'--&he\.({\\{\ l '('(\U..W\. x-etevr&10Vl, t;; w..e. ' ·-·-· '. ·---r -:.-· ' . : .. ~-.. --·---. --t_--· .· --:---, ... T-. ·:i -.... r---_. ... c.... -... -.. -· ~.z.:~~~L~4t-e_1_-b-h~ .. A~~;n~1-~:Re~ex.t&;o~ _____ : ___________ _ ' ~ I j • ; i i : I ! A:;·.:._r &-.s.5~~(~ --N~-·o·~~~ __ fuvn 'Pa.~~ ~ot;-. flk.buol f.me of Rebe"*lon.1 "tr.c-: >S+.~e VolJ.,.me .r2.~, I -1:. ... -·-351) Cl,\., -Pt. b JOO ~c..~ i, t C .e.u..ft. I sec _ -i:-~o.ctv...Cl.l-~ -30 CJ sec.oncls 6 '(' $ 'Ml'<\\..\.,t-e.5 13. -{\ s.s IA..'«\\ ~:J 0 ur l e.t-FL.ow K<o YV\. ~"'Ki 'f\~ Lot- . :-'-fu"(' G '' bw:::,¥..'+J°'--\-e'<'-~1 ou±A.e.tr,~l.6w .::. D,47 c-% (fum- ~e.-$ 2. o..~ 3 o-P-J°LA.\/\e 1 t, i'l't7 ca_.lclAJ.1:1.:h'oV\~. t--r _ S to~~ e Vo lt;..'r<1.s:=... o..c.tu,,J.v.//o~-w t:'i. Q ~ 100 G.v-J!.Lov.t) -o u.~low 1-w ::E 0 u .Ir .. C6.l_c:-uL,__te ~ete'<\..--\::roY\ Ca-.pctcr'-f:j O\ncl 7Tme5 o+-En-17£\f'e ~o.-'<"'ki~ Lot-_ . -·---· ._1 __ ·-- I-, \ -. - A.· V~Lu...me o~ e .o. .. :po_c,·~· 'R ete.n-b-; on Vo Lu.. m..e ~ --po.. '0~ \ ""5 Lot:-~ x-eC\.-'I(. c "'"'<'lo he..t5 hf- -<f I ~ 4-l) 6'f .-ft., ~()' 5-f!-t-, .:::. 4-~ ct 26 cu.~fe . 05 /0 1 /97 09 :15 U409 764 3496 IJ EY ELUPME NT ~vc~ Figure XII Development Permit City of College Station, Texas ~UUJ CoLLE.a.f.. Sl.flcl10/J. r!>AP"rislC.J.J.u/lc..U.1 Z555 /£-KA-':> .4U E.. s./2.?.;/x.. Site Legal Description: VoL. ?l'-?1 PAGt-Jo4, M oll6.AJJ ~tJtlf.A6.LJ£.,, A6sr!2,41::(#47 Site Owner: Cell~~ ?f M!o}l bAPnsrlJJufi//Address: Z 5? 5 T~,4Ve. S., C.S.,l,x. Telephone: 42 3 -85'-4-7 ' Architect/ Address: 501 6./1.Jr!Jttm ~' C..,$./)<. Engineer: V,..w. r!;f.owt.J. f.IJ V. ~Ulct..$ Telephone No : ~qo-q z... Bo Contractor: Address : --------------------~ Telephone No:---------- Date Application Filed : _______ _ Approved:----------- Application is hereby made for the following development specific waterway alterations: ~ Application Fee Cl Signed Certifications 0 Drainage and erosion control plan, with supporting Drainage Report two (2) copies each. Q Site and Construction Plans, with supporting Drainage Report two (2) copies each. 0 Other: ---------------------------~ ACKNOWLEDGMENTS : I, M. f f?~f:.R-tC-K,. C..o bl LI bl , design engineer/owner, hereby acknowledge or affirm that: The information and conclusions contained in the above plans and supporting documents comply with the current requirements of the City of College Station, Texas City Code, Chapter 13 and its associated Drainage Policy and Design Standards . As a condition of approval of this permit application, I agree to construct the improvements proposed in this application according to these documents and the requirements of Chapter 13 of the College Station City Code. , .. _...,-_.L.:_ __ . \' DRAINAGE REPORT FOR PARKING LOT EXPANSION COLLEGE STATION BAPTITST CHURCH 2555 Texas Avenue South College Station, Texas Block 1, Lot 2 Krenek Tap Subdivision OWNER: College Station Baptist Church 2555 Texas Avenue South College Station, Texas (409) 693-8564 Pastor: Jim Heflin Representative: Jody Quimby (409) 268-5520 PREPARED BY: K. W. Brown Environmental Services 501 Graham Road College Station, Texas 77845 (409) 690-9280 Representative: Rick Conlin Originally Submitted: June 18, 1997 Revised and Resubmitted: October 20, 1997 APPROVED FOR CONSTRUCTION JAN 2 3 1998 COLLEGE STATION w~ DRAINAGE REPORT FOR PARKING LOT EXPANSION COLLEGE STATION BAPTIST CHURCH GENERAL DESCRIPTION AND LOCATON OF PROJECT The proposed project consists of the expansion of an existing parking lot for an existing church, the College Station Baptist Church, which is located at 2555 Texas Avenue South in College Station, Texas. As illustrated in the accompanying Figure 1 -Site Plan, the proposed parking lot expansion project will consist of several elements: a newly paved area; ,a small earthen drainage swale to route stormwater from the new parking lot to an existing ditch along South Texas Avenue; and various landscape additions. No building or utility construction or relocation, or other drainage structures are anticipated in connection with the proposed parking lot expansion. The proposed parking lot expansion is planned for the area located immediately south of the existing parking lot and west of the existing church building. The area planned for the new parking lot expansion currently serves as a portion of the front yard" of the church and is covered with grass and scattered trees. The proposed new parking lot addition is roughly rectangular in shape, with approximate plan dimensions of 60 feet by 190 feet. The new parking addition will cover an area of approximately 9,840 square feet or 0.23 acres, as measured both by hand planimeter and by electronically outlining the area in AutoCad (Version 13). The proposed expansion will provide approximately 29 new parking spaces. As illustrated on Figure 2 -Grading and Drainage Plan, the direction of surface stormwater flows across the site will not be changed by the new parking lot expansion. As indicated on Figure 3 -Site Details, the proposed new parking lot will consist of an asphaltic concrete flexible paving system which is "bordered" by 6 inch high concrete curbing. The paving section is composed of 2 inches of asphaltic concrete over 6 inches of crushed rock base course overlying 6 inches of compacted subgrade soils. Drainage Report Parking Lot Addition Originany Submitted: June 18, 1997 / Revised: October 20 , 1997College Station Baptist Church DRAINAGE BASINS & SUB-BASINS The project is located within Bee Creek drainage basin, or more specifically, within Basin Reference Number 3, Regulatory Channel Reach Number III, of the Carter Creek Drainage Basin (Partial), as illustrated on the accompanying Figure 4 (Figure II-1 of the Drainage Policy and Design Standards Manual of the City of College Station, Revised November 1, 1990). According to the Flood Insurance Map for Brazos County, Texas and Incorporated Areas (Figure 5), the project site is not within the 100-year flood area, nor even within the 500-year flood area. The project site is designated as being in "ZONE X" of "OTHER AREAS" which is defined as "Areas determined to be outside 500-year flood-plain." A United States Geologic Survey (USGS) topographic quadrangle map illustrating the general drainage patterns in the area of the project site is presented in Figure 6. A topographic map indicating existing drainage patterns in the immediate area of the site is presented in Figure 7. A topographic map showing the existing and proposed grading and drainage plans for the proposed parking lot expansion is presented on Figure 2. All of the maps indicate that the predominant surface drainage direction for the immediate vicinity of the project site is toward the southwest and Texas Avenue, or towards the south and Bee Creek. DRAINAGE DESIGN CRITERIA The proposed parking lot addition will discharge stormwater into the secondary drainage system for the area. More specifically, the stormwater runoff will sheet flow across the new paved area to the new outlet drainage swale at the southwestern corner of the parking area (see Figure 2). The storm water will then flow to the existing drainage ditch on the east side of Texas Avenue and then southerly to Bee Creek which ultimately discharges into Carter Creek. 2 Drainage Report Parking Lot Addition Originally Submitted: June 18, 1997 / Revised: October 20 , 1997College Station Baptist Church As previously discussed, the approximately 0.23 acre area proposed for the new parking lot expansion is currently covered by grass. Following paving of the area, the storm water runoff will be increased. Since it is the policy of the City of College Station to attempt to prevent potential problems associated with storm.water runoff, the increased runoff will be temporarily detained by the curbing of the new paving. The increase in the storm.water runoff can be calculated as the difference in the magnitudes of the runoff coefficients (C) between the grass covered and the paved areas. The rational method was used to calculate the peak runoff for five return storm periods: 5 years, 10 years, 25 year, 50 years, and 100 years. The intensity of rainfall was computed based upon a minimum time of concentration of 10 minutes. The time of concentration was determined for the approximately 170 feet distance extending from the northeastern corner of the new paved area to the southwestern corner of the new paved area, at the head of the new outlet discharge swale (see "Calculations" in the Appendix to this report). The following Table 1 entitled "Calculation of Storm.water Runoff Quantities Using the Rational Method" lists the parameters used and the results of the calculations. 3 Drainage Report Parking Lot Addition Originally Submitted: June 18, 1997 / Revised: October 20 , 1997College Station Baptist Church Table 1. Calculation of Stormwater Runoff Quantities Using the Rational Method Stonn Al.mp A.grass Al.mp A,rass C1mp• Cgrass• Intensityc Qpre Qpost Event -pre -pre -post -post year acres acres acres acres dlessb dlessb inches/ hour cfs cfs 5 0 0.23 0.23 0 0.9 0.5 7 .7 0.89 1.59 10 0 0.23 0.23 0 0.9 0.5 8 .3 0.95 1.72 25 0 0.23 0.23 0 0.9 0.5 9.8 1.13 2.03 50 0 0.23 0.23 0 0.9 0.5 11.1 1.28 2.30 100 0 0.23 0.23 0 0.9 0.5 12.6 1.45 2.61 Notes: a -Values obtained from Table III-1 in "Stormwater Management Plan for the City of College Station -Drainage Policy and Design Standards" of the City of College Station. b -dless = dimensionless c -Values obtained from Figure III -1 in "Stormwater Management Plan for the City of College Station -Drainage Policy and Design Standards of the City of College Station. Q t. cfs 0 .70 0 .77 0.90 1.02 1.16 A review of the calculated discharges for the five return storm periods listed in Table 1 indicates that the increased storm.water discharges attributable to the newly paved area will range from approximately 0.70 cubic feet per second (cfs) for the 5 year recurrence period to approximately 1.16 cfs for the 100 year period. The increase runoff will be detained for the requisite time period by the curbing of the proposed new paved area and by the controlled discharge through the opening in the curbing at the head of the new drainage swale to the ditch along Texas Avenue. Calculations illustrating the capacity of the new parking area for detention as well as the routing of the flows through the detention area are presented in the "Calculations" section of this report. The detention time of the increased flows will be at least 1/5 the time of concentration, or in the present case, at least 2 minutes, as required by the City's design standards. 4 Drainage Report Parking Lot Addition Originally Submitted: June 18, 1997 / Revised: October 20, 1997College Station Baptist Church CONCLUSIONS As a result of this parking lot expansion, a minor increase in storm water runoff is expected. The additional runoff will be detained within the curbed section of the new paved parking area. The curbed area of the new parking lot provides adequate storage capacity of the calculated incremental increase in storm water flows for the requisite detention period. "I hereby certify that this report (plan) for the drainage design of the parking lot expansion of the College Station Baptist Church was prepared by me (or under my supervision) in accordance with the provisions of the City of College Station Drainage --''''\'' Policy and Design Standards for the owners thereof." --;f..\~.9f.lf-t\\\ 5 ~~ .. ··· *"·-:f.s-'i ,. . . n "* .... .. .. •'i f * :· ·:./I 1·································J ~···:~:'..:.?~.~~·.~~·.~~· 1 _. ~ 1,~·.. 4448 j "{{\~iiofi~ t o ·· '9 <V •• ((;..r l\~··~~/ST£~~·~~ ... ''{~'.P&ii.\.~t--- Registered Professional Engineer State of Texas No. 44481 Drainage Report Parking Lot Addition Originally Submitted: June 18, 1997 / Revised: October 20 , 1997College Station Baptist Church REFERENCES Storm.water Management Plan for the City of College Station -Drainage Policy and Design Standards. City of College Station. Flood Insurance Rate Map (FIRM). Brazos County, Texas and Incorporated Areas. Panel 144 of 250. Map Number 48041C0144 C. Effective Date: July 2, 1992 . Federal Emergency Management Agency. APPENDICES Figures Figure 1. Site Plan (see accompanying 24" by 36" sheet) Figure 2. Grading and Drainage Plan (see accompanying 24" by 36" sheet) Figure 3. Site Details (see accompanying 24" by 36" sheet) Figure 4 . Site Location Within Drainage Basin (Carter Creek Drainage Basin -Partial); Storm.water Management Plan for the City of College Station -Drainage Policy and Design Standards: City of College Station. Figure 5. Site Location With Respect to Flood Plain -Flood Insurance Rate Map (FIRM) -City of College Station, Texas; Brazos County, Texas and Incorporated Areas. Panel 144of250. Map Number 48041C0144 C. Effective Date: July 2, 1992. Figure 6. General Topography in Region of Slte -United States Geologic Survey (U. S. G. S.) Topographic Map -Wellborn, Texas Quadrangle. Figure 7. General Topography in Vicinity of Site (City of College Station Map No. 561206). Calculations 6 APPENDICES Figures Figure No. 1 . Site Plan (See accompanying 24" by 36" drawing) Figure No. 2. Grading and Drainage Plan (See accompanying 24" by 36" drawing) Figure No. 3. Site Details (See accompanying 24" by 36" drawing) Calculations _-_ G_e'(\e~--"O~t~~e---~~~\_n.~I.OE:e:-~po.;ostoq==---==--==----=--==---==:=--=--=--~----l ~----c-~~-tr:t~=~~ ________ C.-:.S~SA: 'tii~Chv..~cn:: ___ ---~~e.J~~, i'i!t7_ -----_:. ~ "'"'"' ......... ......... ......... ::c::c::c "'"'"' 000 11100 -N L Dt,V'<)en_sioV\.s ""9-New ro.ve.J.. A'<'e..A- -r----------------~'t~-~-------._,.1 tL'tSD._-----------------'"-> ~--=----------.. -,~ c'l'<'I:. Open.in.'.'.!~· z . Co V'<\f> u..te S Lope1 5 S <r7 _ 6 l."'-e\.e.vo..~·o~ _ 't50*.-7.2J5ft _ 2..'2.G~. 1 .3°' I f{) -d{,s..fo..Y\c.e_ -i 76 flt:, -170'9f, ::,.. • ff, -3. CoW\ ~u.±e.. v e.loc.1~ o.V\te.'<"?olo..-te ~'<'OVV\. IO__ble. lif-2. ~ Ue.sl~V\ Mo.n~ -+b"" -po...\Je.V'<\e "d:5 _ _ . - l . ·. " _ , veLo c ,· ,· "Rv.."'o~ .Plo'VI ve <:ic:.~1 v _ -~ __ slofe .~ -chu.~ ~e'('t\_~t-'i' 4pc. ~ g,5~ v-=. 1..3°7° ~ I? 3%, ~ :::3, 7 ~ 4-. C.owvru.:t-e. ·°R'Me.. ~ CoY\c..e.v\t<n:b10n1 tc.- ~'~"'ce oP--+Low 1'70 -t-b--. \ -Cc..=-ve.Loc.i~ =-3. 7 ..fl.pS ~ 4~ s-ec()'<"ds o'(' 0,7U,'MiY11A. -~e 7 W\\'f)\~u.m.. -b-c.. o.(2.. LC m; vu .. Ltss Co'IV\pvrE OurLET ""DrSCltAR6£ 7J±.&QQ_GtJ-C.t rRa OFENrN§ t\.ss 1-\.'Me -tho...t -b\\E?. ~-oci s fo"('m1.>.k -fh'<''<'ecd:n.'<"\5u...lo..'<' \Nel.'<'S wi L1 coY\.~o L the -{2.LJ:>w · Q :=_ 3~33(L-CJ,2.J.t)J-/ l.S W~e.."'e. J Q = cu . -Pt. J2 w~--t:e'<' . L =-te.'<"\~th o~ we.i,'{' opeY\l'Aj Ln .fltr.1 -= D. S iZt: f-1 :: h.eo...~ on. we.\'<' LY\ +:eet -su...6s +1·-bttiv\3 ~"' d ; ~k'f'e,'fLt v~e.s ¢42 _J..I ~ i'eLd.s ., I ' A . A M PAO 2 2 -14 1 SO SHEETS 2 2-1 4 2 100 SHEETS 22 -144 200 SHEETS ~ s:> (fl 0 ~ ..p. ·-:i ~ () ~ 0 ... ~ .... ('V ~ !g.. to (J\ l: 0 ,..._ t -:i ~ C> (> . t0 t- t-- f) ,, VJ (}} (J) 'D' .. (ft ,P f) ~ :~ I Im · ~ l ~' JV i ·~ '-· :r:: ,(Il l ..:;/ ;'f; +. '~l ,_,. (n ~I , ~.s ~ ;>' (0 ; ~ ~ ..0 I I " ~:i'~ .... ( .,,.,,.,, ............ ......... ......... ::c::c::c .,,.,,.,, 000 11100 -N ; C.of<\PUT1+TroN or= FLOW CAPACITY OF 0uTL£T U~/:\IN AGE ·_, Sw~Le. . i="R.C)M NEW 'PAR't<ING !l.~iREA '-_: . - L DiThe'r\sloY\6 , oP-ou±-1..et-J-ro..i~~e £:>wol.e. (4~ l. siele sL>-pe ~ ~ . -e:~ta..e.'(" -the.. ,eo-.~~ crvtc,\t. .shown. \oel..ovJ ...... I () C/) C/) uww ca: a: ~<(<(a: ::> :::> :::> w ~&5&5::! 0 LO LO LL I I I I () C/) C/) C/) • -1-1-1-uwww uwww c ::i::: ::i::: ::i::: () C/) C/) C/) ~888 ,... Cll Cll I I I I 0 <D,....,.... :? (') (') (') ~~~9 :? (') (') (') f--w :E 0 () . ~ 'o ~~~~n L~~n:.__..,,,~""-'Y-f~"""'-'-V\_.,.~._._ra ...... _ n.__.,_ -t-----------~• . Colc..u..\....:bi'on..5 __________ Q~·-~9:iL~~----d~Z-sz,IOe.:r ~;1'1_'[7__,__-_--__ ; C...s. ffi9UJTl+Tr~NS ILLUSTRATING.:. ~-t;t,DJG b.a71JETENTI.al Cf'tFACI:T)_ -~U~off'~~~~~~~~~~~-'Lti~~'L _ t-~ __ .... ~o'<\c::U .~ in _ . _ . _ ~ p _or .,..1;...1,&'CQ. __ ... ±:L:!;ne __ u u..t et=. £;: evq...,t-10 n,_ __ I\, C.o""''P~ Vo L~VV\e ~ ~u.1ic ..fee..t-1 .'<'e+°'"~V\ed, bj ,-the .fo~iovt_m-.?.~ "?°'\f''K\n~ l.o-t;: ,;d; o~ be.lo'-"~ ~-of CMt'b el.evo±tolf\. Cl± t:J.ie.. +.Low cu±Let---y<?i'Ctb o.P.. th~ ~'0¥-\lf\J ,_Lo~, 4!,e, J · TF6C /EL _1. 75. 11'"'"----~--------+----t-·-...... ··-.. --· '. .. -1 : __ _:__ ;__ ~ . l t---- . .. --r- ·--:-·-j-t· ' . ~----.......... ....., --· -~1--· -·-r-;--·-:--r -·~--~--·; --·-·· ·, -. ~ ' ' . ... ._ ---------~-·-.. L. •. -· -~ ·•· i- ' I : : I : I I I i I I I I I I I ' ' ' I I ' l i I 1 , s;0rR Et.Jn .. _ot= Klbit ?PA:8ixtJ:S-1-1ir1 :_+ ·_ _-; -.:-v-.<J~1_-~·~ .... _, -~ --· . : .: C,0 co.le :_ 1 •I ::. 2_() '· . . -j<; .:JO I ~ ~~CA o~ --po..'<'K iii\~ Lot-c..±-a<' be-l.,w EL.7.'75 (see s~JeJ C1'.'<'eA.iV\~·~""-'<'e. oJoave \ . ___ _ . (\ I II ' . T U. .. }f' Y\. o.., 'l'o v...vv:J.,,, °'. '0e.a.. : S fu, )<.. 2. 5 -flt-. = .'. · ~eYV\.o..iV\i~ -n--.1'0.V\5LA10..'<' o.,'i'e.Q...: Y2.. .,.., 30 ·&·t:n< 4<;, Ft. ~ P>i '<'eD... s 1.A..b -To eo.l ~ Vo Lu,'Me "~ 'Ret:-en-blo'I\. (b~ _ o'(\ Co 11 h,,~h cu._'('b) \J okvv\e o+'-~lfL·!:-ioVL = C\.'<'ea.. ~ Cu...'<"'h "'e,'3~t- ...:: 715 .ft.2."" o. 5 ~, i. c. 5 . _g'1, ft~ G q () ~Cf ,.f?.c,, -~5'7. 5 %.3 ) 5~ 35~ Cll1~. Jr_ . n 'V'C\e ~ i?ete Y\:t:;-)oyt .fo'<" ~'l"t·ion... ~ Po._'{''(,.,{ n5 Lot-I\+ o '(" 13eL:iw Ou:trle..-t:-TDC t= Lev01.,ti on.. o en en uww ca: a: t: <<a: J ::> ::> w 6gg::i OLOLOU: I I I I " en en en -1-1-1-uwww uwww c:r:r:r n en en en ~888 ..... C\I C\I I I I I l) <O ............ :? <") <") C') ~GIGI<? :? <") <") <") ..... w ::E 0 0 _:_# --.--,··-;-· ···-~---; --!---. --... ·;--·~·-· -·---;. -··f· .. _..J _____ .,. ___ • ' . l 1 I ! ' , ' 1 j ~_.;]1[~.-~ ~J)~,· :~r :.te__t-tth~. A~-~~J ~~-i?~lo~_ ----·,.. _ _ _______ _ .,~,, 'I·, . A.;~_:-&·.sS~~(~ -N~-·oU.~w .fuW\ ~~i~ 4t- fl<:.ln>P..L f,._ of. Rebe"'*lon.1 ir.c-~ s+.~e\blume .ri..+.-I ~JoD . --1:. -· 3 S'tr CL.\., tlb . ~c.~ \, t C. .c..u..f!t. fsec _ 13. -{:\ o.S v....'ffi \ '{\_~ 0 ur L e:b F Low f=<.o VY\. ~"' K i 'f\ ~ L, t- -~"'<'Co,, bo-c¥..'tJ6..--\e'c'-~J ou±-le:tr ~~w · .::;_ (J,47 c4:> (fu'ffi., ~e-s 2. o..~ 3 o~ J°tA.V\e l ti 1'1'17 c~c~+-ioV\-5 t""<' _ S m'<'O..~ e \f o W...VAf2._ o...c.twl ~10~\N r:-.·. Q '->'£ 100 (!.~~) -o u..~low 3 s~ 1:4:ft;-. 0. <DC/ c-96 en en en WWW a: a: a: <( <( <(a: :::> :::> :::> w ggg::i lOlOlOiI: I I I I enenenen I-I-I-1-w w w w wwww :r: :r: :r: :r: en en en en gggg ~ C\I C\I I I I I lO <D ,.._ ,.._ (") (") C') (") C\I C\I C\I ~ 9999 (") (") (") (") ... w :E 0 u -/ lf .. --·---l·-·-- UJ_~-\:e ~eteX\."t;r OY\. Lo..p~cr1::J ~'<tJ_ T:Y'f\e.5 o+.-E°'rL-bl'f'e "Po.-_'(' 'K 1 l()a Lo "b . . _ . f'\ . '-..) ' ,-_ A .''~ V([)L~W\e o\f' C2-o-_po_c1~~ 'R ete.n-h-~ <'.> '(\ Vo Lu.. W\.e ~ --po.. '0¥. \ '0-'\ Lo-t-0.. 'C'e'\.. '){.. C. I..\,'<' b he-t5 \-tt- -q I ~ 4-Q ~ .-fb-, 'I-() ,5-f1.c-, ~ 4-,. '=t ~o c1.4.:ft - i3 ,_)~ e~n t\ ¢V\. Ti vne. :W ~~~·;_;;_-?:J-u -, f':i.o ~-. I . / .., &t-o'f'O--ie Vo~~e Q n.,60 I c.. ~e.-te'J\..t~t} '<L.. TTv-Ae. W~~ 6u-o-4!;Low 4; q '2.0 c.u-~ {I LCo c."P6 -b -::: .s-1n~e V~Lol/'(\,~ 4,C} ~O c.~.+1:,-, _, "'(" w /ou-t:fi 0 vv -:::... QA --Q 1.l~c..f?.S -0.,47t:..~ lf>D (i ~ow) ~~u) -------, .. 1,t, .. 3D~~o~. ·1 0'.;'ii~'_;inu..~ 1 ~·-w/aMlo~~ ·-·-·---.+.-·--·--·--