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_.. - .. ~ ~y e~. , ~1 P. G. BGX 9960 II01 TEXAS AVEN~IE TEXAS 77842-0960 E STATIGN E - ` ~,' , G CGLL A - !i _ (409}:764 - 3500 ~~ k~~ . o . d ~~ 4 September ~~, l~~o Martin Rile _ Rt . 3 8.0~€ 19 4 . . Bryan, Texas ? 7 8 ~0 2 _ RE :- GLE~IHAVE~I SUED I ~Ti S I QN MASTER PRELIMINARY FLAT IM PACT ANALYSIS . -. - _ . Deax Martin: I ..have reviewed your Impact Analysis ubmitted thee. f irst gar of September. The qualitative and historic evaluat ions you ha~re :presented do not' sufficiently describe what we nay expect to nagpen as a result of the development of this project. They need to be made quantitative. i have attached my review copy with notes. Please re v~ie~ it,` revise your report accardinc~ly. and res~ubntt for technical review. Pease re-turn my marked up e©gY with your revised ,analysis. . Since~el~,, v i /.~"' `.~ ~~.~Tlt~ ~ . ullen, ~ . ~ ._l City E neer -GC: Shirley Volk.:, Deve3.opment Coordinator veronica Morgan, Assistant to the City Engineer Jane tee, enior P~.anr~er , Home of Texas ~ & M Caniversity STAFF REPORT CASE NO.: 90-343 APPLICANT: Hank C. McQuaide for Brazoslamd Properties, Inc. REQLJ-EST:- Revised Master Preliminary P at LOCATION: Glenhaven Subdivision located at the southwest .corner of University Dr. and the East By-Pass PURPOSE: This revision creates larger lots by eliminating Carol as a through street. and reducing the number. of streets running west off of Glenhaven Dr. PHYSICAL FEATURES: Area:... 1b.65 acres No. of Lots: 53 zoned R-1 AREA ZONING: Subject Property: R-1 Single Family North: C-1 General Commercial East: R-1 South: R-1 West: R-1 E~STING LAND -USE: Vacant PRQPOSED LAND USE: Single Family Homes LAND USE PLAN: Low Density Residential THOROUGHFARE PLAN: Glenhaven is shown as a collector. In 1981 i~t was shown as a minor arterial. Carob St. is a residential atreet. ENGINEERING: water: Provided to the .area through a 16" ine along the By-Pass and University Dr. Smaller lines also exist along Merry Oaks and Francis. Sewer: Provided- to the R-1 area through an 8" line along the western:. edge of :the property. The C-1, A-P and R-3 areas are served by an 8" line running along Glenhaven. Streets: Area is served by Glenhaven Dr. and Brazoswood Dr. Drainage: Currently drains southwest intro. a tributary of Carter's Creek which runs along the back lot lines of .the R-1 area at the end of the proposed cul-de-sacs. Flood Plain: According to latest FEMA maps. several lots are .,within the 104 year: floodplain. These are at the ,end of Cresthaven and Greenhaven .Circles. Cwersize .Participation Request: None requested... w PA1~~~ND DEDICATIONa i~Vll report status at meeting PROPOSED PUBLIC IlVIPROVEME~Nf'1'S: Improvements include the extension of Glenhaven to Damnik and the construction of .the four cul-de-sacs. as well as water extensions to the area to provide service. Sanitary sewer extensions into the area could possibly include upgrades to the existing 8" and 1D" mains in .existence. There will also be storm drainage and detention. improvements on-site. IlVIPACT STUDIES: water: Adequate flow and pressure Sewer: Impact .study shows the mains have capacity, but maintenance records show. otherwise.. Staff is .currently working with the applicant on resolution. Drainage: Impact tudy does. not .:include calculations .for all design. storms required, calculation of .necessary- storage capacity for the detention pond, results of routing ,..:floodwaters hrough the pond and outlet.. structure .and :drainage area topo maps. . These items. must be submitted before approval of the ,:impact study. Traffic:... Staff is in general agreement with assumptions and. findings. Glenhaven /University intersection would not require. signalization as a result of traffic volume from this development. RIGHT-OF-WAY DEDICATIONS: Glenhaven ~6a' ROw} to Dominik. Includes 1.731 acres. Four cul-de-sacs (so' ROW each}. Includes 2.22 acres. EASEMENT DEDICATIONS: Appropriate easements will. be granted to cover all utilities.. SIDE'WAZ~S: The Subdivision Regs. require a sidewalk on one side of Glenhaven. STAFF CON~NfTS: The revisions proposed :are in compliance with the.. Comprehensive Plan and pose no problems with existing land uses. Glenhaven was..initially planned to have a 70' ROw because it was planned as a minor arterial on the 1974 Comprehensive Plan. The plans for this .street have since been changed with Glenhaven now planned as a collector. The "collector°' functional classification for Glenhaven is more appropriate because of the following:. Land Uses Served -Minor arterials: are typically designed -for higher intensity land uses (ie high density residential and commercial} than is planned in the Glenhaven Subdivision which is largely. single family. ~. ~ ~ ~ a Continui - A minor arterial is typically more continuous than:. as planned ~Y for Glenhaven. Collector streets are not ..necessarily. continuous. The overall im act of not extending :Carol to Glenhaven, as originally planned on p . . the previous plat, would not be detrirr~ental o or meonsistent with area thoroughfare planning. However, an extension would provide. better access and local traffic circulation in thin immediate residential area. If the street were extended it wauld, at best, serve as a minor collector. The future extension of Carob from Westover to Munson would allow fora "better minor collector", but -thin extension is -not practical due to existing residential development. Lincoln, Francis, Dominik and University oaks are the existing collector streets between University Dr. and Harvey Road which provide east-west movement between .the By-Passe and Texas Avenue.. Therefore, the impact on the. thoroughfare system of this small extension of :Carol would be minimal. Drainage impacts must be addressed. Staff recommends approval of ..this revised master preliminary plat with the condition that drainage impacts are adequately :addressed. w.u = °... .„.. ss ~ t ~ r _ „. .;. E .".... ~ k f ~... as :.~~ .., !"•i s ~ # ?::~ sa i,°= ~ # _ ~ ' ,~. 3 3 3' ..: # # ~,a ~" ~ ~;,° E, ~ 333 '# ,E .. ~°,. _. "} .Y, .. .,..,. a #. #' 3 ~~ ig.ii #~# ;: ° N;= ° ,~ # # 3..~ 3 ~ ,°.r 3 # fl "°s .~. ~., i.:i ~"# : fi ~°.? # ' ,~° .~ ,~ 3~.t~, ~c 3"": ~..~ .~. 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'.; # ~..3 ;: #..# ~ ~°~ ..... , r . _ ~'~' . s '~ .., gg s •. r;3 E E E.,,f ~ # ~ ~ _ ~. _ ~ a ~ H' { P.. 3 3 "~ s e 3 `'.. .. .. ~ „! ~,.. . ~ i $., , , .s, ;..F 3"' 3„.3 ... ~.....'~ :'r as ,°~ _ : ., ~. 3 ...... s # ~~ ? ~~ ~ s ~..~ . „~. # # °»~ ~° i.°# .~.'.... ~' :: s„~ ~, a 3 ~ ~ AA ,~ } r t r `".r ~~ i ? ,S 3 ~•B 4 ~s '~ .~.. .~ 3 s s ~ # ~ «~ { # s " . j _ 3.. ?w. ,~.. , # Q..3 ?~ : 3 4 }{ ', a } s i. ~::~~:,! •~„ ~ ~~3 3»} : ~ ~..:"~ .~ 3°'"i ~ ~..3£:.° ~~.~ ~"" 3 3 ~':.3 .~. 3.:"s~€~ ~R3 ~:3 ~ .1::si"~ ~::3 #.3 '~a ar ° ,„ .. °.. ,: ` FILEN'~TE DLK PLNfVI~VG DIVISI®IV Post Office fox 9960 110 Texas Avenue ~ - College S ation Texas 7782-0960 X409) 764-357a MEMORANDUM TO : Veronica Morgan,. Assistant to City Engineer FROM : Edwin Hard, .Transportation .Planner ..DATE December 21,1990 RE : Traffic :Impacts, Glenhaven Estates Master Preliminary Plat I have ....reviewed the traffic report. on the above referenced.. plat and I am in general agreement with its .assumptions and findings. I should also note than the extension of Glenhaven Street to Daminik as shown on the plat is in accordance with the City's Thoroughfare Plan. The report assumed 12 vehicle Grips per lot to estimate the .daily site generated traffic. The ITE trip generation :manual suggests 10 vehicle trips .per .lot while an 0&D study I was .involved in ' earlier this year resulted in an even. smaller daily .trip generation figure for the characteristic households in question.. I am also in general.:-agreement with the directional distribution of trips applied in the .report and the statement. that the Glenhaven/University intersection would.. not require signalization as a result of the traffic. volume generated from this development. At some point in the future this ~~ ..intersection could ..warrant a signal which,. in turn, would create a ..spacing problem with the signalized intersection at the East .Bypass. ~..• - , o~ •. ~~ . ~~ ~~. ...___. ~ .-_ . .... .._. ~, 1 ff~'~~~ _ ~.5 ,~ ~..w { ~~ ~ ~- ~ ;• . . _ •~ ,. :. ,. . ... .{ ~._- - .. ~^ ~ f i '~ , M I r. ~,, i ~. !~ ~ ' t~ f1 ,~ ,, -- ; _ ~ ~ 1 r r 1~ .,~ , ~ ''+i ! , ~ i t `` ,, 1 -r . ~ k 6 ,~, . ! t „` + r~`".~"'-r~~p.. ~'~~ d Vic' t j ~ ~ ; 4 ~y ~n { i .~ ' :..~ r t'`~ ~l ~ 1t ,. t 7 y, t ' ~ ~'1 ri 11 ~ ~ ' ^I 2 } 1 + ~ y ~,6 ~ i ~ ~ ' ~7. s!~ `' ~ t- / ,~- ,rot '~ , ~ '~_n i),ef~itRT' ,-.:- ..i~L---1-es .i'.r~ t 12 ~ ~ ' ~~ ~~ ~ ~ ~ ~ ` ~-- ~_ oAxs Daly{ -t~ ,,, ~~ / (t • t ~ Y~~ tY I ~ . ~ ~ ~T._,~...~-~~, 4 '~-~-~r-'a"_'.-- _ •- _ ~' naRer R;~- 3 ~ rt _ " ~RP`~ ~ / 1 j t ~ ° tl Ij ' 13 tk ' ~,y i K I i2 } I cj io , ' i i { ~ ~ ~ ~ ` ~ t1 'w'~Z it4 Mi`{ c-=.~ ~ `,~I 1 w ^t 2 •. ry J ,. S C t ~,o~l+. t. 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I{!r I .I -Y~~''~ ~•.~ :~' o p ~ .. .. 5 '' is ^~'~a ~~ ~,^„' r r '1?s` y, `~ T7 1 , i ., r M. O N r .. r ~I rkt i,µ~n"'~wy p5 l f '< t ''r a t y.. °J 4' r ' p 3 J 4 ,vS. ily Jtdlr~I:tht ~ °; ~` ~ ~, -3 \ i _ Il'1~~1 r~ ~ ,~' a 11 r ti 1 (b ' ~'~ a } Y ~E~ T~ FiL~ EJECT . l ~nhaver~ u~d i ~ i ~ i ~~ pit 4~°5~~0 ~rti~ ~3y ~~~ t~ tie ~f~i~ce a~~ yet ~itl~ ~'~r~r~i+ca ~ar~.r~, Jana ~~ a~~ m~. Aft ~r hear i n t e r op~~ ~ add i t i ~~~ ~ i r~, ~l~r~~~d f ~r t h i s ~u~~i~r~sior~ t~ -fob ~~i~ r~u~rem~~t ~r~ ~ite~ t-y staff ; i i, unit a has er ~'r~li~inar Flat fir the y cnt ire ~ ~ub~i~xsi~~, in~I~~i~ the ~~i~te~ ar~~-_th~ r~~~se~ sect ~~~~, ~t e~~~~~i~ the ~hur~ a~r~a~ are the City pr. i ~. i~~~~ tu.i~s gill b r~uir~~ ors ~h~ area ~r~~ F~as~ 'IL ~~ut~ to o~i~ ~it~ tb~ ~F, t+~ in~lu~~ the ~1 ~nl~a~~r~ ~r ~e ~~~ ~r~~ i an , i 3. The ~o~~r~~l aria are ~ A°-F aria ja+cen~ to t~~ ~~p~~~- ~hou~.+~ b~ r~c~r~ ~~ t ~i s OFF, ~t ~°i l l nit ~~v~ t a ~e i ~~l u~~ n t h~ i ~a~t s t u~ ~ ~~ f ~r t ~~ OFF, Wh~r~ som~n i rid t~- ~v~l t~as~ ~ra~ts, a Fr+e~i~in~ry ~~ Flat 'will ~e r~~~~red ~ will i~~lu~~ t+~ i~pa~t ~' studies at that t i~~, i AGENDA ITEM COVER$HEET ~~~~CITY OF COLLEGE STATION ~ k ,' ~~' V 1, ,; 1 R x ~. ~ TITLE SLIDE ~ - t ' ~~_.~' j ~- REQtJ-~EST: Revised Master Preliminary Plate .SAM .SLIDE ~ ... LQCATI~N: Glenhaven: Subdivision located at the. southwest corner of Unlverslty Dr. and the East By-Pass PURPOSE: This revision reinstates... prelim:..: plat :which has expired and also creates larger lots by eliminating. Carol as a through- street and reducing the number of streets running west off of Glenhaven Dr. .. PHYSICAL Area: 14.:65 acres No. of ots: zoned R-1 ;. _ ., ZONn~TG: \ ,\ ,, Sub'ect Pro er : R-1 Sin le Famil J p g- y North: C-1 General Commercial East: R-1 South: R-1 . West: -1 EXISTING USE: cant i PROPOSED ~ USE OF TRACT: Single Fam11y Homes I~A~IVD USE PLAN. SLIDE LAND USE PLAN: Low Density: Residential ,- TH4R~UGHFARE PLAN: Glenhaven is shown as a collector. ~~~5~~~ '~~:-~11 other streets are residential. ,; ,.: „\ IIVIPA~I' SLIDE ~,~, Water: Adequate flow and pressure. :.Provided to the area through a 16'' line along the By-Passe and University Dr. Smaller lines also exist along Merry Oaks and Francis. Sewer:: Impact study shows .the mains have capacity, but maintenance records show .otherwise. Staff working w/ developer. a Provided to the R-1 area through an 8" line along. the western edge of the property.:.. The C-1, A-P and R-3 areas are served by an 8" line.: running along Glenhaven. Drainage: Prelim. plat. does not address drainage concerns but pond ~ locations .and easements will be reflected on final ~p1at. May 3 result in changes in lot ine locations, but staff feels 1 comfortable continuing w/ prelim. plat: a ~ ~ I Impact study does. not include calculations for all design ~ '~ storms required, calculation:: of necessary storage capacity fer ,, the detention pond, results of routing .:floodwaters through ~ ` the pond and outlet structure and drainage area topo maps. `` ~-' These items must be submitted before a royal of the pp ! ' impact study. Currently drains: southwest into. a tributary of Carter's Creek which runs: along the back lot lines of the R-1 area. at the end of the proposed cul-de-sacs. Flo Plain: :According to latest FEMA maps several lots- .are within the 100 year floadplain These are at the end of Cresthaven and Greenhaven Circles. Streets: Area is served by Glenhaven- Dr. and Brazoswood Dr. Traffic: ~~ Staff is in general agreement with assumptions and findings. Glenhaven /University intersection would. not require signalization as a result of traffic volume from this development. ~\ ~~` .f r, ,,*, lrVlYllVl~l~ 1 ~7 ~L1L~r ',~ ,~ _- • The revisions proposed are ~n compliance with the Comprehensive Plan Poses no problems with existing land uses. As mentioned Glenhaven shown w/ 6~' ROW as street has been changed to collector since previous prelim. pit which is more appropriate because of: Land Uses Served -Minor arterials are typicall desi ned for hi her ~' ~, Y g g intensity land uses {ie: high density residential and commercial) than is planned iri the Glenhaven Subdivision which is largely single family.: Configuration and Continuity - A minor arterial is typically .more continuous than as planned for Glenhaven {going. only from Univ. to Dominik). Collector .streets are nat necessarily contiguous. The overall impact of not extending.: Carol to Glenhaven, as originally ..planned on the previous .plat, would not be detrimental to or inconsistent with area thoroughfare planning. Ark extension would provide better access and local traffic circulation in this immediate residential area but w/ existing collectors Lincoln, Francis, Dominik and University Oaks providing east-west movement between the By-Pass and Texas Avenue, :the impact on the .thoroughfare system of this small extension of Carol would be minimal. STREET NAMES: Brazoswood Circle to Drive SIDEWAZxS: The Subdivision Regs. require. a sidewalk on one side of Glenhaven. Staff recommends approval of this revised master preliminary plat .with the conditions mentioned.. {drainage impacts are adequately addressed, Brazoswoad Circle. be changed to Drive and sidewalk on Glenhaven). ~'; ``~ ~, `, ,, .r t ,~ _ . ___ . ~....a. ~: '4 4" ,. , ~_ ~ , ~ - - ~ .« .. ,g 9 ~ ~ ~~ .... 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I , V' ~''~ f r ~ " ~ f ~~ '~ ..+y ~. ~rp ~~i-,~° ~7'~ i.H q~ A'y .l~` ;9'~~~ ~,w.rs'. ,t 1 a .~+`"~"'y~ ~ .. h . ~ ~ . f ~ - ~} `~ ~~? ! :J~~ r `^ CDe:.r6 f V~ `r^'~. ~ "s4 ~"~-P.+~.. ~,H #M4' b~~ 'f~ %'.~ .x _(~ b'"''~ ^ ~ M- ~; ~ ~s .~ ~. -~.` ~ ~ - d ~ Y ;.~ ~, ~ ~~` _ ~ ~ 3~ A {. 1 ~ ,l r "' l/' c.J~ t r,.:~~"4;; >i4~,~ ~. y~?~,..1~. ,.~.' kc..', ~ ~rl~. ;~ ~,f'j i ~ Jf. .o i s A r ~" 4.. `~ ~ r ~X ~ `~', / ' ` ~ ~ di C. ~ ~~ ~~ ~ ~f' Y ,_!' /.,, p- o~ D X r .. .li l~ l l 1 !J ~ 1 ~~ ~ • tq ' /~ r N r ~ 4 (tt ~~ m ~ ~ ~~ ~ ~, ~ ° ~~ ~ l ~ ~ ~ ~ ~ O~ tuZ l ~~ " ~ c . ~ y~ ~.. ' JO LINE ~~~ ~ n ~C W_ r b 0 r `/ ( ~'l ~ N ~ '`F 'q '~ ~ ~ ~ I ~ 9~ y~ .~ ~~'fi ~~ y~ m ° ~~ ~ ~ ~! V s ` _ s - ~ s,, ~~ ~9y ~F~•c~9'~~ ~y c+~ ~,~yy~` ~ Z „~ ~ r 0 0 ~ d ~ ~1i W ~ ~A ~ `, ~ ~ nj C~ . D ~ ~ ~ ~` ~- QgsoG~` 4 L ~ ~ 0! .O ~ Rl .~ o Z ~ W • n ~y~~~~~ o Fo Fo , , i ~ A ~ ~wa fFRNNAVEtY ~~ y ~ V ~ A ~ ~- CIR. ~ ~ (/~ ~ ~ ~ ~ ~ ~ M .~~ ~° ~ o~ ~ a y ~ FRANCIS DR .~ .. F. ~ qy ~ ~ ~ c/ ~ G~ a ~ e.,~ ~ ~• ~ ~b ~ ~ b ~ . V~ ' ~ ~ + C~ t+J ~ ,~ n h Z ~ y' :~ ~ R ~~ '~ C~ ~~ i~ . b ~ ~ I O ti ~ . tv W •~ ~ ~ o ~ ;+~ H A~,~ ~ . ~t m CSR, ~ •`V . '1, '~ 4 aRazoswooa z . . ~ y _~ ~~~~ AR L S. ~ yy .~ ~`C b 0~ ~ ~ ~ I GIENBR00K ClRG~f ~~ ~ ~ ~ .(n ('~ W 'C' . •_ ~ - y - -~ b ~ y ~~~ Z ~ _ fl E H ~ o ~ ~ , ~ RE l NHAVf CIRC~.E ~ ~ ' n ~ ° ~ ^~ ~ '1 o ~ ~ ~ o. --_ ff., d ~ ~ y .. ,~, ~ o ~ . c ~ ~ ~ ~~ ~ ~ .~ q '~ ~-~ - -- - + ` CRESTHAVEN CiRCt.f ~~ a ~ ~ '`~ ~ y 'Zj ~ ~ ...... 1.TI3AC. -~ d y a aMi~~~x pR~ v~ WATER LINES 3Nll«01 __ k Q ~: m~ o~ v~ ~~ ?~ ~, W ~.. W J ~. ~~ •, b ' b N ~/ • y y ~N~ N ~ ~~ EXHIBIT 2 TRAFFIC MASTER PRELIMINARY PLAT GLENHAVEN'ESTATES COLLEGE STATION, TEXAS The development of the 14.935 acres-tract in single family residences on the loC sizes indicated (approximately 53 lots) can the Revised Master Preliminary Plat will not create an unusual traffic pattern different from that observed in other subdivisions of comparative size. This area is, or.wiil be when construction of the Extension of Glenhaven Drive is completed, served with an unusual number of collector streets to provide for access to the major thoroughfares. Glenhaven Drive will connect Dominik Drive with University Drive and will provide an excellent east/west- access to the major streets. Also, Brazoswood Drive will provide excellent access to the frontage .road on tie East Bypass. Francis Drive will provide access to the schools and other areas to the southwest of the property. There will not be a large volume of traffic generated in the area due to the fact that it is a residential area and has no large traffic volume. generators planned or for that matter, sites provided for such generators. The close proximity of the Richard Carter Park and the proposed Church Site will limit the .traffic generated in the area .during. times of peak .travel. ~ The volume of traffic generated in this area will not require the installation`of any traffic control devices other than. stop signs and speed limit signs. The exact number of vehicles per day cannot be determined at this time due to the fact that the dwelling size, income range and family size cannot be determined. Later evaluation of the site after construction is complete will ~;ivc a better feel tor_ tl~c traffic volumes generated, ~- C .SLR-t. ~~j /S ~j ( S E EXHIBIT 3 ) / ~ ~ ~ J G l S Q~~St~ 1~ ~ P~~~~~ ~~f EGA , n ~-~~~~'-~- l~ °~~ ~ Zv ~C3~i slC ~ ~~ ~~-~[: ~1-~c ~ ~ ~a~ ~'! ~GC.s ~j l ~ ~'lls ; ~b DRAINAGE ANALYSIS REVI5ED:MASTER PRELIMINARY PLAT GLENHAVEN ESTATES 14.935 ACRES COLLEGE STATION, TExAS The attached Drainage Analysis dated September, 1986 and December., 1987, w-ere prepared for the Extension of Glenhaven Drive and were intended to give the runoff quantities needed to design the storm sewer and inlets on the proposed street. The September, 1986 calculations were based on a 5-year ~`requency. The December, .1987 calculations '~ were based on a 25-year frequency. These drainage calculations can i ~ be used to give the total runoff entering tihe 14.935 acres tract with ~ the exception of the portion of Glenhaven Estates, Phase II, that lies northwest of this tract and drains into the tract along the small creek. The x~:unoff from this area of 5.10 acres is calculated ? in the same manner as the other figures for a total of 25.49 cfs.' ~~ This figure, when added to the runoff totals from the Drainage Analysis.- attached give a total runoff entering the 14.935 acres tract of „ ? 13 9. 7 8 c f s .' /,) ,~ ~m~,. ~c-.' c~°tP mot` ,fir The runoff .from the 14.935 acres t t can be calculated in the same manner to'gve a total of 74.65 cfs. This figure, when added to the runoff of 139.78 cf:~ from outside the tract, give a total runoff at the 2-48" RCP under Domnik Drive of 214.43 cfs. There is a small creek that enters the property from the southwest that contributes approximately 100 cfs for a 5-year frequency. Adding all the runoff figures together gives a total at Dominik Drive of 314.43 cfs. The capacity of the Z-48" RCP on a 1.00% grade would be approximately 310 cfs. From this, we can see that the: pipes are adequate for a small frequency rainfall but would not be adequate for a larger frequency rainfall.. In this event, the water would spill over the roadway and into the creek downstream. More detailed analysis of the area at Dominik Drive would be needed when .the time ar-~:ses and the construction of the streets and storm s wer b 'ns ~jJ ~j~ ~;~-~~(~ /; i s ~r ~~~ ; ,~ GZ~` `~re~~~~v ~ 5 ~ - ~ ~ ~~ ~ ~ ~ P ~ y RILEY ENGlNEERiIVG C01~lPANY/Route 3 Box 457 /Bryan, Texas 77801 /(713 589-2457 RUNOFF FROM OUTSIDE SOURCES At the resent time, the runoff from the west .part. of Glenhaven p Estates, Phase II, tArea shaded red on attached p]an~ is co~.lected in Woodhaven Circle and: Oakhaven Circle, carried to Francis Drive and then. into the Existing Glenhaven Drive, where it then flows southeastward in the southwest half of the Existing Glenhaven Drive. A-~ .the end of the existing pavement, en Brazoswood street , the runoff flows into an open ditch and is carried toward the existing ~cr~ek. The .runoff from this area of 5.11 acres is calculated as follows: Compute I .._. t =10 nnut es Assume : 1. ,5 acres as paved ~ 3.61 acres as residential I 6 +g •~ tlo •5) ~ -- o 6 I 'x.69 ln~hr. R _5 =CIA - . 5 o. .~6 ~1~5) + X0.6) X7.69) 03.61) 5 Q 10.3$ cfs +14.66 cfs 5 Q 2'~ . O~ .c fs 5 _. This total runoff o~ 2'~ .0~. c fs is divided when it reaches the existing vane utter on Brazos~~;ood ~'treet. Approximately 75 ~ of the runoff Y g _ a on total or 20.28 cfs flows, around the corner and Into the ditch 1 g the future al ment of BraZOSwood Street.. ~ When the censtruc ion plans on Braz oswood Street . are drawn, inlet boxes and storm sewer wily be designed to take part of the runoff from the street to~ prevent flooding. The other 2 ~ of the runoff or 61'6 c fs passes the .intersection and _5 . flows down the southwe t curb lihe of the Extension of Glenhaven .Drive. At the resent time the runoff from.,..: a .:part of Phase V around Franci p Circle a art of the undeveloped Phase VII around-Springhaven. Circle, p the northwest half of the existing Glenhaven Drive and ,.part of the exstin Brazoswood Drive, flows along the northeast curb of .the g existing Glenhaven Drive (to the~end of the pavement and then flows across the undeveloped right-of-way and down the Future Glenbroo~ Circle in an open ditch to the creek. The runoff from this area of 3~2 acres is is calculated as fchows: Registered Processional Engineer Number 50316 Mar#in 1. Ri{ey Jr. Registered Public Surveyor Number 4089 "~_ 801/(713} 589-2457 s 457 6 T 3 n ut o R , e a R1LEY ENGiNEERtNG CO~PAHYL 77 B x exa / rya , C omput e I As s um . ~2 a s a av ~ 1 cre s p ed _ ~. 2:00 acres as residential t - 10 minut ~; c C -0.9 p I .~ ~6 5 ~ ~ .- o . 6 R 0 8 10 +8 . ~ 5 C 5) 7.69 n.~hr. 5 Q = c r _5 ~o •9) ~'~ •6g} ~1.~2} ~- X0.6} ~~.69) C2.oo} 5 Q - 9.83 ~ fs ~- g . z3 c fs 5 Q 18.06 cfs 5 This.:. total runoff of 19.06 cfs flows into the undeveloped right- of-way of Glenhaven Dr,~ve at the end of the existing pavement:. After the Extension o~:~ Glenhaven Drive is. complete, the runoff will be carried in the northeast half of the street toward Dominik Drive. COMPUTE THE CARRYING CAPACITY OF TIDE PROPOSED STREET -SECTION The carrying capacity of the northeast half of the proposed street secaion (39-feet B--B } is calculated as follows Sta 1$+12 slope = ~ - } 0.8~ ~ n _ 0.01:3 ~~~ A=1~,~~ sf o.s` ~ WP " 19.E 51 ~ • ~9~°1 R - A~W~P ~ 0 .:235 Q~ l• ~+8 6 2/3 1/2 A R 2/3 R ~ o. 3 8g g s n s~ 0.Oa8 Q ^ 1.86 ~ ~ o . ogle } ~ ~ 75) ~ o . 38gg ) 1~2 s ~ o.0g1'~ _ ~o .013 Q=19•~l cfs from this `calculation, we can see that the northeast[ hal f o f the street .will be approaching its maximum... carr~ring capacity at Sta 18+12 Therefore, we will install curb inlets and storm sewer ta,remove part of the runoff from he street. DESIGN OF INLETS at STA ' 18+00 ' The inlet to be placed at Sta 18+00 on the northeast side of the proposed street should be '~a single recessed inlet with: 2 extensions . Aegistered Professional:Engineer Number 50316 Mar#in L. fliley, Jr. Registered Public Surveyor Number 40E9 _2_ r .~~~ - - -- ----- RlLEY ENGLNEER~NG COINlPANY/Route 3, Box 457.1 Bryan, Texas 77801.1(71.3) 589-2457 Using the following formula, we can compute the inlet capacity: 2 ~~2 q .. ~ _H where. a = 6 1 x ~ 1 y~ - 6" l 2: H a+y ~- ~ t en h L 1....15... c fs per foo of 1 gt H - 1 1~ x ~0.5 2 Based on thene calculations we can see that, 15 feet of opening will interc e t a roximatel '~ 25 c fs allowing approximately l , 81 c fs p pp y to carry-over. The i e connectn the inlets must be capable of carrying at least p p __ g 17.25 cfs when flowing full. ~ From Figure... 5, Page 1$2, of the Concrete Pipe Design Manual, we find that a 2~-inch RCP would be needed and would have a carrying capacity of 2~ cfs on a l ~ grade. The inlet in the northwest curb return on t~lenbrook~ Circlecan be a sin le inlet • The floe in ~the:.southwest ide of the Proposed g Glenhaven Drive would be approximately 7.5 c.fs (~.• ~8 cfs + o • 72, cfs from the street] This runoffwouldturn. the corner into G3.e:~~rook ~~ - ~. and a roximately 80 ~ or 6 c fs would be carried away from C~.~~cie p~ the inlet In a 2~-inch RCP... storm sewer o be constructed in the future . The remainder would flow:- down ~lenbrook~~ Cireleto the :creek The total for the 2~--inch RCP flowing out of the single inlet would be 2 `.2 cfs. A: 2~--inch RCP on a l ~~ grade will carry 2~ cfs. The 3 ,5 ,, preliminary grade onGl~n~~rook ~~rcle~ is In excess of l ~ so we would be safe in 'assumn that the future storm sewer c0uhd be laid: on g a 1 ~ g~a,de . COMPUTE THE RUNOFF FROi~ THE PARK AREA CHURCH SITE AND RESIDENTIAL AREA .~. T rom the` Park Site tshaded reen on he attached plan} he runoff f g will flow into the northeast hatf of the Proposed Glenhaven Delve along the entire frontae. The total runoff from this area of 3.72 acres is computed as .follows: =CIA where: I ~ 7.69 in,~hr. 5: ~. Q = X0.27 ~'~ •69~ ~3•~2~ C =~ oz 5 . . ~ = 57~ cfs 5 The runoff from one-half of~the~proposed street with an area of o , 25 acres adjacent to the Park Sate i computed as follows Registered Processional f~gineer Number 503.16 Martin L. Riley, Jr. Registered Public Surveyor Number 4089. _3_ RILEY~ E dGIMEERtNG`C~~NPQNY/Rou a 3, Bax 457 /Bryan, Texas 77801 /(713) 589-2457 .Q = C' TA where : I _ 7.69 in . ~hr 5 5 ,. Q - (0,9} ('7.69 (0.2.x) ~ = 0.9 Q 1.'73 c~'S 5 i , The total runoff from the Park Site Area would be 5.'72 cfs x-`1.73 cfs for a total of ~ . ~.~ cfs Ch rch ~'to .shaded brown on the attached plan} The runoff from the u 1 will flow into the northeast half of the Proposed Glenhaven Drive alon the entire .frontage . Although the ite wild. probably be g develo ed with buildings and parking lots that will channelze the p runof into the street at robably two: points, -we will only consider .~ . the overall p cture at this time, Any Increase In runoff due to construction-will have to be retained and detained through the use, of on--site structures and ailing plans. We will consider the urea ~' , as being developed in order to ca3,culate a runoff quantity to be used in the design of the storm sewers The .total runoff from this area of 9.00 acres is computed as follows: C A ~ ~ where : 1 _ '~ . 6g in . ~hr , ~ I s Q ^. (o •75) 0:7.69 ~9 •oo~ ~ - o •'75 5 Q -51.91 cfs The `runoff from one-half of the proposed street with an area of 053 acres is calculated as follows: =CIA where: t = 6 min, Q ~ . 5 -- 0. ~ I = 9.31 n.~hr Q -~0.9~~9 31}~ 53) 5 ,. Q = ~•~~ cfs ~ ~ = 0.9 5; The total 'runoff from ~~~l~le ~hureh Site Area would b`e the 51.91 cfs ~ ,'~F~ c fs for a total of 56.35 c fs , The runoff'frorn the Residential Site at the intersection of the Pro osed Glenhaven Drive `and Domnik Drive (shaded yellow on the p attached an7 will' flow into the northeast ha1#' o'f the propo ed p street and then in a northwest direction to the low point in the street. Thee runoff from this area of 0 , ~5: acres is computed `as follows C IA where : t - 6 min. ~ c 5 .6 0 . ~ I ~- 9.31 in./hr, 5 Q = 2'~2 cfs C p,6 Registered ProYessional,EngineerNumb~r 503x6 Martii~ L.. Riley, Jr. Registered Public Surveyor Number 4089 -~- RILEY ENGNNNrERNN~G CO~d9P'ANY/Route 3, Box 457 /Bryan, Texas 77801/(713) 589-2457 -The runoff from one-half of the proposed street adjacent to:th.e residential site with an area of 0.08 acres is computed as follows: Q =CIA where: t , ~ min. 5 ~ 0 . 10 . ~6 .0 . C$ I = 10 , ~6 i n . ~hr Q C 9}~ )~ } 5 5 Q - o . ~5 cfs C 5 ~ ~~ The total runoff from the Residential Site would be 2.'~2 cfs. 0.75 cfs for a total of 3. ~'~ cfs We can determine the runoff in the northeast half of the Proposed Glenhaven ~ri~e b fading the runoff that enters the street from ~' the adjacent drainage ~~~eas. At Sta 18+40 proposed lisle } w~ have 1,81 cfs of cart -over. At the common line between the Park Site y and the Church Sits ~Sta`20~00} we would have all the runoff from the Park Site 'added to the total or g .26 cfs . At Sta 23-~3'~, vie will have a roxmate3 0,2 of the total runoff from the Church` pP _ Y Site (11.2' cfs) in the sheet added to the runoff total at Sta . 2000 (9..26 cfs } for a total of 20 , 53 cfs . We will install a recessed • e et 1, eaving ~.nlet with 2 extensions and take 17 25 cfs. out of the str a cart --.over of .28 cfs , At Sta 2~+8'~ we will have approximately 3 0.~ of the total from the :Church Site ~22.5~ cfs} n the.Street for a total o f 2 .82 cfs ., We will ins ta11 a ,recessed inhet with 2 5 extensions and take 17:..2.5 -:;cfs out of the Street leaving a carry-over of 8 . cfs . At Sta 26~-3'~ we will have: approximately 0.2 of the 5'7 . total runoff from the Church Site ~ 11.2' 'cfs } for a total of ~.o . $~ cfs. We will install a recessed inlet with 2 extensions and take 1 .2 cfs out ~of the street leaving acarry--over of 2.59 cfs . At 7 5 . the lowpo.nt of the Street.. at Sta 2~-~87 , the remalnzng 0.2 of the runoff from the church site {11.2 cfs) will be in the...Street~and the runoff from the Residential Site ~ 3 .~'~ -cfs } w11 be flowing in from the southeast and added to the carry-.over of 2,~~ cfs:;gi~es a total of 17 3 cfs. We :will install a recessed inlet with 2 3 extensions `and allow all the runoff to 'flow from the Street. DESIGN OF THE ST ORIVI SE~1ER The storm sewer i e be inrin~ at the proposed inlet at Sta 2:3-t~3'~ p ~ ~, - . -.must be capable of handling' the anticipated l'~.25 -cfs that w1~Ll enter the i e throw h the inlet. The slope on the proposed pipe pP g will match the ~--) 1.57 / on the proposed: top of curb. From :Figure Pa e 18:2, of the Concrete Pipe design Manual, we find that a 5, g 2~-inch :RCP will be necessary to handle the- flow. The capacity of . the 2~-inch RCP is approximately 30 cfs . s wet i e leavin the ro osed inlet at Sta 2~-~8~ must The storm e p p g P p be ca able of handlin the 'x.25 cfs entering from the 2~-inch p g RCP u s ream and the l'~ . 25 cfs intering through the inlet for a total p of ~. 0 cfs . From Figure. 5~ ....Page 182, of the Concrete Pipe Design ~ - ~: '. • • Manual, we fend Ghat a JO-inch RCP will be necessar~r to -handle the Registered Pro(essionaJ Engineer iVumber 50316 Martin L. Riley Jr, Registered Public Surveyor Number 4089 - -- .~. - _~_ RItEY ENGINEERING CON~P~N`Y/Route 3, Box 45T /Bryan, Texas 77801 /718) 589-2457 flow..: The ca acit o f the 30-inch RCP on a (-) 1.57 f grades is p y approximately s2 efs . The storm sewer ipe leaving out_of the proposed inlet at Sta p 26+37 must be capable ofhandling the 3~.'~0 cfs: in~tering from the 0--inch RCP u stream and the l'~.25 cfs -entering through the inlet 3 p C rte .,for a..tonal of 53..9:5 cfs From Figure 5, Page 182, of the. one e Pi e Desi Manual, w~ have determined previeusly hat a 30-.inch p ~ RCP on a ~ - ~ l , ~~ ~ grade will carry approximately S2 cfs , There- fore a 30 --inch RCP ~vill be adequate , The storm -sewer leavi out of the proposed. ~3n1et at Sta 27~-8'~ must be capable of carrying~ the 51.9 cfs..entering from the 30- inch `RCP upstream and _~~~ne 1'~ • 33 cfs entering through the inlet for a dotal 'of 6 .26 cfs . From ~ re 5, :Page 182, of the Concrete Pipe 9 .. . Design Manual, we find that a 36~nch RCP on a 1.00 o grade 3.s ea ab e o f handln a roximatel ~'0 c fs . Therefore ,, we will us e p l g pp a 36-inch RCP out of t'he inlet and acro s the proposed street, ~: throw h the ro osed sin le inlet' on the southwest side of the g p p g Pro osed S reet and for a total :distance of 5 feet beyond the p southwest ri ht-of-way line at which point a ditch will be constructed g a on the south.- to allow the pipe to drain to the exlst3.ng creek 1 g west property line ~ approximatel~r X20 feet } , The 6-inch RCP -will be included in any ~`uture aevelopment pl~~ns 3 for the 1'~ . '~~ acres: tract. There will be no~. need to regain any of the runoff on~site through the use o f s ecaliz ed drainage s ructures b.ecaus e the ncrea~> e in p a t such methods , runoff at this time is not large.., enough. o Warr n If .the Church Site and the Residential Site are developed in the future, .then uch stru~;tures would be needed at that time . ~~ Registered Professionai Engineer' Number 50316 Martin i.. Riley, Jr. Registered Public Surveyor Number 4089 6 ~ _ ~ PAGE '2 • Park Area (3.72 acres tract).......Q = .AREA 3. _ _ 25 7.33 cfs Ad~acent.Street ..................Q = J 25 2.2;2 c fs Total.............Q = 25 9.55 cfs ch Site 9.00 acres tract).....~.Q` = AREA _4 . Char ( 2 5 65.3.1 cfs Ad''acent Street ................Q = J 25 5.79 cf Tota ..............t~ = 25 71.10 cfs . tial Site 0.45 acres tract). = ARES 5. Redden ~ 25 3.55 cfs d'acent Street...............Q - A J 25 0.98. cfs Total.,..,........Q - 25 4.53 cfs . `increased runoff quantities in the the. Substitut~.on of appropriate . laces in the re~rious discussion leads to the following conclusions: P p 1, AT FUTURE BRAZOSWOOD STREET , f SW side of street)...............34.67 i A. Total Runof { cfs B. Runoff flowing down proposed right-of-way......2b.00 cfs en Dr. towards down Glenha ows c. Carryover ~f1 Future G~l.~nbrook Circle) . / ............ . 8.6 7 c f s ', ~~ 2. STA 18+00 ON PROPOSED EXTENSION OF GLENHAUEN DRIVE OPPOSITE FUTURE ~~~LENBROO~RCLE ; Northeast Side of Street ;, ,, ` ea 2 , 3.72 acres ~) ... , . A. Runoff from Ar ~ .24.43 cf s B, Install a single Inlet with Z fsxtens~.ons: to remove 17.25 cfs_...... 17 , 25 . cf s C ~arrover (n NE side of street).... L Y . 7.18 cfs Southwest Side of Street i ~ - A. Carr ..over froam Brazoswood Street.... . S.b7 cfs B. 1{2 of Street................•...... . 0.95 cfs C. Total ............................... 9.b2 . cfs D. Install a single inlet in the radius on the NW corner of Glenbrook Circle to remove 5 cfs... .....:.............. . S.OO cfs E. The care over to flow down a: ditch y aloe the Future Glenbrook Circle to g the creek ...... .................. . 4.b2 cfs ,, F`. Install a 241' RCP connecting the inlets to carry atotal of 22:25 cfs and flow into the temporary i ditch. G 't'he capacity of a 24'' RCP on a l% tirade is 24 cfs. ' H. The Total-Flow in the ditch w ll be i 2b.87 cfs. I e h ~ .u, h PAGE 3 3. AT STA 20+QO 0:N PROPOSED GLENHAVEN'DRIVE Northeast Side°of Street A. Carr over from Sta'18+00............ ~ 7.18 cfs B~. . R~~nflfffrom .Park Area ................. 9, 55 cfs C. ~o'tal._............................. 1b.73 cfs D. The street :can handle the total runof f at this point { 19.41 cfs . > 16.73 cfs) 4. AT STA 23+37 ON PROPOSED GLENHAVEN DRIVE 1 Northeast Side of Street A. Carr over from Sta 20+00 .............. 16.73 cfs B. 0.2~~ of Church Trac Runoff.......... 14.22 cfs 7 C. Total ................................. 30.95 cfs D. Install-a single recessed inlet with 3 extensions { oteal opening-20 feet) ~ to intercept 1.15 cfs/ ft.......1..... 23.00 cfs E. Carryover.......................1... 7.95 cfs F ~ A 24 ~~ RCP on a grade of l . S 7% ...leading o-~t of the inlet would be needed from Sta 23+3~ to Sta.24+87 to hand e the flow. Pipe capacity .is _30. cfs 5. AT STA 24+87 ~N PROPOSED GL.ENHAVEN DRIVE Northeast Side of Street A. + Carryover from Sta 23 37 ............. 7l. 5 9 cfs B. 0.4 %~of Church Tract Runoff......... 28.44 cfs ~ C. Total ................................. 3 c s ~ 'D. Ins`ta11 a single recessed inlet with 3 extensions (total opening-20 ft.) to~ intercep 1. l5 cfs / f t .. . ...........23.0.0 cf s E. Carryover ..............................13.39 cfs F. The tota flow leaving the inlet would be 46 cfs.: The :capacity of a 30" RCP on a 1.571 grade is 52 cfs. T~~~re:fore, a 30,~ RCP would be required between Sta 24+87 and Sta 26+37. b ~, AT STA 26+37 ON~.PROPOSED GLENHAVEN:.DR:IVE i _ Northeast Side of Street A. Carryover from.Sta 24+$7......x....... .13.39 cfs B. 0.2% of Church Tract Runoff......,... .14.22 cfs C. Total ..........:.............C...... .27.b1 cfs D. Install a snglerecessed inlet with - 3 extensions ~ total oper-.ing--20 f t . ) ' to intercept .15 cfs/ft............ .23.00 cfs ~L ~~' &~ PAGE 4 ._ E. Carr over...............:.......... Y 4.61 cfs F . The. total f low leaving `the role would be 69 cf s . The ,capacity. of a ~~ single 30`' RCP on a 1.57% grade is 52 cf s Therefore, 2-30„ RCP' s kTouldbe required between Sta 26+37 dr.~d Sta 27+87. 7. AT STA 27+87 O:~T PROPOSED GLENHAVEN DRIVE Northeast Side of Street A. Carr over .from Sta 26+37.. ~........... Y 4. bl cf s B. 0.2%:of Church Tract Runoff...........: 14.22 cfs C. runoff from Residential Area........... 4.53 cfs D. Total.... .......................... 23~.3b cfs E.. -Install a single recessed inlet with- 3 extensions (tota opening-fin ft.} to intercept l.3 cfs/ft.tn low . point) ....................,.......... 2b . 00 cf s F. The total flow leaving the inlet , would be 92.36 cfs. Therefore, 2-30„ RCP's would be required to handle the flow under the treet. The minimum 'grade would be (-) 1.5% to give a total f` c,~paci y of 100 cf s The 2 -30" RCP's would enter a singleinlet to~ be placed on the southwest side of the street to co lect an :runoff that might be-in that side of the street. The only runoff would be that coming from the street itself or from an overflow from the northeast side of the street.