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HomeMy WebLinkAbout19-PLNAPP-569_Hydrology MemoFebruary 2, 2022 | Page 1 Memorandum February 2, 2022 To: City of Bozeman 121 N Rouse Ave, Bozeman, MT 59715 (406) 582-2300 Project TRH Bozeman, MT Project # 20210037 From Brok Burchatz Re Stormwater Strategy Copies 01 This memorandum shall clarify the stormwater strategy for the proposed Texas Roadhouse at 870 Harmon Stream Boulevard, Bozeman, MT as part of the City of Bozeman Concept Review Application. This drainage strategy references the previous drainage study dated July 7, 2006 by Morrison-Maierle, Inc. for the Bozeman Gateway Development project. The proposed Texas Roadhouse lies across Minor Basins 8 and 9, which drain to Stormtech Systems 8 and 9 respectively for detention and treatment. The proposed restaurant has already been accounted for in the original study’s Zone B2 Community Business Land Use and runoff coefficient and will therefore drain to the Stormtech systems as originally delineated in the Minor Drainage Basins Map: · The west half of the building will direct roof drain runoff through storm drains that outlet through the curb face into the west parking lot. This runoff will then surface flow into Stormtech System 8 for detention and treatment. · The east half of the building will direct roof drain runoff through storm drains that outlet into the Stormtech System 9 manhole in the parking lot to the east. This runoff will then be treated and detained by System 9. Attachments: · Conceptual Grading Plan for Texas Roadhouse · Original Minor Drainage Basins Map by Morrison-Maierle End of Memorandum Proj 20210037 date 06/21/22 TEXASROADHOUSEHUFFINE LANE(US HIGHWAY 191)GRADING ANDDRAINAGE PLANC4.030 Executive ParkSuite 100Irvine, CA 92614t: 949 296 0450PROJECT TEAMCOPYRIGHT NOTICEISSUE/REVISION RECORDPROFESSIONAL SEALPROFESSIONAL IN CHARGEPROJECT MANAGERQUALITY CONTROLDRAWN BYPROJECT NAMESHEET NUMBERwww.greenbergfarrow.comPROJECT NUMBERSHEET TITLETEXASROADHOUSEBOZEMANMONTANA870 HARMON STREAM BLVDBOZEMAN, MT 59715®“” “"” Proj 20210037date 06/21/22 -^^..__....IEXIST. 30" ARCPIE=4835.52-36" RCP--OR-EQUIVAtERT-VEST KAW RRinnE SPAN:'SKfMTES'95' RCP0HWLSTORMTECHSYSTEM 3EM1024" Rt;riS8BjMIN§g5iA% jOi AREA-7= 3.68 ac.Q10 = 5.66cfs^Q25_^ 6.78cfslet^Pon ^J©1:u?me^^~%SYSTEMSTORMTECHSYSTEM 1a"~E324" RCP2-24" RCP08 E@UIVALEK1;II ISRID&E-SPANnnsassy.M-ni..BASIN-.. 36SS ac.13,55cfs16iNa;feimeI^Snfto.s.Iq15" RClate=3-C-f^^5-:445iatEaa'-fie..EQBIWL.EIpBRi@6fr;iSP%lMlRr°iARsiQ10MINOR BASIN 8AREA-,= 7.02 ac,|Qi-e—i vascfs-V3 ,:,:., Q25 =Detention Volume^"'/-;..;• S13'// {J^:/IU<(427cft:li ^iaBAgfN S=3AREA h ?.26 ae.Q 10 4 8j't9cfs3S25c: 9iSic<fe=3 co d-rBet^1;onr%iuSr<= N3^crt-3C=3i'3462cftca«°~KCj^MINOR BASINGn.AREj»L=j5^2^.••^5cfsQ25 = 5.^5cfs |\ 15" RCfDetentioriNolupi^\= 3915cfta r-"WSSmssSSSe^SSSSSYSTEM 11 IIn/^IaBLSi/}.scf'-tC=3o.s.s7^uu.'^^L>s^ce-,4-DRCPJA [——I—I r Su-A I—!-iJ\Jd^y*•-..,.\j^D--S5y^o8" RCP^..2-24" RCPOR EQUIVALEBRIDGE SPANsb-.-.""•18" RCP's^^'^/L.Jf-^gQRMT^H ^'^^6"<^ 7|<iNpK-<^l^ 5/4 /k^i .35 :hy?.7ss»'' yy^<.-:—'fc.<IN&R..-$AStN--7^^ AREA ='4^0,Q10 = 6.7j0c'f<Q25 = 8.04cfs/Detention ^(pluye/•2-30" RCPEQUIVALENTilDGE SPAN1nQSTORMTECHSYSTEMo.s.-?=^33-2-59x36 ARCPOR EQUIVALENTBRIDGE SPAN2uI—.£v—"^.»^s-s;::.SB--*S"^CP-15" RC15" R787,•—Tu-q-M24" RCF^-.B=rs=15" RCiQ10^=-:2.75GW ^•'/•'[025 = 3.28cfg,,///'1 Detention Vq^-^ 1422cftA\o.s.\ \^ftyi0\J5" RCPi MtNOR-BAS)NJ 2_jfnlvm^=TB" RCP""S^iyac,'I '•AREA-./r i^Q40—9-4-4.cfg)etention Volytne"= 6g7e'c-ftliffiH^^-StlSTEM 4-^15" RCP—'^)FS; PA?IN 6ftKEA esT3.59 ac.-Q}0 = i6.43c:fa,^6 = 7,68c5-3ion Volume^>"rf2-24' RdOR EOUIVABRIDGE SP.."(VI lfl._:i=; r\Lvi ^J^&B/?iS4!wMlaA1a000c=-SfA!2-30" RCF3R EQUIVALENTBRIDGE SPANc ~= 2.60 ac:|10 = 4.63cf slil Q25 = 5.54cf3 .detention Volumes 2851 sftC^=)C"=3000Q_-Jl.,,,.J—o.s.M2^:52ift-0 C3 C4064cft120155cftlumeiio.s.S I0C3C=3.\/-sn.-....>''•--t/'—pNOTES: .1. THIS PRELIMINARY PLAN IS INTENDED TO ILLUSTRATE THE ESTIMATED DRAINAGEREQUIREMENTS FOR THE BOZEMAN GATEWAY SITE. ACTUAL REQUIREMENTS WILL BEDETERMINED AS PART OF THE SITE PLAN REVIEW PROCESS FOR EACH INDIVIDUALSITE.•2. INDIVIDUAL DETENTION AND TREATMENT FACILITIES WILL BE PROVIDED ON-SITE ASPART OF THE SITE IMPROVMENTS FOR EACH INDIVIDUAL SITE.3. PIPE SIZES SHOWN ARE PRELIMINARY. FINAL PIPE SIZES WILL BE DETERMINEDDURING THE PLAN AND SPECIFICATION REVIEW PROCESS.GRAPHIC SCALE100 0 50( IN FEET )1 inch = 100 ft.iMORRISONJMAIERLEjNc.)An fm.flstVfi-Own* '! 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