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FLOOD05534
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Last modified
1/25/2010 6:49:30 PM
Creation date
10/5/2006 1:37:48 AM
Metadata
Fields
Template:
Floodplain Documents
County
Boulder
Community
Longmont
Stream Name
Longmont area basins
Basin
South Platte
Title
Urban Stormwater Management Master Plan
Date
12/5/1995
Prepared For
Longmont
Prepared By
WRC Engineering, Inc.
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br />[ <br /> <br />I <br />I <br /> <br />I <br /> <br />( <br /> <br />I <br /> <br />( <br /> <br />[ <br /> <br />1"_ 100' with 2-fOOl contour intervals and on computer di,kencs, WRC composill,d thcsc CAD file. <br />and incrcased the scale 10 ["-200' for tJu, finaldelivcrableproduclperlheprojcctconlfa<:l. <br />Existing slorm drain.gc systems wel'C determined primarily through diagram. provided by the City <br />on the previously described aerial-photograph b.", map', The.., map. were provided 311"-200' <br />seale and ioclwkd 'lOrn! sewers. channels. irrigation facilities, detention poll<h. Some floodplains, <br />and <llherpertinentinformalion. WRC lransfcrm:laIlrelevarnslormdrainagc informalion from the <br />photographs 10 the CAD mapping. The resulting drawings are presented in Panel formal .1 the back <br />oflhi,report. <br /> <br />lhe Manual w.. ~llowcd whete the Manual guidelines pnxluced e~c,,,,ive conMmim, for the <br />development of feasible stormwalcr management retro.fil all"",.l;ve. <br /> <br />As requesled by Ihe City. the minor storm 'y".m designs proposed in the Master Plan were ba.'Ci! <br />On the 2-year stoml. This design cyem waS deemed the most logical given thm moM of the existing <br />syslems are undersized for 2.year rullOff and upgrading (ret[(}-fining) I o S.year systems as required <br />by thc Manual for emain land mes would be infeasible due to prohibitive COSlS, FurthcrmOl"C, for <br />similar reasons. no lOO.year improvcmcnlS within the fully developed areas ofthc MSA arc proposed. <br />It was .ssumcdth.t, except for areas otherwise indicated in this M,stcr Plan. futlJrede\'elopmenlS <br />will beconstrueted fully in aecord.nce with the fC4uircmcnt, oftl1c M.nuaJ. <br /> <br />Otherm.ppinguscd for the projecl and providcd by the City included zoning rnaps; LongmontArea <br />Comprehensive Plan (LAC?) maps illCluding updates through February 13. 1992: and street maps, <br />Soil Conserv,tion Service maps were used for soils information, In addition. field surveys Were <br />performed to augment, where necessary. Ihe available information, The drainage structure inyenwry <br />program. de""ribed in Chapter Ill, provided additional information used in the hydraulic and <br />allerMtive systems analy,es, <br /> <br />In SOme ease" storm sewe, preliminary design has illCludcd surcharged storm ,ewers due to low <br />su,facegrade, and other site cnnslraints ,ueha, utility crossings. <br /> <br />The City provided WRC with numerous rcports eooceming drail!.\ge studies and orher studies related <br />to stonnwatcr m.,nagemen\. For those drainage designs tentatively appr<lYed by the City, information <br />COntailled ill the respective studies was used as a l>asis for developmcnt and de,ign of I>Iaster Plan <br />faciliries prcscmed in this report. <br /> <br />The City aho provided WRC with son;lary sewer maps and ,im.to.;nvert measurements fOl" 'eleCT <br />sanitary sewer manholesadjaccntlolhe'tormscweralignmelltsp"'posed in the prcliminary de signs <br />of tll;s !\-laster Plan, This information was used in conj~rI<;tion with the ..,hi mappi~ to de'~'mjne <br />the "pprn~imate elevation of sanilary sewcrs ~lo~ the propnsed alignmenlS. <br /> <br />D. <br /> <br />ANALYSIS AND DESIGN CRITERIA <br /> <br />The cri(eri. used for the hydrologic and hydraulic analysis and dcsi~n was generally that set forth ,n <br />,he Citv of Longmonl Storm Drainage Criteri, Manual (Manual: Reference. 1). Although the <br />standards 000 rcqu;rcmenlS of the Manl1il were p"nued asdoscly as po,"ible. "'lllcdeYi3tion from <br /> <br />) <br /> <br />, <br />
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