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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />lilPlI Ii 2 - MINnDllJlSIQIl" "....., A <br /> <br />2.1 GenenIl. Po.Uq <br /> <br />Except ltJere spoMfi('(l "l-Alelc in these spec:ifi.caticm, tre JK'OC8Iures, aiteria lmd <br />st.alIlards set fcnth in tre ''Urban Storm Drainage Criteria Mmual, Vo1.uIEs 1 and 2" (tEIXM) <br />(Wright H:I.augh1:In FzW.-rs, 1%9) will be uHli"'l<J tD deter:mire tre adequacy of my storm <br />drainage plan suIIld.tted for approval. It is, tOOrefore, )'R", ...,~.:Ied that tre tEIX}I be used as 8 <br />guide in tl...;gJrl'lg the storm drainage systan ~ the ~firm-iaJS presented IEre:In do mt <br />provide BI-ifir guidatre. <br /> <br />2.2 Amlysis <br /> <br />2.2.1 A..u:jllcohle "*"""'" <br /> <br />Amlysis and det.erminatim of tre llIIDUI1t of flow at various points in the draiJIage systan <br />SWl be nade by approved systeuBt1c and ~ve oetIxxIs. '!h! following oetIxxIs SWl be <br />used tD verify the adequacy of designs sulmi.tted for approval: <br /> <br />8. p"HnnRl MrtIDl and Chlarado Urban IIydrogmjil Procedure <br /> <br />b. Storm wter IIIlIII3geJe1t DIXIe1. presented in the ''Flood Plain Infarnatic.n, Dra:l.mge <br />Plan and Street lmprovlm!nt Plan at Orchay, Colorado (Sinms, Li. & Asooriates, <br />ID::., 1982). <br /> <br />c. Or otIEr oetIxxIs as approved by the Town Coonc:il or its designated Lepr: :;!lltative <br /> <br />2.2.2 CkLteria for Storm Flow Amlysis <br /> <br />'!h! following criteria shall be uHli..J><l in the analysis of the drainage systan. <br /> <br />8. Runoff analysis SWl be based upa1 p.opoaed 1aOO use, and SWl take into <br />cmsi.deratic.n all cmtrlbuting runoff fron areas outside of the stlldy area. <br /> <br />'!h! analysis of storm nmoff fron existing developed areas lying outside of the <br />study area SWl be based upon present 1aOO use and topograrbic features. Drainage <br />reports for offsite developed areas, shall be reviewed, if available, for proper <br />coardinatic.n of drainage facilities. <br /> <br />All undeveloped 1aOO lying outside of the study area shall be amsidered as fully <br />developed based upon the IIIlSt probable anti.ciJSted future land use. Provided, <br />bJwever, that ~ the future land use of a specific lIIIdeve10ped area C8IIlJOt be <br />used in said area SWl not be less than 0.65 for the Rational ~tOOd runoff <br />rrv>ffi ri"'lt or an approved equivalent value for arry other Dl!thod. <br /> <br />b. '!h! probable future flow pattern in lIIIdevel.oped area shall be <br />based m existing natural tuJAlgIaphi.c features (existing slopes, drainageways, <br />etc.). <br /> <br />c. Average land slopes in both developed and undeveloped area my be used in CXJIIjlUting <br />runoff. /b;ever, for areas in ItID.ch drainage JStterDs and slopes are establislEd, <br />these shall be ,rti 1 i 7Ai. <br /> <br />2 <br />