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<br /> ~ <br /> I 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 I <br /> I I <br />: II <br />I I ! <br /> II <br /> <br />It. i.s GeneI'al prGcLi,ce Le. dc;:.ii~tJ slC'nn rll'ain.:.J~::'.' la_'jUt les for 5 to 10 <br /> <br />year nd:ll'ul.l,inl,'_IlsLLy i'l\..:of"l'lcIlCir...::.>" SOIlI(: f'aci"Liti'..':..J U!'(: dt:~.i!:.llL'd ror' ndIl- <br /> <br />fall inLensj ty rn~que!lcies u,;:; low as two 'y\;i;JI'S <br /> <br />Ir~l(3' "<.I ~tlE: of' 1))'2 properLy <br /> <br />being protected and the P()3~,i.ble d.ani~'2r 1~O 1.ifE' from i'loorJillf:j are factors that <br /> <br />should be considered in dCt.f:.-illl1.IlillG the rainfall JIlCt3JiGlt..y fr'2quency that <br /> <br />sllould be use:]. <br /> <br />rrhe foll.owing frequencies for the design of stonn ul'9.inage facilities for <br /> <br />Fort .Collins are suggested as a [!,"'Ileral guide: <br /> <br />Closed Sewers <br /> <br />High Vslue Business Areas. -, - - <br />Hesident.lal ~Ilj [ndQS1..rial Al't::us~ <br />Open DUell ella/Ule 15 - - - - - - <br />Open Spriug C'n:(:}~ CtHHllI'21 . - - <br />:-"';Pl'lC1i.j Creek Lkldr..:,t:;j Ulld Closeu Cl1ol1!le~L <br /> <br />C - RUNOFF COEFFICIElI'l' <br /> <br />10 years <br />j :....ectl.s <br />10 yei.il'S <br />50 '.'eal'S <br />50 year's <br /> <br />The runoff' coefficient. "(''' in l"hr; IlraticlJ:<J..l 1'01u]1J1<./1 is dcpcndent OIl the <br /> <br />slope, perviousness and terrai.n of the ar~a anJ Lhc~ pel'cenlage of' the area <br /> <br />that is occupied by sUJ'f'aces of' the va.ri.o'...is degTcc:::~ of' iUJ!Jel'viousness. The <br /> <br />suggested runoff coei'ficient s to use fo]' the vari.ou.s 1 ypes nf surfaces are <br /> <br />tabulated below, <br /> <br />!lype o~~~~J'a~ <br /> <br />RunDff' Coei'fi Cl.clrL <br /> <br />PavernclILs aud SiLlc"vwlks <br />Hoo fs - - - - <br />Gravel DI'l ves - <br />LU"lflS. <br /> <br />.So <br />.(~j <br />. C(l <br /> <br />Slope <br />Sl:)jJe <br />Slave <br /> <br />2l':~ and les3 ~ _ <br />- ';:',% t.0 T~' <br />0"'2" 7%" - - - <br /> <br />.1) <br />.20 <br />.30 <br /> <br />0_3 <br />