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<br />, <br /> <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 />Table 1 <br /> <br />Table 1 <br /> <br />SUMMARY SHEET <br />BLACKMER GULCH TRIBUTARY HYDROLOGY <br /> <br />COrmNUED <br /> <br />STORi'l HYDROGRAPH CHARACTERISTICS - FUTURE CONDITIOnS <br /> <br />100-Year Precipitation - 3.19 inches - 120 minute duration <br /> <br />Hydrologic <br />Point <br />1 <br /> <br /> <br />lOO-Year Storm <br />Peak - CFS Volume Acre-feet) <br />3 4 <br /> <br />RAINFALL DATA <br /> <br />Pervious Area <br /> <br />- Infiltration rate = 0.08 inch/lO.minutes <br />Detention and depression storage = 0.30 inch <br />Effective precipitation = 1.94 inch <br /> <br />#1 El Camino St. <br /> <br />2,40 <br />2.33 <br /> <br />418.5 <br /> <br />24.1 <br /> <br />#2 Blac~TIer Lake <br /> <br />539.3 <br /> <br />59.2 <br /> <br />Impervious Area <br /> <br />- Depression and detention storage = 0.05 inch <br />Loss = 0.15 incr. <br />Effective precipitation = 2.99 inches <br /> <br />LEGEND OF ABBREVIATIONS <br /> <br />BASIN CHARACTERISTICS <br /> Hydrologic Area Length = L Length = Lca <br /> Point Acres Miles Mil es <br /> 1 2 3 4 <br />#1 El Camino St. 121.9 0.44 0.15 82 56 <br />#2 Blackmer Lake 305.0 1.42 0.87 32 64 <br />UNIT HYDROGRAPH CHARACTERISTICS <br /> Hydrologic <br /> Point <br /> 1 <br />#1 El Cami no St. 0.41 0.53 0.22 18.1 0.32 0.17 1548.8 295.0 10.1 <br />#2 Blackmer Lake 0.53 0.60 0.56 38.9 0.74 0.38 679,6 323.9 25.4 <br /> <br /> <br />L = Length along stream from study point to upstream limits of the basin <br />in miles. <br />Lca Distance from study point along stream to the centroid of the basin <br />in miles, <br />Ct = A coefficient reflecting time to peak. <br />Cn = A coefficient related to peak rate of runoff. <br />tp = Time to peuk of h'ydro<Jr~ph frolTlmidpoint of unit rainfall in hourc" <br />Tp - Time frolTl hl'ginnin'l of unit rilinfilll to pt'ilk Of f1ydro'Irdph ill IlIintJ/,p'i. <br />W50 = Width of unit hydrourrlph .It 50 pt.rcent or pI'llk di'.cI1r1r'l(', <br />W75 l.idUI of unit hydrourapll ill. 7~) peru:nt of I','ak discll<lr'l'" <br />qp Peak rate of runoff in CFS per square lIIi 1 [>, <br />Op 0 f1aximUIII unit hydrograph peak in CFS. <br /> <br /> <br />IWTE: Hydrological studied based on the Co10rarlo Urban Hydrogranh Procedure- <br />as presented in the tLrball_~toJ:lll.o_r.a.itlaJle_ _CriJi'!j_a_t~an_u.a.1. <br /> <br />- 3- <br />