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12/9/02 4:11:24 pm Perteet Engineering. Inc page 2 <br />Silver Lake Elementary <br />Preliminary Drainage Design <br />.............. ...... <br />BASIN SUMMARY <br />BASIN ID: Aare-002 <br />NAME: predeV 2yr-BSN A New PKG Lot <br />SBUH .<ETHOD6LOGY <br />TOTAL AREA.......: <br />1.65 Acres SASEFLOWS: <br />0.00 Cf9 <br />RAINFALL TYPE....: <br />TYPElA PERV <br />IMP <br />PRECIPITATION....: <br />1.70 inches AREA-: 1.65 <br />Acres <br />0.00 Acres <br />TIME INTERVAL....: <br />30.00 min CN....: 76.OD <br />0.00 <br />TC....: 44.01 <br />min <br />0.00 min <br />ABSTRACTION COBFP: <br />0.20 <br />TCReach - Sheet L: <br />275.00 ns:0.4000 p2yr: 1.70 <br />s:0.0570 <br />TCReach - Channel L: <br />110.00 ke:17..00 9:0.0500 <br />PEAK RATE: . 0.03 cfs <br />VOL:- 0.04 Ac-ft TIME: <br />960 min <br />BASIN I0: Apre-030 <br />NAME: predev 10yr-BSN A <br />New PKG Lot <br />SBUH METHODOLOGY <br />TOTAL AREA..... <br />1.65 Acres BASEFLOWS: <br />0.00 cfs <br />hA!NFALL TYPE....: <br />TYPEIA PERV <br />IMP <br />PRECIPITATION....: <br />2.30 inches AREA..: 1.65 <br />Acres <br />0.00 Acres <br />TIME I1TERVAL....: <br />10.00 min CH....; 76.00 <br />0.00 <br />TC....: 44.01 <br />min <br />0.00 min <br />AnSTRACTION COEFF: <br />0.20 <br />TCReach - Sheet L: <br />275.00 ns:0.4000 p2yr: 1.70 <br />s:0.0570 <br />TCReach - Channel L: <br />110.00 kc:17.00 9:0.0500 <br />PEAK RATE: O.OB cfs VOL: O:08 Ac-ft TIME: <br />540 min <br />, <br />BASIN ID: Apra-100 <br />NAME: predev 100yr-BSN A New PKG Imr <br />SBUH 14ETIIODOLOGY <br />TOTAL AREA.......: <br />1.65 Acres BASEFLOWS: <br />0.00 cfs <br />RAINFALL TYPE....: <br />TYPElA PERV <br />IMP <br />PRECIPITATION....: <br />3.20 inches AREA-: 1.65 <br />Acres <br />0.00 Acres <br />TIME•I1ITERVAL....: <br />10.00 min CN....: 76.00 <br />0.00 <br />• - TC 44 <br />01 min <br />0.00 min <br />ABSTRACTION COEFP: 0.20 <br />TCReach - Sheet L: 275.00 ns:0.4000 p2yr: 1.70 9:0.0570 <br />TcReaeh - Channel L: 110.00 kc:17.00 s:0.0500 <br />PEAK RATE: 0.20 cfs VOL: 0,16 Ac-ft TIME: 490 min <br />