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i <br /> Sediment Trap Design <br /> I <br /> Basin Flow Information: <br /> f 2-year developed peak discharge <br /> I Basin A: 0.27 cfs <br /> Basin B: 0.11 cfs <br /> •'Caiculations for flows can be found in the basin summary pages of Appendix C. <br /> Basin A(Powder Mill Gulch Basin) is found on Page 1 of the summary. <br /> IBasin B (Narbeck Creek Basin) is found on Page 3 of the summary. <br /> ISEDIMENT TRAP DESIGN: BASIN A <br /> Surface Area = 337.50 sf (Required Surface Area at top of Riser) <br /> � Min. 1.5' sediment storage depth below outlet elevation <br /> 3:1 Iength to width ratio <br /> The outlet shall be a perforated CMP riser with a washed gravel filter cone. <br /> I Assume 3:1 sideslope <br /> RECTANGULAR <br /> Pond Width 11.0 <br /> � Pond Length 33.0 <br /> � Ratio X:1 3.0 <br /> Surface Area Check 363 Ok <br /> � SEDIMENT TRAP DESIGN: BASIN 8 <br /> I Surface Area = 137.50 sf (Required Surface Area at top of Riser) <br /> Min. 1.5' sediment storage depth below outlet elevation <br /> 3:1 length to width ratio <br /> I The outlet shall be a perforated CMP riser with n washed gravel filter cone. <br /> � Assume 3:1 sidesiope <br /> RECTANGULAR <br /> Pond Width 7.0 <br /> Pond Length 21.0 <br /> I Ratio X:1 3.0 <br /> Surface Area Ctieck 147 Ok <br /> I <br /> I <br /> � <br /> � <br /> I Seaway Center Lot 3B <br /> P:\TOC Management Services\033179\Design\Calculationsltesc.xls 1/10/2007 <br />