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r�shb�rn'I o��nhomrs <br />7. WATER QUALITY DESIGN CRITERiA (CONT.� <br />TESC SEDIMI�;NT TRAP UTSIGN <br />Scditnent "I�raps are sized per thc livcrctt Stonmvalcr \-t�nual for small sitcs cf Icss than thrcc <br />acres. <br />•'l�rap Surface Arca, ns = 1.2 Q2/ Vscd <br />• Qc = 2-ycar design inflow l'or cicarcd sitc = 0.043 Cf S <br />• Vscd =��elocil}� of mcdiuro sill particic = 0.00096 fps <br />•\4inimum sloragc dcplh shall bc 1.5 fccL <br />• Outict shall bc a CMP riscr �viUi ���ashcd gravcl f ihcr conc. <br />• Length to �vidth ratio is> 3:1. <br />As = 1.2 QZ/ Vsed = <br />Minimum llepth = <br />L = 3W <br />L*�1'= 3�V^2= <br />W = 4.2' <br />L = 12.70' <br />U = 1.5' minimunt <br />1.2 • 0.043/0.00096 fps <br />1.S' <br />53.75 <br />= 53.75 sf <br />\VI:I 0�l-��1 I -13 � � <br />