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SEDINtENT TRAP DESIGN <br />Project Name: <br />Pro ect Number: <br />DRAINAC3E CRITERIA: <br />RAINFALL METHOD: <br />Evergreen Walgreens BY P•A•�• <br />99043.02 Date: BItAl9 <br />City of Everett <br />Sa�Ya Barbara Unit Hydrograph (SBUH) <br />METHOD OF ANALYSIS: (Section �-5.6 CESWM) <br />Step 11 Reauired S��iment Trao Sur(ace Area <br />Tributary area = �•37 � <br />02 = 0.18 cts <br />�1100 = WA cfs <br />H= Storage depth = 2 h <br />Z = Sidesiope = 3 ft/ft <br />T= Dewatering time = 24 hr <br />G = Gravity = 32.2 fUs^2 <br />As = Req'd surface area = Q2 ' 1250 sf/cfs � 225 sf <br />Step 21 Provlded Sediment Trap SuAace Area <br />Prrnided trap dimensions� width ft len th ft <br />badom = 10 10 <br />water surface = 22 22 AREA= 484 sf, OK! <br />top = 28 28 <br />