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• ,cif ,%. � r: � .1 ,.. s �r�� �`?C-. ' r1.- �.'.` r— C' iu <br />MEMORANDUM b v+ <br />TO: Kirk Brooks <br />FROM: Jane Zimmerman <br />DATE: March 18, 1992 (� •Zi1 <br />SUBJECT: Plan Review, SEPA #2-92 <br />VOW <br />Cprgg TIONS <br />Vegetated Swales <br />Current City standards call for vegetated storm swales dischao be with <br />designed for the 2 year, <br />higher flows diverted around the Swale.If <br />slstemssibble, the le <br />swales should be designed wpipeaisysketched in on sheet C-1. <br />arrangement for the bypass pipe <br />The Swale should then be designed per the following criteria <br />for the 2 year, 24-hour storm: <br />„n„ = 0.12 per second <br />max velocity = 1.5 feet p <br />max. depth = 0.5 feet <br />If diversion is not feasible, the following additional <br />design criteria will apply for the 25 year, 24-hour storm: <br />„n„ = 0.035 <br />max velocity = 4.0 feet per second <br />max. depth = 1.0 feet <br />PLAN REVIEW COMMENTS <br />Vegetated swales: <br />Spot elevations in the bottom of the Swale should be given <br />at the head of the Swale, at the Swale outlet, and at <br />approximately 50 foot intervals along the length of the <br />Swale. <br />The -plans should specify construction of the swale per <br />section 4.15.1.2 of the City of Everett Is Design and <br />ns. he Swale <br />Construction standards andVSp7 oficatiothe ity'sTstandardsseed <br />and plant list from page <br />should also be included on the plans. <br />