Laserfiche WebLink
The following table provides minimum rain garden footprints based upon total contributing area. <br /> r"M.Total Contributing qP Minimum op MOW Minimum Bottom of Minimum Top . <br /> lope Area(ft') Ponding Area(ft') Ponding Area(ft') Berm Area(ft') <br /> 2:1 <_800 40 0.11 50 <br /> 2:1 <_ 1,400 70 0.13 110 <br /> 3:1 <_3,000 150 0.06 235 <br /> BMP TS.12: Sheet Flow Dispersion <br /> Sheet flow dispersion BMPs shall be designed in accordance with the SWMMWW. <br /> ■ Hard surface area requiring mitigation (ft2): <br /> ■ Width of paved surface discharging into sheet flow dispersion BMP (ft): <br /> ■ Minimum required width of vegetated buffer(ft): <br /> (10 feet for every 20 feet of paved/hard surface, or fraction thereof) <br /> ❑ Include the following on the Stormwater Site Plan: sheet flow dispersion BMP length and width; <br /> hard surface area (including ft2 draining to each dispersion BMP); vegetated buffer width. <br /> BMP TS.11: Concentrated Flow Dispersion <br /> Concentrated flow dispersion BMPs shall be designed in accordance with the SWMMWW.A <br /> maximum of 700 ft'of roof area can drain to each dispersion BMP. <br /> ■ Hard surface area requiring mitigation (ft2): <br /> ■ Hard surface area draining to dispersion BMP (ft2): <br /> ■ #of dispersion BMPs:Total Hard Surface Area = <br /> 700 ft2 <br /> ■ Dispersion trench required? ❑ Yes ❑ No <br /> (must be included if flow path is 25 to 50 feet) <br /> ❑ Include the following on the Stormwater Site Plan: dispersion BMP length and width; hard surface <br /> area (including ft2 draining to each dispersion BMP);vegetated flow path. <br /> City of Everett Public Works <br /> Small Project Stormwater Site Plan/Report—Sept.2023 Page 38 of 40 <br />