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0 Worksheet 3 BMP Sizing Worksheets <br /> DISPERSON BMPS <br /> BMP T5.11 Concentrated Flow Dispersion <br /> Concentrated flow dispersion BMPs shall be designed in accordance with the SWMMWW. Clearly show the <br /> vegetated flowpath on the site plan. A maximum of 700 ft2 of roof area can drain to each dispersion BMP. <br /> ■ Hard surface area requiring mitigation:----- ___ <br /> ■ Hard surface draining to dispersion BMP: <br /> ■ #of dispersion BMPs: Total Hard Surface <br /> 700 ft2 <br /> ■ Dispersion trench required? ❑ Yes ❑ No <br /> (must be included if flow path is 25 to 50 ft) <br /> BMP T5.12 Sheet Flow Dispersion <br /> Sheet flow dispersion BMPs shall be designed in accordance with the SWMMWW. <br /> ■ Hard surface area requiring mitigation:_____________ <br /> ■ Width of paved surface discharging into sheet flow dispersion BMP: <br /> ■ Minimum required width of vegetated buffer: <br /> (10 ft for every 20 ft of paved/hard surface,or fraction there of) <br /> BMP T5.30 Full Dispersion <br /> Full dispersion BMPs shall be designed in accordance with the SWMMWW. <br /> ■ Residential (impervious surfaces). All calculations are for areas with a single Threshold Discharge <br /> Area (TDA). If multiple TDAs exist, provide a calculation for each. <br /> Total Impervious (ft2)*1000/. _ % (must be less than 10%to use BMP) <br /> Total Area (ft2) <br /> ■ Required Dispersion Area (ft2) = Total Impervious Area(ft2)*6.5 <br /> Required Dispersion Area (ft2)*6.5 =___.............ft2 <br /> ■ Dispersion area provided: ----- ___ <br /> (Note:Dispersion area must be preserved as forest or native vegetation.) <br /> City of Everett Public Works <br /> Small Project Stormwater Site Plan Report-Dec 2019 37 <br />