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� Y <br /> { 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:_2.101l-. 11_ <br /> • Hard surface draining to dispersion BMP: <br /> ■ #of dispersion BMPs: Total Hard Surface= <br /> 700 ft2 <br /> ■ Dispersion trench required? ❑ Yes FM 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: 2°1 <br /> ` <br /> 1'- <br /> ■ Width of paved surface discharging into sheet flow dispersion BMP: <br /> • Minimum required width of vegetated buffer:_^///4- <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)*100%= °%o (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 Storm water Site Plan Report-Dec 2019 37 <br />