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CATEGORY 3 - OTHER HARD SURFACES <br /> Category 3 — Other Hard Surfaces <br /> ■ BMP T5.30: Full Dispersion <br /> ■ BMP T5.15: Permeable Pavements <br /> ■ BMP T5.14: Rain Gardens <br /> ■ BMP T5.12: Sheet Flow Dispersion <br /> ■ BMP T5.11: Concentrated Flow Dispersion <br /> BMP T5.30: Full Dispersion <br /> Full dispersion shall be designed in accordance with the SWMMWW. <br /> ■ Residential(impervious surfaces) <br /> Total Impervious (ftp)*100% _ % (must be less than 10%to use BMP) <br /> Total Area (ft2) <br /> ■ Required Dispersion Area (ft') =Total Impervious Area (ft')* 6.5 <br /> Required Dispersion Area(ft2): <br /> ■ Dispersion area provided (ft'): <br /> (Note:Dispersion area must be preserved as forest or native vegetation.) <br /> BMP T5.15: Permeable Pavements <br /> Permeable pavement shall be designed in accordance with the SWMMWW. <br /> ❑ Include the following with the submittal: results of infiltration (Ksat)testing, groundwater elevation <br /> testing(or other documentation and justification for the rates and hydraulic restriction layer <br /> clearance), and justification for assumptions made in the runoff modeling. <br /> BMP T5.14: Rain Gardens <br /> Rain gardens shall be designed in accordance with the SWMMWW and include capacity for the total <br /> hard surface area (at least 5%) and any contributing area from lawn/landscaped areas (at least 2%). <br /> Top of Ponding Area (ft') = 0.05 * Total hard surface area (ft2) +0.02 * Lawn/landscape area (ft2) <br /> ■ Total hard surface area(ft2): <br /> ■ Lawn/landscape area (ft2): <br /> ■ Total contributing area(ft2): <br /> ■ Top of ponding area (ft2): <br /> City of Everett Public Works <br /> Small Project Stormwater Site Plan/Report—Sept.2023 Page 37 of 40 <br />