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Notched Grade Board Trench <br /> For roof areas larger than 700 ft2, dispersion trenches with notched grade boards may be used <br /> as long as their total length does not exceed 50 feet. <br /> Notched Grade Board Trench Length(ft) _ (10 ft) * Roof Area to Trench(ft2) <br /> 700 ft2 <br /> ■ Notched grade board trench length required (ft): <br /> If greater than 50 feet is needed, more than one trench will be required. <br /> ■ Number of notched grade board trenches required: <br /> ■ Length of each notched grade board trench (ft): <br /> ❑ Include the following on the Stormwater Site Plan: notched grade board trench locations <br /> and dimensions; roof area (including ft2 draining to each notched grade board trench) <br /> Splashblocks <br /> A maximum of 700 ft2 of roof area can drain to a single splashblock. <br /> ■ Roof area requiring mitigation (ft'): <br /> ■ Roof area discharging to splashblock(ft'): <br /> ❑ Include the following on the Stormwater Site Plan: splashblock locations; roof area <br /> (including ft2 discharging to each splashblock) <br /> BMP T5.10C: Perforated Stub-out Connections <br /> Perforated stub-out connections shall be designed in accordance with the SWMMWW. <br /> ■ Roof area requiring mitigation(ft2): <br /> ■ Roof area discharging to perforated stub-out connection (ft2): <br /> Perforated Pipe Length(ft) _ (10 ft) * Roof Area to Facility(ft2) <br /> 5,000 ft2 <br /> ■ Calculated perforated pipe length(ft): <br /> ■ Adjusted perforated pipe length (minimum of 10 feet) (ft): <br /> ❑ Include the following on the Stormwater Site Plan: perforated stub-out locations and dimensions; <br /> roof area (including ft2 discharging to each perforated stub-out connection) <br /> City of Everett Public Works <br /> Small Project Stormwater Site Plan/Report—Sept.2023 Page 36 of 40 <br />