Laserfiche WebLink
Notched Grade Board Trench <br /> For roof areas larger than 700 ft2,dispersion trenches with notched grade boards may be used with <br /> a total length not to exceed 50 ft. <br /> Notched Grade Board Trench Length (ft) = (10 ft)*(Roof Area to Trench (ft2)) <br /> 700 (ft2) <br /> ■ Notched grade board trench length required: ------ <br /> If greater than 50 feet needed more than one trench will be required <br /> ■ Number of notched grade board trenches required: <br /> ■ Length of each notched grade board trenches: <br /> ❑ See attached sketch. <br /> Splashblocks <br /> Splashblocks shall be designed in accordance with the SWMMWW. A maximum of 700 ft2 of roof <br /> area can drain to a single splashblock. <br /> ■ Roof area requiring mitigation: <br /> ■ Roof area discharging to splashblock:___-----_____ <br /> ❑ See attached sketch. <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):2219 <br /> ■ Roof area discharging to perforated stub-out connection: 2219________ <br /> ■ Perforated pipe length (ft): 4_438 <br /> Perforated Pipe Length (ft) = (10 ft)*(Roof Area to Facility_(ft?)1 <br /> 5000 (ft2) <br /> The minimum perforated pipe length shall be 10 ft. <br /> City of Everett Public Works <br /> Small Project Stormwater Site Plan Report-Dec 2019 40 <br />