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Figure II-3.11: Temporary Channel Liners <br />Overlap 6" <br />(150mm) minimum <br />Excavate channel <br />to design grade J_ <br />and cross section <br />Design Depth <br />Overcut channel 2' (50mm) to allow \N^bulking during seedbed preparation <br />Typical installation with <br />„.,,. <br />erosion control blankets <br />9\ or turf reinforcement mats <br />6' <br />Intermittent Check Slot Longitudinal Anchor Trench <br />Shingle -lap spliced ends or begin <br />new roll in an intermittent check slot <br />Prepare soil and apply seed before l y <br />installing blankets, mats, or other `W "- <br />temporary channel liner system <br />14 <br />Longitudinal <br />anchor trench <br />Notes: <br />1. Design velocities exceeding 2 ft/sec (0.5��� <br />m/sec) require temporary blankets, mats, <br />or similar liners to protect seed and soil <br />until vegetation becomes established. <br />2. Grass -lined channels with design velocities <br />exceeding 6 ft/sec (2 m/sec) should include <br />turf reinforcement mats. NOT TO SCALE <br />Temporary Channel Liners <br />Revised July 2016 <br />DEPARTMENT OF <br />ECOLOGYPlease see http.1Avww.ecy. wa.gov/copyright.html for copyright notice including permissions, <br />State of Washington limitation of liability, and disclaimer. <br />2019 Stormwater Management Manual for Western Washington <br />Volume 11 - Chapter 3 - Page 336 <br />