1710 W MARINE VIEW DR 2024-01-03

BMP C208: Triangular Silt Dike (TSD) Purpose Triangular silt dikes (TSDs) may be used as check dams, for perimeter protection, for temporary soil stockpile protection, for drop inlet protection, or as a temporary interceptor dike. Conditions of Use . TSDs may be used on soil or pavement with adhesive or staples. . TSDs have been used to build temporary: • BMP C241: Sediment Pond (Temporary); • BMP C200: Interceptor Dike and Swale; • BMP C 154: Concrete Washout Area; • BMP C203: Water Bars; • BMP C206: Level Spreader; • BMP C220: Inlet Protection; • BMP C207: Check Dams • curbing; and • berms. Design and Installation Specifications . TSDs are made of urethane foam sewn into a woven geosynthetic fabric. . TSDs are triangular,10 inches to 14 inches high in the center, with a 20-inch to 28-inch base. A 2 foot apron extends beyond both sides of the triangle along its standard section of 7 feet. A sleeve at one end allows attachment of additional sections as needed. . Install with ends curved up to prevent water from flowing around the ends. . The fabric flaps and check dam units are attached to the ground with wire staples. Wire staples should be No.11 gauge wire and should be 200 mm to 300 mm in length. . When multiple units are installed, the sleeve of fabric at the end of the unit shall overlap the abutting unit and be stapled. . When used as check dams: • TSDs should be located and installed as soon as construction will allow. • TSDs should be placed perpendicular to the flow of water. • The leading edge of the TSD must be secured with rocks, sandbags, or a small key slot 2019 Stormwater Management Manual for Western Washington Volume 11 - Chapter 3 - Page 354