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Figure 11-4.2.1 Typical Grass -Lined Channels <br />Typical V-Shaped Channel Cross -Section <br />With Rock <br />Center <br />6" - g„ <br />(150-225mm) <br />Key in Fabric <br />Grass -Lined' <br />Filter Fabric <br />Typical Parabolic Channel Cross -Section <br />With Rock Center <br />for Base Flow <br />6„-91, <br />(150-225mm ) <br />With Channel Key in Fabric Filter Fabric <br />Liner <br />Typical Trapezoidal Channel Cross -Section <br />Overcut channel 2" (50mm) to allow <br />bulking during seedbed preparation <br />and growth of vegetation. <br />DEPARTMENT OF <br />ECOLOGY <br />State of Washington <br />Design Depth <br />l ' <br />With Rock Center <br />Filter Fabric for Base Flow <br />NOT TO SCALE <br />Figure II-4.2.1 <br />Typical Grass -Lined Channels <br />Revised June 2015 <br />Please see http.-#www.ecy.wa.gov/copyright.html for copyright notice including permissions, <br />limitation of liability. and disclaimer. <br />2014 Stormwater Management Manual for Westem Washington <br />Volume 11 - Chapter 4 - Page 336 <br />