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TECHNICAL REFERENCE <br /> Channel Liners <br /> Flexible channel liners provide protection recommendations, the liner w(is <br /> i of the channel surface from the erosive subjected to a series of 30 minute flow <br /> forces of channelized flow during and events which continued until S 1nc hes of <br /> after vegetation establishment Without soil (complete seed bed) was lost from an <br /> adequate protection during the delicate average of 27 cross secUon<il points, or <br /> period before complete vegetation the lining material was torn of seriously <br /> establishment-when full channel degraded <br /> protection depends solely on the flexible <br /> liner-the channel surfcice is subject to Tables 6 and 7 illustrate the ranges of <br /> severe scouring Severe scouring not flow velocity and depth in which the <br /> only removes the soil, plant seeds and flexible liners performed effectively in the <br /> seedlings, but often leads to changes in test channel Since these limiting values <br /> channel configurations, effecting the will change with channel configuration <br /> designed hydraulic functions of the and slope, Table 8 lists the maximum <br /> channel tractive force or sheer stress ratings and <br /> roughness coefficients for all North <br /> The capabilities of several commercially American Green blankets These values <br /> available flexible channel liners to prevent are to be used when selecting North <br /> scour of unvegetated channel surfaces American Green blankets using the <br /> were tested by Colorado State University's Federal Highway Administration's <br /> Engineering Research Center for North Maximum Tractive Force Method for <br /> American Green'" Each liner was tested determining suitable channel liners <br /> on an 8' x 80' long trapezoidal, sandy These values and FHWA selection <br /> loam channel with a I' bottom and 2 1 procedures are utilized in the North <br /> side slopes on a 3% grade American Green Erosion Control Plan <br /> design software package (See page 15 <br /> After installation of each material for further information ) <br /> according to the manufacturer's <br /> ToNe 6 , <br /> Maximum Surface Velocity (FPS) <br /> ro <br /> x <br /> 7 <br /> c, <br /> 4 <br /> 3 <br /> 2 Fuxd Fused Fused <br /> r poi tlry r�4w PVC <br /> krx rTkit n1l r»t BareSai — <br /> 0 <br /> s <br /> i5 <br />