United States Department of Transportation
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Edition:Final report
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Abstract:A series of tests to determine the performance of ten flexible ditch lining materials were conducted at the U.S. Geological Survey Gulf Coast Hydroscience Center's Hydraulic Laboratory. The objectives of the tests were to determine the effect of the flexible liners on the germination and growth of grass and to determine the effectiveness of the liners to prevent erosion on highway channels until the establishment of vegetation. The vegetation establishment portion of the test was conducted on two types of soils, an erosion resistant soil and an erodible soil, while the erosion control portion of the test was conducted on an erodible soil only. The vegetation establishment test was conducted by planting grass on the test plots, installing the ten flexible liners and then checking for grass growth over a seven week period. Results include the seven week period as well as six months later. The erosion control portion of the test was conducted by installing the liner being tested in a 70 foot long trapizoidal channel. Each liner was tested to failure at a minimum of two slopes in order to determine the maximum permissible depth of flow in the test channel at varying slopes. Results of these tests include the following parameters: the depth of flow, water flow rate, water surface slope, hydraulic radius, mean velocity of flow, Manning's roughness coefficient, Froude number, bed shear stress, and bed shear velocity. The maximum permissible depth of flow in a trapezoidal channel based on bed shear stress lined with each of the ten flexible ditch lining materials is shown graphically.
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