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<br />Page 17 <br /> <br />TABLE V <br />DESIGN CRITERIA, MAJOR GRASS LINED CHANNELS <br /> <br />Maj or Runoff <br />Discharge <br /> <br />Veloci ty <br /> <br />Not more than <br />7.0 fps <br />5.0 fps in sandy <br />channels <br /> <br />Depth <br /> <br />Not more than <br />5.0 ft. <br /> <br />Side Slopes <br /> <br />Not steeper than <br />3: 1 <br />4: 1 preferred <br /> <br />Curvature <br /> <br />Radius twice top <br />width but not <br />less than 100 ft. <br /> <br />Freeboard <br /> <br />Not less than 1 <br />foot <br /> <br />Froude No. <br /> <br />Not greater than <br />0.8 <br /> <br />*Roughness <br />Factor <br /> <br />between 0.025 <br />and 0.035 <br /> <br />Initial Runoff <br />Discharge <br /> <br />Not less than <br />2.0 fps <br /> <br />N/A <br /> <br />Not steeper than <br />3:1 <br />4: 1 preferred <br /> <br />N/A <br /> <br />N/A <br /> <br />Not greater than <br />0.8 <br /> <br />between 0.035 <br />and 0.100 <br /> <br />*Higher values should be used for computing depth of <br />flow; use lower valves for computing velocity and Froude No. (NF = V/,/gD') <br />where "D" is the hydraulic depth = (area/top width) <br /> <br />TABLE VI. DESIGN CRITERIA, MINOR GRASS LINED CHANNELS <br /> <br />Initial and Major Runoff Discharge <br /> <br />Velocity <br />Depth <br />Side Slopes <br />Freeboard <br />Top Width (major <br />storm) <br />Froude No. <br /> <br />less than 7.0 fps <br />less than 2.0 ft. <br />not steeper than 2:1 <br />at least 0.5 ft. <br />less than 10.0 ft. <br /> <br />less than 0.7 <br />