Laserfiche WebLink
<br />For sand-bed streams, base n values range from ;as high as <br />0.04 at low flow to as small as 0,010 at high flow (see table), <br /> <br />Lower Flow Regime <br />Plane bed 0.014 - 0.020 <br />Ripples 0,018 - 0.030 <br />Dunes 0,020 - 0.040 <br />Transition <br />Washed out dunes 0,014 - 0,025 <br />Upper Flow Regime <br />Plane bed 0.010 - 0,013 <br />Standing waves 0,012 - 0.015 <br />Antidunes 0,012 - 0,020 <br /> <br />Manning's roughness coefficients for alluvial sand-bed channels. <br />(No vegetation, data limited to sand channels <br />with 050 < 1.0 mm.) <br /> <br />c. Coarse-bed channels <br /> <br />3.16 <br />