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Hydraulic radius (HR or just R) <br /> is the ratio of the cross-sectional area divided by the wetted <br /> perimeter. For a hypothetical stream with a rectangular cross <br /> sectional shape (a stream with a flat bottom and vertical sides) the <br /> cross-sectional area is simply the width multiplied by the depth (`i1T <br /> * D). For the same hypothetical stream the wetted perimeter would <br /> be the depth plus the width plus the depth (W + 2D). The greater the <br /> cross-sectional area in comparison to the wetted perimeter, the <br /> more freely flowing will the stream be because less of the water in <br /> the stream is in proximity to the frictional bed. So as hydraulic <br /> radius increases so will velocity (all other factors being equal). As <br /> streams get deeper, for example during a flood, the hydraulic <br /> radius increases. There is a greater mass of water per frictional <br /> wetted perimeter. The stream flows more efficiently. <br /> 1000 <br /> Erasion <br /> 100 <br /> %%WSW <br /> 2:h10 <br /> �o <br /> Transpoftationr <br /> � Deposition <br /> 1 <br /> 0.01 0.7 1.0 10 100 <br /> Diameter (mm) <br />