Hydraulic variables

Table 5.1 summarizes the simple and complex hydraulic variables in common use. Mean velocity and depth are the same variables described in Chapter 2, although here we use the symbols of hydraulic engineers rather than of hydrolo-gists. Surface roughness can be measured directly from particle dimensions, or by using a bed profiler such as a level plate through which a number of sliding vertical rods are pressed downward to the bed surface to generate a bed topography measure. Mean velocity, depth, and surface roughness are simple hydraulic variables that provide useful information about the flow environment. Using open-channel measurements and certain constants one can estimate hydraulic variables including channel Reynolds number (Re) and Froude's number (Fr).

TABLE 5.1 Some terms and equations useful in describing streamflow (Adapted from Davis and Barmuta 1989, Carling 1992).




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