Water-power; an outline of the development and application of the energy of flowing water . Fig. is called the wetted perimeter. The mean depthmultiplied by the width ab is the area of the area, divided by the wetted perimeter, is called the hydraulic mean depth or the mean radius, and is repre-sented by R. It is obvious that in a natural river-channel thewetted perimeter is not materially different from the width,and that no great error can result from taking the one equal tothe other. In an artificial canal with vertical side 2, the wetted perimeter may
Water-power; an outline of the development and application of the energy of flowing water . Fig. is called the wetted perimeter. The mean depthmultiplied by the width ab is the area of the area, divided by the wetted perimeter, is called the hydraulic mean depth or the mean radius, and is repre-sented by R. It is obvious that in a natural river-channel thewetted perimeter is not materially different from the width,and that no great error can result from taking the one equal tothe other. In an artificial canal with vertical side 2, the wetted perimeter may differ very materially from. Fig. 2. the width. The relation between the slope, depth, andvelocity, in a stream, is ordinarily expressed by the formula V = c VRS. (0 Though this is the best formula that modern hydraulic sciencehas to offer for the case in hand, it is still very factor c varies between such wide limits that no generalvalue can be assigned to it. It is not only different for differentstreams and for different localities on the same stream, but itvaries for the same locality at different stages of the stream. 8 NATURAL WATERCOURSES. which shows that it does not truly express the law of thephenomenon. Nevertheless, in default of a better expression,we have to make such use as we can of it. The only rationaluse that the writer is able to make of it is by the aid of a tableof data contained in the work of Ganguillet and Kutter, trans-lated by Trautwine and Hering. This contains results ofmeasurements by different experimenters on a great numberof streams and channels from which it is usua
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