But they are not small for a short sharp contraction

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Unformatted text preview: theory of Prob. 10.115, with n 0.018 to estimate the flow rate. P10.117 A full-width weir in a horizontal channel is 5 m wide and 80 cm high. The upstream depth is 1.5 m. Estimate the flow rate for (a) a sharp-crested weir and (b) a roundnosed broad-crested weir. *P10.118 Using a Bernoulli-type analysis similar to Fig. 10.16a, show that the theoretical discharge of the V-shaped weir in Fig. P10.118 is given by Q 0.7542g1/2 tan H5/2 Flow Y P10.120 P10.122 In 1952 E. S Crump developed the triangular weir shape shown in Fig. P10.122 [19, chap. 4]. The front slope is 1 2 to avoid sediment deposition, and the rear slope is 1 5 to maintain a stable tailwater flow. The beauty of the design is that it has a unique discharge correlation up to near-drowning conditions, H2/H1 0.75: Q H *P10.118 P10.119 Data by A. T. Lenz for water at 20°C (reported in Ref. 19) show a significant increase of discharge coefficient of V-notch weirs (Fig. P10.118) at low heads. For 20°, some measured values are as follows: H, ft 0.2 0.6 0.8 1.0 0.499 Cd 0.4...
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This note was uploaded on 10/27/2009 for the course MAE 101a taught by Professor Sakar during the Spring '08 term at UCSD.

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