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Unformatted text preview: theory of Prob. 10.115,
with n 0.018 to estimate the flow rate.
P10.117 A fullwidth 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 sharpcrested weir and (b) a roundnosed broadcrested weir.
*P10.118 Using a Bernoullitype analysis similar to Fig. 10.16a,
show that the theoretical discharge of the Vshaped 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
neardrowning 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 Vnotch 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.
 Spring '08
 Sakar

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