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P10.121 Water flow in a rectangular channel is to be metered by
a thinplate weir with side contractions, as in Table 10.1b,
with L 6 ft and Y 1 ft. It is desired to measure flow
rates between 1500 and 3000 gal/min with only a 6in
change in upstream water depth. What is the most appropriate length for the weir width b?  eText Main Menu  Q
where f Qmod f 1.035 0.817 H*
2
H*
1 4 0.0647 for 0.70 H*/H* 0.93, where H* denotes H1
2
1
V 2/(2g) kh for brevity. The weir is then doublegaged
1
to measure both H1 and H2. Suppose that the weir crest
is 1 m high and 2 m wide. If the measured upstream and
downstream water depths are 2.0 and 1.9 m, respectively,
estimate the flow rate in gal/min. Comment on the possible uncertainty of your estimate. Textbook Table of Contents  Study Guide 706 Chapter 10 OpenChannel Flow P10.124 Water flows at 600 ft3/s in a rectangular channel 22 ft wide
with n 0.024 and a slope of 0.1°. A dam increases the
EES
depth to 15 ft, as in Fig. P10.124...
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 Spring '08
 Sakar

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