charge down the channel is measured using a rectangular weir that has a crest 25 cm long. The crest of ir is set at a height of 25 cm above the bottom of the channel. The head over the weir crest, measured a table distance upstream is 25 cm. The coefficient of the discharge of the weir is 0.781. Ignoring side ntractions: Calculate the discharge ignoring the velocity of approach

Principles of Geotechnical Engineering (MindTap Course List)
9th Edition
ISBN:9781305970939
Author:Braja M. Das, Khaled Sobhan
Publisher:Braja M. Das, Khaled Sobhan
Chapter8: Seepage
Section: Chapter Questions
Problem 8.11P
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An experiment is conducted in a laboratory channel. Accuracy is important. The channel is 50 cm wide. The
discharge down the channel is measured using a rectangular weir that has a crest 25 cm long. The crest of the
weir is set at a height of 25 cm above the bottom of the channel. The head over the weir crest, measured at a
suitable distance upstream is 25 cm. The coefficient of the discharge of the weir is 0.781. Ignoring side
contractions:
(a) Calculate the discharge ignoring the velocity of approach
(b) Calculate the discharge taking into account the velocity of approach
(c) Calculate the percentage error in the discharge that results from ignoring the velocity of approach.
a)
Estimate of discharge ignoring the velocity of approach (l/s)
Round your answer to 1 decimal place.
Transcribed Image Text:An experiment is conducted in a laboratory channel. Accuracy is important. The channel is 50 cm wide. The discharge down the channel is measured using a rectangular weir that has a crest 25 cm long. The crest of the weir is set at a height of 25 cm above the bottom of the channel. The head over the weir crest, measured at a suitable distance upstream is 25 cm. The coefficient of the discharge of the weir is 0.781. Ignoring side contractions: (a) Calculate the discharge ignoring the velocity of approach (b) Calculate the discharge taking into account the velocity of approach (c) Calculate the percentage error in the discharge that results from ignoring the velocity of approach. a) Estimate of discharge ignoring the velocity of approach (l/s) Round your answer to 1 decimal place.
b)
Estimate of discharge taking account of velocity of approach (1 iteration) (l/s)
Transcribed Image Text:b) Estimate of discharge taking account of velocity of approach (1 iteration) (l/s)
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