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Test 3 for Civil and Environmental Engineering Fluid Mechanics | CEE 3500, Exams of Civil Engineering

Material Type: Exam; Class: Civil and Environmental Engineering Fluid Mechanics; Subject: Civil & Environmental Engr; University: Utah State University; Term: Fall 2005;

Typology: Exams

Pre 2010

Uploaded on 07/30/2009

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CEE 3500 – Fall 2005 – TEST 3 – Friday, November 11, 2005
Name:___________________________________________________
[1]. A spillway model is to be built to a scale of 1:25 across a flume that is 2 ft wide.
The prototype is 37.5 ft high, and the maximum head expected is 5.0 ft. If the flow over
the model at 0.20 ft head is 0.70 cfs, what is the flow per unit width (in ft2/s) in the
prototype?
Solution: q = __________________________________.
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Name:___________________________________________________

[1]. A spillway model is to be built to a scale of 1:25 across a flume that is 2 ft wide. The prototype is 37.5 ft high, and the maximum head expected is 5.0 ft. If the flow over the model at 0.20 ft head is 0.70 cfs , what is the flow per unit width (in ft 2 /s ) in the prototype?

Solution: q = __________________________________.

Name:___________________________________________________

[2]. The discharge per unit length q = Q/B over a rectangular weir depends on the approach depth H and on the acceleration of gravity g. (Here, Q is the discharge and B is the width of the weir). First, using dimensional analysis, form a Π (Pi) term involving the parameters q , H , and g. Then, using the definition of the unit discharge, namely, q = Q/B , and making the Π term equal to a constant C ,obtain an expression for the discharge Q.

Solution: Q = _____________________________

Name:___________________________________________________

[4]. For the pump-pipeline-reservoir system shown in the figure the following data are provided: Q = 2.0 cfs , L = 1250 ft , D = 0.50 ft , e = 0.0001 in , K (^) e = 0.8 , K (^) v = 1.8 , and K (^) d = 1.0. The graph below shows the pump curve with hP ( ft ) and Q ( cfs ). Using Swamee- Jain's equation to calculate the friction factor, determine the value of the difference of

elevation between the reservoirs' free surfaces, Δ z. The flowing fluid is water at 60 o^ F.

Solution: Δ z = ____________________________