CEE 345, Spring 2012, Midterm Exam Solutions: Pipe Networks and Pumps
1. The frictional headloss is given by the DW equation as . Although it is true that f declines
with increasing V, the velocity head increases in proportion to V2. The dependence of f o
CEE 345, Part 2, Winter 2012, Final Exam Solutions (Open Channel Flow)
1. (a) (8) List and briefly describe the forces that must be considered in an analysis of flow in a
trapezoidal channel with a slope of 0.006. (One or two sentences should be enough fo
CEE 345, Part 2, Spring 2012, Final Exam Solutions
If you do not know a value that you believe you need to solve a problem, make a reasonable
assumption for that value, state the assumption clearly, and proceed. For any of the problems, if
you get to a po
CEE 345 Part 2, Win 2012 Exam #1
Note: In cases where explanations are requested, no more than two sentences are required!
1. (5) The flow in a 2.4-m-diameter pipeline with relative roughness of 0.0008 is fully
turbulent. Over what length of pipe does the
CEE 345 Part 2, Assignment #2 Solutions
Note: A few people have asked questions about the differences in terminology between the course textbook and my notes. In the text, ha is used generically to represent the amount of head added to a fluid by a pump;
CEE 345 Part 2, Assignment #4, Due 6/1, 11:30am
1. a) The measured velocities, computed as L/t, were 7.66, 7.66, and 7.80 m/s, yielding an
average value of 0.777 m/s. The measured depths were 13.09 and 11.60 cm, for an
average of 12.34 cm, so the average
CEE 345 Part 2, Assignment #3 Solutions
1. The velocity in the channel can be computed as:
V
Q
10 m3 /s
1.667 m/s
by 3 m 2 m
The Froude number is therefore:
Fr
V
V
c
gy
1.667 m/s
9.81 m/s2 2 m
0.376
Because the Froude number is <1, the flow is sub-c
CEE 345 Part 2, Sp 2012, Assignment #1 Solutions
Due 5/9, 11:30am
1. From the Moody diagram, the friction factor for fully turbulent flow in a pipe with
relative roughness of 0.0008 is f = 0.019. The water therefore loses an amount of energy
per unit weig
CEE 345 Part 2, Assignment #2 Solutions
1. Determination of the flow rates in the various pipes requires that we start with a guesses for those flow
rates that meet the continuity criterion. We then use the Hazen-Williams equation to compute the
headloss
CEE 345, Part 2; Win 2012, Exam #1 Solutions 1. From the Moody diagram, the friction factor for fully turbulent flow in pipe with relative roughness of 0.0008 is f = 0.019. The water therefore loses energy per unit weight equal to 1.9% of a velocity head