WATER RESOURCES ENGINEERING
3rd Edition
ISBN: 9781119490579
Author: Mays
Publisher: WILEY
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Question
Chapter 4, Problem 4.5.5P
To determine
The rate of flow and the elevation of the third reservoir.
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A pipeline (diameter 0.3 m, length 3 km) carries water
from point P to point R (see figure). The piezometric
heads at P and R are to be maintained at 100 m and
80 m, respectively. To increase the discharge, a second
pipe is added in parallel to the existing pipe from Q to
R. The length of the additional pipe is also 2 km.
Assume the friction factor f = 0.04 for all pipes and
ignore minor losses.
K
.P
1km
Q
2 km
R
2km
What is the increase in discharge, if the additional
pipe has same diameter (0.3 m)?
1. A 1 meter diameter pipe 1400 m long has a discharge of 600 liters/
sec
a. Compute the head loss using f = 0.018
b. Compute the head loss using n = 0.015
c. Compute the head loss using C = 100
%3D
%3D
%3D
Situation 4: A pipeline x joins pipelines
1
1, 2 and 3 at junction A. The pipelines
1,2 and 3 merges at junction B to form a
single pipeline y. The pressure heads at
A and B are 78 m and 42 m, respectively.
X A
2
В
y
Use Hazen-Williams constant c
120 for
all pipes.
Pipe
Length
3,000 m
1,300 m
2,600 m
Diameter
300 mm
a. Compute the rate of flow in pipeline 1.
1
200 mm
b. Compute the rate of flow in pipeline 2.
250 mm
c. Compute the total rate of flow.
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- Problem 1: A pipeline 300 m long discharge freely at a point 50 m lower than the water surface at intake (Figure 1). The pipe intake projects into the reservoir. The first 200 m is of 350 mm diameter and the remaining 100 m is of 250 mm diameter. (a) Find the rate of discharge assuming f= 0.06. If the junction point C of the two sizes of pipe is 40 m below the intake water surface level, find the pressure head. L₁, D₁, f AZ1 C L2, D2, f T 122 -V₁arrow_forwardA straight 30 cm pipeline 4.80 km long is laid between two reservoirs having surfaces at Elev 100 m and Elev. 50 m., entering the reservoirs 10 m beneath the free surfaces. To increase the capacity of the line, a 30 cm line 2.40 km long is laid from the midpoint of the original line to the reservoir. What increase in flow is gained by the installation of the new line? Use f=0.020 for all pipes. a. 31 L/s b. 27 L/s c. 25 L/s d. 29 L/sarrow_forwardWater flows at a rate of 0.8 cumecs in a 900 m-long pipe with a total head loss of 4m.Solve for the pipe diameter in mm by, a.Manning's formula with n = 0.014; and (b) Hazen-Williams formula with C1 = 130.arrow_forward
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