WATER RESOURCES ENGINEERING
3rd Edition
ISBN: 9781119490579
Author: Mays
Publisher: WILEY
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Question
Chapter 4, Problem 4.2.2P
To determine
Velocity at which water is ejected.
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Consider flow from a water reservoir through a circular hole of diameter D = 0.16m at the sidewall at a vertical distance H from the free surface. The flow rate through an actual hole with a sharp-edged entrance (?? = 0.47) is considerably less than the flow rate calculated assuming “frictionless” flow and thus zero loss for the hole. Disregarding the effect of the kinetic energy correction factor, obtain a relation for the “equivalent diameter” of the sharp-edged hole
Ex. # 2
A new cast iron pipe 300 mm in diameter and 1600 long carries water from a
reservoir and discharges into the air. If the entrance to the pipe is 3 m below the water
level in the reservoir and the pipe is laid on a downgrade at 2 m per km, determine the
discharge.
3m
1000
A horizontal pipe of 150 mm diameter for the initial 30 m and 75 mm
b)
diameter for the remaining 10 m is connected to a water tank. The
height of water in tank is 15 m above the centre line of the pipe. Find
out the flow rate through the pipe, taking all losses into the account.
Consider the reduction in diameter of the pipe as sudden coefficient of
friction for the pipe is 0.008.
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