a) A pipeline is needed to drain water away from a hypermarket car park which regularly gets flooded during even moderate rainfall. The current drainage system starts to fail at a rate of 5m³/s and it is estimated that a drainage rate of at least 15m³/s is needed so that flooding would only occur once every ten years. The drain has fall of 2m over a length of 200m. Estimate the smallest pipe diameter which would clear the water where the head available at the start of the drain is 1.5m. Assume that the Darcey Weisbach friction coefficient would be 0.012 b) An alternative suggestion for the drainage is to replace the pipe with an open channel of width 2m which would have the same slope as the pipe and made of smooth concrete with a Manning friction value of 0.12 c) Compare the open channel with the pipe system for providing the required drainage

a) A pipeline is needed to drain water away from a hypermarket car park which regularly gets flooded during even moderate rainfall. The current drainage system starts to fail at a rate of 5m³/s and it is estimated that a drainage rate of at least 15m³/s is needed so that flooding would only occur once every ten years. The drain has fall of 2m over a length of 200m. Estimate the smallest pipe diameter which would clear the water where the head available at the start of the drain is 1.5m. Assume that the Darcey Weisbach friction coefficient would be 0.012 b) An alternative suggestion for the drainage is to replace the pipe with an open channel of width 2m which would have the same slope as the pipe and made of smooth concrete with a Manning friction value of 0.12 c) Compare the open channel with the pipe system for providing the required drainage

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Storm Sewers and Detention

The storm drains system transports rainwater or stormwater and other runoff from roads, parking lots, and roof downpipes directly to nearby creeks, rivers, or the sea without any treatment.

Question

Task 2 Calculate forces related to fluids at rest and in motion
a) A pipeline is needed to drain water away from a hypermarket car park which regularly gets
flooded during even moderate rainfall. The current drainage system starts to fail at a rate
of 5m³/s and it is estimated that a drainage rate of at least 15m³/s is needed so that
flooding would only occur once every ten years. The drain has fall of 2m over a length of
200m. Estimate the smallest pipe diameter which would clear the water where the head
available at the start of the drain is 1.5m. Assume that the Darcey Weisbach friction
coefficient would be 0.012
b) An alternative suggestion for the drainage is to replace the pipe with an open channel of
width 2m which would have the same slope as the pipe and made of smooth concrete with
a Manning friction value of 0.12
c) Compare the open channel with the pipe system for providing the required drainage

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