A 100 m by 25 m detention pond is proposed for a 7.5 ha site. The detention pond is 2 m deepunder control, or pre-storm, conditions and the water-quality depth is 2 cm. Storage in thedetention pond is to be discharged off-site via a triangular weir whose vertex is a the controlelevation, and the flow rate over the weir in m³/s is Q = 0.08H². H is the height of the watersurface above the vertex of the weir in m. The average annual rainfall at the site is 120 cm, andthe average runoff coefficient is 0.75. Determine the evacuation time and the average detentiontime in the pond.

Given:- 100m X 25m detention pond area=7.5ha depth =2m water quality depth =2cm Q=0.08H95/2) To…

nder control, or pre-storm, conditions and the water-quality etention pond is to be discharged off-site via a triangular we evation, and the flow rate over the weir in m³/s is Q = 0.08 urface above the vertex of the weir in m. The average annua

nder control, or pre-storm, conditions and the water-quality etention pond is to be discharged off-site via a triangular we evation, and the flow rate over the weir in m³/s is Q = 0.08 urface above the vertex of the weir in m. The average annua

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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Concept explainers

Highway Drainage

Highway drainage is the process of extracting and regulating the excess surface water on the pavement by giving the desired slope. The construction of a highway drain helps to divert the water present on the surface, and sub-grade by the means of slope. Highway drainage systems are a necessary part of smooth functioning of traffic, since the highway drainage systems provide proper disposal of unwanted substances from the highways.

Question

A 100 m by 25 m detention pond is proposed for a 7.5 ha site. The detention pond is 2 m deep
under control, or pre-storm, conditions and the water-quality depth is 2 cm. Storage in the
detention pond is to be discharged off-site via a triangular weir whose vertex is a the control
elevation, and the flow rate over the weir in m³/s is Q = 0.08H². H is the height of the water
surface above the vertex of the weir in m. The average annual rainfall at the site is 120 cm, and
the average runoff coefficient is 0.75. Determine the evacuation time and the average detention
time in the pond.

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