WWRC 88-18
Multi-Objective Detention Basin Design in Urban Drainage Systems -- Tradeoff Between Risk and Cost
Introduction
An appropriate design for the detention basin storage facility plays an important role
in the control of pollution caused by combined urban stormwater and sewer overflow.
Due to the random characteristics of runoff magnitude, duration, and inter-arrival
time, a detention basin of a given size is always subject to the potential possibility of
overflow. In an urban drainage system involving treatment and detention facilities,
the risk of a possible occurrence of overflow is inversely related to the treatment
capacity and size of the detention basin. Therefore, the design of the treatment
capacity and size of the detention basin is multi-objective in nature. The intention of
this note is to establish a framework exploring the trade-off between the risk of
overflow and the cost of treatment and storage facilities, so that a more realistic design
decision can be made.
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