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Typically,
detention ponds are required to mitigate the impacts of increased rates of
runoff caused by most land development projects. In particular, the
peak rate of runoff for the post-development condition is not allowed to
exceed the pre-development peak rate of runoff for the same storm
event. Often, a specific design storm such as the 25-year 24-hour
event is used to size the detention pond. The size of the detention
pond is a function not only of the volume differences between the pre- and
post-development conditions, but also the timing of those differences.
Download
Detailed Example Detention Pond Design Using ICPR
ICPR
includes a Pond Sizer tool to assist in
sizing detention ponds and can be found in the "Basin Time Series
Reports" (Report #2). This report compares volume differences
between two runoff hydrographs and based on those differences, provides a
table of average pond areas for various design depths.
The following
sequence illustrates how to access and use the Pond Sizer tool.
1.
Go to the Basin Time Series Reports
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2.
Using "Report 02", select the pre- and post-development
drainage basins,
then click the "Generate Report"
button.
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3.
A table of design depths in half-foot increments with
corresponding average
pond surface
areas is provided. This
becomes the design
footprint for the
pond.
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