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Outlet from HydroStor Chamber Systems
Most installations of chamber systems are used for detention and will therefore require some type of outlet
structure. In detention design, the outlet structure is usually designed to match the pre-developed flow
rates for each storm as closely as possible.
Since the chamber system utilizes the stone surrounding it for additional storage, a perimeter underdrain
system may be necessary to completely drain the system. The underdrain must be located in or under the
foundation stone, preferably in a sump area to completely drain the system. If a sump is used, it is usually
unnecessary to slope the base to provide drainage. The underdrain should not be installed under the
chambers. Figures 14 depicts an optional perimeter underdrain outlet configuration with minimum
recommended dimensions.
One of the benefits of an open bottom chamber system is its ability to infiltrate stormwater back into the
ground, providing a situation closer to the pre-developed conditions. A combined outlet approach can help
minimize the storage volume needed by providing the ability to infiltrate a portion of the stormwater
runoff, while releasing excess flow during large storm events through the drainage system. This can be
accomplished by providing an outlet structure or pipe with a higher invert elevation within the HydroStor
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Figure 14 – Optional Perimeter Underdrain Outlet
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Design Guide
05/15
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