Design Guide
Page 3
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05/15
2.0
Product Information
2.1
Applications
HydroStor chambers were designed to primarily function as a stomwater detention and retention
structure. In addition, they deliver additional benefits by providing both water quality and water
quantity management. HydroStor chambers are an ideal storage system that maintains above
ground uses such as parking lots, roadways, and green space.
HydroStor chambers provide the maximum flexibility for use on a construction site. Chamber
systems can be configured in large beds or in individual trenches and can be used on almost any
site to provide the required storage and improve water quality. The chamber systems can be
retrofitted to sites that have already been developed and can be designed to efficiently and easily
work around utilities, structures and other boundaries.
2.2
Stormwater Detention
Chamber systems have been used in stormwater detention for several years. A detention system is
primarily used to hold stormwater before it is released from the site, reducing the peak flow rates
of the site and restoring flow rates to that of pre-development conditions. The HydroStor
stormwater chamber system is an open bottom structure that allows infiltration of stormwater into
the ground. Most chamber systems are designed to provide a detention system type of control.
There are limiting circumstances such as soft subgrades, karst topography, and expansive clay
subgrades where infiltration may be undesirable. In situations such as these, a geomembrane liner
can provide an excellent alternative to limit infiltration.
2.3
Chamber Sizing
The primary determining factors when choosing a chamber size are the depth to groundwater,
bedrock, depth to other restrictive surface, available area for the underground system, cover height
required over the system, and outlet invert restrictions.
Because of differing site restrictions, HydroStor chambers are available in two sizes. The HS75 has
an installed capacity of 75 cubic feet per chamber, based on a stone porosity of 40%. In many cases
this is the optimal installation, especially for large footprints and limited vertical depth allowances
for the installation.
For sites with more vertical room and a smaller horizontal footprint the HS180 offers an excellent
choice with an installed capacity of 180 cubic feet per chamber, based on a 40% stone porosity.
This is the chamber of choice for tight sites with steep natural grades.
Illustrations of HydroStor HS180 and HS75 chambers and end caps are shown in Figures 1 and 2
below.
Summary of Contents for HydroStor HS180
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