retain-it® Stormwater Chambers
HydroCAD-10 provides direct support for
the retain-it system of precast concrete stormwater chambers.
This allows retain-it chambers to be easily used within any HydroCAD model for
stormwater storage, detention, or infiltration.
retain-it can be modeled with HydroCAD-10 build 8 or later,
with the 1ft and 1.5ft modules added in build 17. If you have an
earlier 10.0 build, you can get the latest build at no charge by using your
previous HydroCAD 10 download details. If you have an earlier version
of HydroCAD, you must obtain a
program update in order to model retain-it chambers.
How chambers are modeled
In a HydroCAD model, stormwater chambers typically appear as part of the
storage definition for a "pond". In the simplest case, HydroCAD
calculates the available storage for use with other calculations.
But more often, it is used to generate a complete inflow or runoff hydrograph and
route it through the pond. The resulting analysis indicates the water
levels attained throughout the rainfall event, as well as any discharge
that may occur through outlet devices or infiltration into the surrounding
Flexible storage options
Each pond may include an unlimited number of storage definitions as required
to describe its overall storage characteristics. This makes it
easy to model complex storage arrangements, such as a combination of multiple
chambers, pipe storage, catch basins, or other contributing volumes, including
above-ground areas (parking lots) that may provide overflow storage for large
events. HydroCAD can also calculate the storage contribution from sand or
gravel that surrounds the chambers. Or the storage can be limited to the
Modeling retain-it chambers
Setting up a pond to use
retain-it chambers is a simple process: Just pick the desired
retain-it height from the drop-down list, and specify the
total number of chambers.
For chambers in a stone bed, you can describe the shape and dimensions of the
outer excavation, plus the stone voids (porosity), and the composite storage is
calculated automatically. Or you can use the new
chamber wizard for automatic chamber layout,
modeling, and cost estimating.
Detailed chamber information
For detailed chamber specifications and design information, please visit the
retain-it web site.
For more information about HydroCAD
Please see the following pages for further HydroCAD information:
Pond storage calculations
Storage chamber modeling
(includes step-by-step instructions)
General support page
HydroCAD features and capabilities
Free evaluation program
Pricing and ordering
Images courtesy of Retain-it LLC.
retain-it® is a registered trademark of Retain-it LLC.
retain-it is covered by US Patent registration number 8,360,100
HydroCAD® is a registered trademark of HydroCAD
Software Solutions LLC.