HydroCAD Stormwater Modeling - Since 1986

HydroCAD Supports
retain-it Stormwater Chambers

HydroCAD 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 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 ground.

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 chamber itself.

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.  Or you can use the HydroCAD chamber wizard to automatically layout the system and calculate the storage.  Depending on the application, the wizard can even calculate storage in the surrounding stone envelope!

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)
    Exfiltration calculations
    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.

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