HydroCAD® Stormwater Modeling - Since 1986
HydroCAD Supports Brentwood StormTank®
HydroCAD provides direct support for the StormTank®, manufactured by Brentwood Industries of Reading, Pennsylvania. This allows the StormTank to be easily used within any HydroCAD model for stormwater storage, detention, or infiltration.
StormTank Module 25 Series support was originally provided in HydroCAD-9.1 build 22, but HydroCAD-10 build 12 or later is required to support all height configurations, including double-layer systems. StormTank Module 20 Series was added in HydroCAD-10.1 If you have an earlier version of HydroCAD, you must obtain a program update in order to model all current StormTank products.
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.
But the most significant feature is the ability to embed (bury) chambers in a bed of crushed stone, and have HydroCAD automatically calculate the combined storage at any water surface elevation. This makes it easy to determine the storage for virtually any configuration of storage chambers, without resorting to any manual calculations.
HydroCAD can also model almost any imaginable storage arrangement, including chambers of different sizes combined with auxiliary storage from adjacent pipes and catch basins, and even the above-ground areas (parking lot) that may provide overflow storage for certain events.
Modeling the Brentwood StormTank
Setting up a pond to use StormTank chambers is a simple process: Just pick the desired StormTank 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 Brentwood Support Page
For more information about HydroCAD
Please see the following pages for further HydroCAD information:
Pond storage calculations
Images courtesy of Brentwood Industries.
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