HydroCAD Stormwater Modeling - Since 1986


HydroCAD Supports
StormCapture Stormwater Modules

HydroCAD provides direct support for the StormCapture system of precast concrete stormwater modules manufactured by Oldcastle Infrastructure.  This allows StormCapture modules to be easily used within any HydroCAD model for stormwater storage, detention, or infiltration.

StormCapture can be modeled with HydroCAD-10 build 11 or later.  Modeling the SC-1 with top slab requires HydroCAD 10.20-3g or later.  If you have an earlier version of HydroCAD, you must obtain a program update in order to model StormCapture modules.

How stormwater chambers are modeled

In a HydroCAD model, stormwater modules (referred to as "chambers" in HydroCAD) 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 StormCapture modules

Modeling StormCapture systems is easy with the HydroCAD chamber wizard:  Just pick the desired module style (SC1 or SC2) and height from the drop-down list and set the total number of modules.

Note: StormCapture modules will be found in the alphabetical chamber catalog under Oldcastle StormCapture

HydroCAD automatically allows for the solid outer wall in the perimeter modules and reduces the overall storage accordingly.  For modules on a stone bed, set the stone height, and the void storage is automatically added to the module volume.  For the open-bottomed SC1 modules, the chamber wizard automatically sets a default stone bed of 12", which can be adjusted as required.  For the solid-bottomed SC2 modules the stone bed defaults to zero.

If you wish to perform a complete hydrograph analysis you should also define your outlet devices, such as an overflow pipe or weir.  For retention systems you can define an exfiltration outlet and you're ready to route your inflow hydrograph!

Detailed product information

StormCapture installations are custom designed based on individual customer requirements, and may exhibit small storage variations depending on the system design and components used.  For most installations the HydroCAD volume calculations are within 0.1% of the factory specifications.

Before finalizing the design of your stormwater management system, StormCapture volume calculations should  be confirmed by a StormCapture representative.  For detailed chamber specifications and design information, please visit the StormCapture 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 Oldcastle Infrastructure
StormCapture is a registered trademark of Oldcastle Infrastructure
HydroCAD is a registered trademark of HydroCAD Software Solutions LLC.

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