HydroCAD Stormwater Modeling - Since 1986

HydroCAD Supports CULTEC, Inc. Chambers

HydroCAD provides direct support for the full range of plastic stormwater and septic chambers manufactured by CULTEC, Inc, of Brookfield, Connecticut.  This partnership allows CULTEC chambers to be easily used within any HydroCAD model for stormwater storage, detention, or infiltration. 

HydroCAD includes complete CULTEC chamber definitions, plus an interactive chamber wizard for easy layout, pricing, and modeling of underground storage systems.

HydroCAD 10.2-5b is required to support the latest Cultec products, including the Recharger 300HD and the Recharger 902HD v2 with enlarged end-caps.

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 simply 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 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 layered 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.

Using CULTEC stormwater chambers

Setting up a pond to use CULTEC storage chambers is a simple process:  Just pick the desired model(s) from the drop-down list, and specify the number of chambers plus their elevation.  HydroCAD supports all CULTEC, Inc. chambers, including all RechargerTM, Contactor, HVLVTM, and Field DrainTM models.

For chambers in a stone bed, just describe the shape and dimensions of the outer excavation, plus the stone voids, and the composite storage is calculated automatically.

Why are the chamber dimensions different from the manufacturer's data?

Some chamber definition files use the effective dimensions of each chamber.  These values include the effects of the corrugated sides, and allow exact calculation of the storage volume at any depth.  The effective dimensions may be somewhat less than the overall (outside) dimensions quoted by the manufacturer.

When calculating the volume for multiple chambers in a row, HydroCAD uses the lay-up length, rather than the outside chamber length.  This avoids double-counting the volume at the overlap between each successive chamber.

Detailed chamber information

For detailed chamber specifications and design information, please visit the CULTEC, Inc. web site at www.cultec.com

CULTEC also offers the free StormGenie Drawing Program, which automatically generates drawings of CULTEC chamber systems in AutoCAD.

For more information about HydroCAD

Please see the following pages for further HydroCAD information:

Typical CULTEC Installation    HydroCAD home page
    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

Chamber images courtesy of CULTEC, Inc.
Recharger, Contactor, HVLV, Field Drain, and StormGenie are trademarks of CULTEC, Inc.
AutoCAD is a registered trademark of Autodesk, Inc.
HydroCAD is a registered trademark of HydroCAD Software Solutions LLC


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