Stormwater Storage Products from
Advanced Drainage Systems
HydroCAD provides full support for the stormwater storage products offered
by Advanced Drainage Systems, Inc.
including N-12® HDPE pipe and StormTech stormwater chambers.
partnership allows ADS products to be easily used within any HydroCAD model for
stormwater storage, detention, or infiltration. HydroCAD includes complete
ADS storage definitions, plus an interactive chamber
wizard for easy layout, pricing, and modeling of
underground storage systems.
Users of HydroCAD 9.1 and earlier should obtain a program update
to get the latest chamber definitions. The HydroCAD-10 update also
provides an enhanced
chamber wizard with automatic handling of end-caps and pipe headers.
How storage is modeled
storage typically appears in a HydroCAD model as part of the
storage definition for a "pond". In the simplest case, HydroCAD
calculates the total available storage, including the interior of the chambers,
plus the void space in any surrounding stone.
For a more complete analysis, a full stage-storage curve is calculated so that
an inflow or runoff hydrograph can be routed 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 HydroCAD 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 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.
ADS stormwater products
Setting up a pond to use ADS storage products 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 the ADS N-12 pipe
storage system as well as StormTech chambers.
For pipe or chambers in a stone bed, just describe the shape and dimensions of the
outer excavation, plus the stone voids, and the composite storage is
definitions for N-12 pipe are based on the published storage-per-foot values
listed here. These volumes are used to calculate an effective
inside diameter as used by HydroCAD. Although the effective ID will differ
slightly from the nominal ID, the internal storage calculated by HydroCAD
will be exactly the same as the published volume.
The displaced volume is not published, so it is calculated from the outside diameter, minus 30% of
the total wall volume which lies outside the corrugations and is available to
receive backfill. (Corrugation
percentage based on cross-sectional drawings of the pipe wall.)
For further technical information, read about modeling
corrugated plastic pipe.
Detailed product information
For detailed ADS specifications and design information, please visit the
For more information about HydroCAD
Please see the following pages for further HydroCAD information:
HydroCAD home page
Pond storage calculations
Storage chamber modeling
(includes step-by-step instructions)
General support page
HydroCAD features and capabilities
Free evaluation program
Pricing and ordering
N-12® is a registered trademark of
StormTech® is a registered trademark of StormTech Inc.
HydroCAD® is a registered trademark of HydroCAD
Software Solutions LLC
Product illustrations © ADS Inc.