HydroCAD Stormwater Modeling - Since 1986

HydroCAD Supports
Stormwater Storage Products from
Terre ArchTerre Hill Stormwater Systems

HydroCAD provides full support for the stormwater storage products offered by Terre Hill Stormwater Systems, including Terre Arch and Terre Box stormwater chambers.

This partnership allows Terre Hill products to be easily used within any HydroCAD model for stormwater storage, detention, or infiltration.  HydroCAD includes complete Terre Hill chamber definitions, plus an interactive chamber wizard for easy layout, pricing, and modeling of underground storage systems.

Support for Terre Hill products was added in HydroCAD 9.0 build 8.  If you have an earlier version of HydroCAD, you must obtain a program update in order to model Terre Hill chambers.

How storage is modeled

Terre Arch InstallationStormwater 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 ground.

Flexible storage options

Terre BoxEach 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.

Modeling Terre Hill Stormwater Systems storage products

Setting up a pond to use Terre Hill storage products is a simple process:  Just pick the desired model from the drop-down list, and specify the number of chambers plus their elevation.  HydroCAD supports the Terre Arch 26 and Terre Arch  48, as well as the associated end-caps and manifolds.

To allow for storage in the stone backfill, first describe the shape and dimensions of the outer excavation, and set the stone voids.  Then specify the chamber(s) and set them to embed within the stone.  For maximum accuracy, you can also embed the associated headers and end-caps.  Based on this information the composite storage is calculated automatically.

Note: The chamber wizard will automatically configure the chambers and stone bed, but the headers and end-caps must be entered separately.  For details see the chamber modeling instructions.

The Terre Box can be modeled in HydroCAD as a concrete box pipe of the same size.

Modeling exfiltration and outlet control structures

To perform a complete hydrograph routing through a Terre Hill system, select the appropriate outlet controls on the "Outlets" tab.  For details read about pond modeling.

Detailed product information

For detailed Terre Hill specifications and design information, please visit the Terre Hill web site.

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)
    Exfiltration calculations
    General support page
    HydroCAD features and capabilities
    Free evaluation program
    Pricing and ordering

Terre Arch and Terre Box are trademarks of Terre Hill Stormwater Systems
HydroCAD is a registered trademark of HydroCAD Software Solutions LLC
Product illustrations Terre Hill Stormwater Systems


[Home]   [Support] 
Copyright 2022 HydroCAD Software Solutions LLC (privacy)   (legal notices)