HydroCAD Stormwater Modeling - Since 1986

PaverGuide paving system
supported by HydroCAD

HydroCAD provides direct support for the PaverGuide system of permeable paving. This allows the storage and infiltration capabilities of PaverGuide installations to be easily modeled with HydroCAD.

PaverGuide can be modeled with HydroCAD-10, which provides an interactive chamber wizard for easy layout, pricing, and modeling of modular storage systems.  Earlier versions will require a program update in order to model PaverGuide systems.  If you're already using HydroCAD-10, make sure you have "build 18" or later in order to get PaverGuide support.  Details here.

From the manufacturer:

"PaverGuide combines stormwater storage with subbase stabilization so water may be stored directly beneath trafficked surfaces. The low-profile PaverGuide system is an asset whenever high groundwater or shallow bedrock is an issue, or simply when an 8 inch stormwater system profile is desirable. PaverGuide offers an effective means for decentralized, shallow infiltration which minimizes cost and improves efficiency. PaverGuide is proof load tested and supports loads in excess of H-25 so it may be used beneath parking lots, courtyards, urban sidewalks, driveways, and any other surface where the management of rainwater is required."

How chambers are modeled

In a HydroCAD model, stormwater storage, such as the PaverGuide base, typically appears as part of the storage definition for a "pond".  In the simplest case, HydroCAD calculates the total storage for use with other calculations.  But more often, HydroCAD 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 can 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.

In the case of a PaverGuide system, HydroCAD calculates the internal storage of the PaverGuide modules, plus the stone base, if desired.  This determines the total storage available in the "pond", as well as the area available for exfiltration calculations.

The HydroCAD model can also include auxiliary storage provided by adjacent pipes and catch basins, plus above-grade areas (e.g. parking lot) that may provide overflow storage for certain events.

Modeling PaverGuide systems

Setting up a "pond" with PaverGuide storage is a simple process:  Just select the Chamber Wizard, pick desired PaverGuide item from the drop-down list, and set the number of rows and the row length.  A separate chamber definition is provided for system heights up to 16 modules high.

In addition to calculating the total storage in the PaverGuide system, HydroCAD can perform runoff and routing calculations to verify the behavior of the PaverGuide system under any desired rainfall conditions.

Detailed chamber information

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

For more information about HydroCAD

Please see the following pages for further HydroCAD information:

    Pond storage calculations
    Storage chamber modeling
    Exfiltration calculations
    General support page
    HydroCAD features and capabilities
    Free evaluation program
    Pricing and ordering

HydroCAD is a registered trademark of HydroCAD Software Solutions LLC.
PaverGuide is a trademark of PaverGuide Inc.


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