HydroCAD® Stormwater Modeling - Since 1986
HydroCAD Supports CUDO Stormwater Chambers
HydroCAD provides direct support for CUDO® stormwater chambers manufactured by Cudo Stormwater Products, Inc. of Occidental, California. This allows CUDO to be easily used within any HydroCAD model for stormwater storage, detention, or infiltration.
The CUDO can be modeled with HydroCAD-9.1 build 22 or later. If you have an earlier 9.1 build, you can get the latest build at no charge by using your previous HydroCAD 9.1 download details. If you have an earlier version of HydroCAD, you must obtain a program update in order to model CUDO products.
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 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, such as above-ground areas (parking lots) that may provide overflow storage for certain events.
But the most significant feature is the ability to 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.
Modeling the CUDO storage chamber
Setting up a pond to use CUDO chambers is a simple process: Just pick the desired CUDO unit from the drop-down list, and specify the total number of chambers. Since the CUDO is typically used in a stacked configuration, separate definitions are provided for heights of one to four units.
For chambers in a stone bed, you can describe the shape and dimensions of the outer excavation, plus the stone voids (porosity), and the composite storage is calculated automatically. Or you can use the new chamber wizard for automatic chamber layout, modeling, and cost estimating.
Detailed CUDO information
For detailed chamber specifications and design information, please see the CUDO web site.
For more information about HydroCAD
Please see the following pages for further HydroCAD information:
Pond storage calculations
Images courtesy of Cudo Stormwater Products,
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