HydroCAD Stormwater Modeling - Since 1986

HydroCAD Supports
Haviland Smooth Flow HDPE Pipe

HydroCAD provides full support for Haviland Smooth Flow HDPE pipe.  This partnership allows Haviland products to be easily used within any HydroCAD model for stormwater conveyance, storage, detention, or infiltration.  HydroCAD includes complete Haviland storage definitions, plus an interactive chamber wizard for easy layout, pricing, and modeling of underground storage systems.

If you're already using HydroCAD-10, make sure you have "build 13" or later in order to get Haviland support.  Details hereUsers of HydroCAD 9.1 and earlier should obtain a program update in order to get the latest chamber definitions.

How storage is modeled

Stormwater 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 (pipes), 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

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, 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.

Click for complete self-training materialsHydroCAD 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 Haviland Drainage Products

Setting up a pond to use Haviland pipe storage is a simple process:  Just pick the desired pipe size from the drop-down list, and specify the number of "chambers" (pipe lengths) plus their elevation.  The HydroCAD chamber wizard automatically calculates the overall size of the system based on the manufacturer's recommendations, or you can customize the layout to suit your specific requirements.

Technical notes

Size (in)
ID (in)
OD (in)
12 12.099 14.50 0.7984 1.0248
15 14.880 17.50 1.2076 1.5084
18 18.223 21.36 1.8112 2.2514
24 23.760 27.90 3.0791 3.8373
30 30.360 35.50 5.0273 6.2274
36 35.910 41.75 7.0333 8.6412
42 41.580 48.50 9.4297 11.6396
48 47.740 53.50 12.4306 14.4980
60 60.000 67.50 19.6350 23.0251

The HydroCAD storage values for Haviland Smooth Flow pipe are based on the actual inside diameter.  When calculating the pipe displacement, 35% of the total wall volume is considered to lie outside the pipe, so the displacement is reduced by this amount.

For further technical information, read about modeling corrugated plastic pipe.



Detailed product information

For detailed Haviland specifications and design information, please visit the Haviland Drainage Products.

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

Smooth Flow is a trademark of Haviland Drainage Products Co.
HydroCAD is a registered trademark of HydroCAD Software Solutions LLC
Product illustrations Haviland Drainage Products Co.


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