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 here. Users 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.
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.
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
| Nominal Size (in) |
Actual ID (in) |
Actual OD (in) |
Storage (ft/ft) |
Displacement (ft/ft) |
| 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.