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A
new utility has been added to ICPR to automatically calculate stage-area
and stage-volume relationships based on manufacturers' geometric data for
various types and models of underground stormwater chambers. ICPR
currently supports underground chambers manufactured by:
StormTech
(models: SC-310, SC-740)
Cultec
(models: Contactor 100HD and Recharger 150, 180, 280, 330XL, V8)
The
underground chambers are somewhat similar in shape to an arch pipe and are placed on a bed of stone. Stone is also used to
fill voids between chambers and for cover above the top of the
chambers. The combination of voids in the stone and the open space
in the chambers provide subsurface storage for stormwater
runoff.
©
StormTech, LLC
Modeling
an underground chamber system is a relatively simple matter in
ICPR. It is modeled the same as any other pond. However, the
key to modeling these systems correctly is in developing the stage-area or
stage-volume table for the node used to represent the chamber system.
The
following step-by-step instructions guide you through the process.
You must have ICPR version 3.10 or higher installed for this to work.
1.
Open a node data form inside ICPR and set the type to either
stage-area or stage-volume. With the node data form opened,
click Utilities>Chamber
Tool as shown
to the right.
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2.
A chamber calculation data form opens. You need to select the
manufacturer from the drop down list and the model for the chamber
you wish to use.
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3.
Next, fill out the remaining data fields. Note that the
chambers must fit completely (horizontally and vertically) into the
gravel pit, otherwise an error will occur. Once the data
fields have been filled, click the "Calculate"
button.
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4.
A stage-area-volume table will appear to the right of the input
parameters. You might need to scroll down to the bottom to see
all of the points. If the total volume is inadequate, then you
can make adjustments as necessary until you find a combination that
works.
Note:
The stage-area table extends only to the top of the stone and does
not include surcharged conditions above that point. If you
want to account for flooding above the underground storage system,
you must add additional data points. This can be done in the
ICPR node data form.
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5.
If you're satisfied, then click the Ok button as shown to the right.
If the node type is set to stage-area, the areas will be converted
to acres and transferred automatically to the data form. If
you have a stage-volume node type, then the volumes will be
converted to acre-feet and transferred to the node form. |
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5.
Note that the last chamber selection parameters are placed into the
comment field as a record of the stage-area or stage-volume
calculation. |
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6.
A graph of either the final stage-area or stage-volume relationship can be viewed by clicking
the "Display" or "Display Z/V" button in the
node data form. |
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