Calculating CULTEC Chambers When Used For Residential Downspout Drainage
CULTEC Chambers may be used in residential applications to control roof drain runoff. The chambers collect and store rainwater underground collected from gutters and roof leaders until the soil is able to accept it back into the ground. Their low profiles and high volume capacities make them ideal for smaller installations. Puddles and saturated soil are eliminated as water is diverted into the chamber(s) and recharged into the ground.
Calculations
Roof Area (ft2) X 1 inch [1] = Volume (ft3)
No. of downspouts 12 inches/ft
Volume (ft3) = No. of CULTEC Chambers required per downspout
ft3/ unit
Use measurements from the table below based on which unit you want to use.
Choose the Contactor® or Recharger® model with volume required and whether or not you want to use stone. Always remember to order units in either Standard Duty or Heavy Duty specifications. Vehicular traffic loading will determine the type of model.
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Total Storage
Without stone[1]
ft3/unit |
Total Storage
with Stone[2] in
Non-Traffic Area
ft3/unit |
Total Storage
with Stone[3] in Paved or Unpaved Traffic Area
ft3/unit |
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Stone Placement |
No Stone |
6” stone base, stone up to crown of unit |
6” stone base, stone 6” above the unit |
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Model |
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Storage volume when used as single stand alone unit. No interlocking. Based on full length of Model R.
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Contactor® 100 Model R |
15.69 |
25.86 |
31.19 |
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Contactor® 100HD Model RHD |
14.93 |
25.40 |
30.73 |
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Recharger® 150 Model R |
22.53 |
36.08 |
41.60 |
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Recharger® 280 Model R |
48.63 |
66.73 |
73.67 |
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Recharger® 330 Model R |
55.94 |
77.67 |
84.92 |
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HVLV™ V8 Model R |
45.91 |
61.13 |
66.22 |
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Storage volume per chamber when using chambers in series. Interlocked together. Based on installed length.
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Contactor® 100 |
14.50 |
23.92 |
28.85 |
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Contactor® 100HD |
13.95 |
23.81 |
28.81 |
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Recharger® 150 |
19.87 |
31.83 |
36.71 |
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Recharger® 280 |
42.55 |
58.39 |
64.46 |
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Recharger® 330 |
46.61 |
64.72 |
70.77 |
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HVLV™ V8 |
40.94 |
55.12 |
59.71 |
[1] When using native soil and CULTEC No. 410™ Filter Fabric only.
[2] When surrounding in stone including separation requirement.
[3] When surrounding in stone including separation requirement.
[1] A design engineer or local building code official usually determines percentage of stormwater detention. The amount of necessary rainfall detention varies around the country anywhere from a percentage of an inch all the way up to 3" of rainfall per storm. They frequently base this measurement on your local 50 year or 100 year floods. It is always wise to check with local code to set sizing of detention systems
We are able to assist you in your design by performing preliminary calculations and supplying AutoCAD layouts free of charge.
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