Underground water detention
Underground water detention
(OP)
Hello,
Could somebody direct me to a source that illustrates the design of underground water tanks for storm water detention for a small subdivision.
Thanks in advanced
Could somebody direct me to a source that illustrates the design of underground water tanks for storm water detention for a small subdivision.
Thanks in advanced





RE: Underground water detention
On-line tanks are basically a widening of the sewer system so that it provides storage capacity. I have work on jobs where this has been done three ways. The first is just to up size the pipe diameter, the second is to replace a length of sewer with box culvert sections (with a channel formed in the base) and the third system I worked with was a tunnel bored through a hill.
Off-line tanks are basically just large boxes offset from the line. There will be a manhole/weir arrangement upstream to control pass forward flows and spill flows.
In my neck of the woods on-line tanks are preferred as they are better at self cleaning than off-line tanks. The restriction is that there is often not enough room available to fit them in.
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RE: Underground water detention
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RE: Underground water detention
Some stormwater programs can automatically calculate the combined storage of the stone + chamber. For examples see www.hydrocad.net/pondstore.htm
RE: Underground water detention