Underground water detention 2

[sully1234]

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

 

[Ussuri]

There are two general type of storm water detention tanks, either on-line or off-line.

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.

http://www.webookshop.com/asp/selected_publication.asp?idDepartment=1&idProduct=1358&idCategory=23

http://www.webookshop.com/asp/selected_publication.asp?idDepartment=1&idProduct=2551&idCategory=23

 

[SlideRuleEra]

ADS makes products for this application. Here is a link

http://www.ads-pipe.com/us/en/markets/stormretention.shtml

http://www.SlideRuleEra.net

 

[psmart]

... a number other companies also make storage chambers that can be embeded in stone such as

http://www.cultec.com

Some stormwater programs can automatically calculate the combined storage of the stone + chamber. For examples see

http://www.hydrocad.net/pondstore.htm

 

[bltseattle]

CMP can be used for tanks. The Handbook of Steel Drainage & Highway Construction Products has a lot of photos and detailed info to design connections, etc, and a company like Contech will help to design. The City/County/DOT where you are may have standard drawings for detention systems - in these parts there are many restrictions and criteria on allowable configurations and dimensions that must be met to be permitted.