roof runoff /drywell 1

[arabojan]

Hi guys
I want to control a commercial roof runoff with an area approxiamte 76815 sf by drywells, the requred storage volume is 7565cf and drywell discharge rate is 0.3cf/s, how i can provide the requred storage without building a swale over drywells with considering the facts that runoff doesn't need to treatment before infiltration into ground.
the minimum infiltration of soil is 1 inch/hour

 

[dicksewerrat]

Talk to ADS. They make a storage system that can be installed under the parking area.

Richard A. Cornelius, P.E.

http://WWW.amlinereast.com

 

[civilperson]

Collect the water in inlets and pipe to the dry wells. Use perforated pipes and bed the pipes in large and medium gravel bedding. The rate of the absorption of the soils is a function of the coefficient of permeability and water table elevation.

 

[tsgrue]

.

It appears you are describing a "soakaway", which seems to be a fairly common stormwater management option in various British Commonwealth countries. Below are a few links on these that might prove helpful...

Soakaway design and construction

http://www.pavingexpert.com/drain08.html

Soakaway serving small buildings

http://www.sbsa.gov.uk/archive/th_html2005/bsthnd-50.htm#5

SUDS infiltration devices

http://www.ciria.org/suds/infiltration_devices.htm

DrainSmart

http://www.drainsmart.co.uk

Soakaways

http://www.hughesconcrete.co.uk/hughes-productsb.html

Visual Soakaway Design 4

http://www.webcomsystems.co.uk/soakaway_design.htm

BRESOAK Soakaway design software

http://www.brepress.com/images/brebooks_mar07.htm

WinDes Micro Drainage

http://www.ecl.uk.com/contents/company info/products/software/microdrainage.html

.


tsgrue: site engineering, stormwater
management, landscape design, ecosystem
rehabilitation, mathematical simulation

http://hhwq.blogspot.com

 

[sschin]

Is out door (patio) dinning area floor drain needs to connect to storm drain or sewer drain system?

 

[cvg]

toilets, sinks, showers and any interior floor drains should be connected to sanitary sewer. Outside floor drains should generally be connected to storm sewer.

 

[PEDARRIN2]

If it is outdoor, they (code officials) would refer to it as a deck drain and it would go to the storm because it would get a lot of rainwater flowing to it.