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RE: detention basin

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Some more things to consider:


Outlet flow control structure (oriface pipe),

Emergency overflow (spillway or ?),

If open-topped, sloping sides or guardrail around top,

Does it have to be accessed by a vehicle for maintenance?


King County (Washington State) Surface Water Management used to publish guidelines for det. basins, maybe they have something on-line.




Bob Garner


From: Gary Loomis [mailto:gloomis(--nospam--at)]
Sent: Thursday, September 07, 2006 3:22 PM
To: seaint(--nospam--at)
Subject: RE: detention basin


ACI 350 and PCA documents would be a start.  I am not at the office and can not remember the exact titles.


You need to consider it dry and the earth pressure on the outside, if the structure is below grade.  Where is ground water?  You may need to consider uplift.


ACI 350 and PCA documents address materials of construction.  With adeqaute cover of rebar and spacing of joints to minimize cracking, epoxy coated rebar may not be necessary. 


Gary Loomis


From: amanipula [mailto:amanipula(--nospam--at)]
Sent: Thu 9/7/2006 5:15 PM
To: seaint(--nospam--at)
Subject: detention basin

I'm being asked to design a detention basin for a civil engineer.  the hydrology has already been done, he just needs structural detailing/design.  Having never done anything like this, i naturally have a few questions that i hope some of you may be able to answer.



1.  I tried searching for some sort of standard of design, but came up empty handed.  Do any exist?  Sources?


2.  I assume i'm just designing a big conrete box to hold water (19' wide x 53' long x 6.5' deep).  So Live Load would be the full volume of water, or can i consider something less?


3.  How about lateral loads?  How do i account for the water sloshing about?


4.  Should this be constructed w/ corrosive resistant materials? 


Any insights, thoughts, help is appreciated.





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