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Slow bends in drainage

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MIStructE_IRE

Structural
Sep 23, 2018
816
Hi,

We’ve often used slow bends (15 degree) in underground drainage for surface water because it seems reasonable.. Is there a basis of design for slow bends or some guidance/reference as to what is acceptable?

I’ve never done this for wastewater though.

Thanks
 
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Don't believe so. The problem with bends is that it makes the drainage pipe difficult to clean. Cables are used to pull a cleaning head through the pipe and the cable will bind on the sidewall and destroy the pipe.
 
bends are not recommended (slow, long radius, or otherwise) for either surface water or sewer. If you want to put in an angle point in the pipe, than use a cleanout or manhole. not only is it difficult to clean, but more likely to clog with any sort of bend
 
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