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Debris in Sewers

Debris in Sewers

Debris in Sewers

(OP)
Is there any basic formula to use to estimate debris deposits in a sewer?  I'm concerned about a location where there is a change in slope from a very steep slope to a mild slope.  I have values for seddimentation in the same line (with a different slope) at an upstream location.

RE: Debris in Sewers

There are formulas for solids deposition, thay are called siltation formulas.  These formulas are the basis of the minimum 2 fps velocity that is recommended in sewers.  If you follow this rule, you typicall should have no problem.  I say typically because I have found such things as VW Bettles in sewers, and 2 fps would just not keep the bug is suspension.

BobPE

RE: Debris in Sewers

(OP)
The line is already in place and its velocity is significantly less than 2 feet per second.  This effect is increased by the change in slope since all the debris coming down the steep slope accumulates right there.

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