What min. Pitch for drive way culvert?? ?: Excavation  -- Home Building Discussion Forum and Review What min. Pitch for drive way culvert?? ?: Excavation -- Home Building Discussion Forum

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 06-01-2005, 08:00 Post: 111796
lbrown59

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 What min. Pitch for drive way culvert?? ?


I want to add 100' to my existing 40 foot driveway culvert.
Plan on using 5 20' joints of corrugated 15'' double wall smooth bore plastic pipe.

How much lower than the upper end should the lower end of the culvert be?

I'm thinking 12''.
Would that be enough or should it have more slope than that that?






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 08-22-2005, 18:34 Post: 115255
tekdivergeil



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 What min. Pitch for drive way culvert?? ?

12 to 18" should be plenty. You don't want to go too steep or it will clog with leaves, etc. Any grade shallow enough to only flow slowly is adequate.






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 08-26-2005, 15:04 Post: 115482
MacDaddy



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 What min. Pitch for drive way culvert?? ?

1% should be fine for a 140' of 15" cmp. I wouldnt go any less.

140 x .01 = 1.4' (say 18"Wink yeah right






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