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What min Pitch for drive way culvert

lbrown59 Join Date: Sep 2004 Posts: 931 First Organized Permanent Settlement In The Northwest Territory.

2005-06-01          111796


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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What min Pitch for drive way culvert

tekdivergeil Join Date: Aug 2005 Posts: 11 Michigan

2005-08-22          115255

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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What min Pitch for drive way culvert

MacDaddy Join Date: May 2004 Posts: 95 Western NY   Pics

2005-08-26          115482

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

140 x .01 = 1.4' (say 18") ....

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