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 06-01-2005, 09:26 Post: 111800
lbrown59

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 DITCH PITCH

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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 06-04-2005, 08:54 Post: 111939
lbrown59

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 DITCH PITCH

1*Just make sure your pipe size is at least as large as the next culvert downstream from yours (assuming it is relatively nearby).
2* 1% is fine for a 15" pipe. You could even flatten it a bit if you need to.
3*Also consider installing 5-10' of medium stone rip-rap at either end
to help keep out silts and sediments.
MacDaddy
===============
Thank you for your above reply.
It was much appreciated as it was very informative & helpful for me.

1*The 15 inch was approved on my permit.
2*I have decided on a 3" drop for each 20 foot culvert thus the lower end of the 100 foot run will be 15 inches lower than the upper end rather than the 12 inches I had originally planed on. The result is a pitch slightly greater than 1 %.
3*The state told me they may do just that in the 75 feet of ditch from the upper end of the culvert to the upper edge of my property line.
This has given me second thoughts about the whole culvert project and makes me wonder if I'm taking on the states responsibility to maintain the road way ditch by installing the 100 feet of culvert!
I have a question about the stone rip-rap - How do I prevent the stone from washing into the culvert in a real gully washer?







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