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Discussion Boards > Active Subjects > Messages as Posted > Landscape Design Forum

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06-03-2005, 14:43

Post: 111919

MacDaddy

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Join Date: May 2004
Location: Western NY
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DITCH PITCH

Just make sure your pipe size is at least as large as the next culvert downstream from yours (assuming it is reletively nearby). That way you have some insurance that it is sized properly to handle normal flow, as well as storm events. 1% is fine for a 15" pipe. You could even flatten it a bit if you need to. Though I wouldn't go any less than .5' drop invert-to-invert. You want to maintain flow at about 3ft/sec. which will keep the pipe clean. 1% (as you intended) should be good. Also consider installing 5-10' of medium stone rip-rap at either end. This will also help to keep out silts and sediments. Good Luck.

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06-06-2005, 07:22

Post: 111973

MacDaddy

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DITCH PITCH

1.25% should be fine. Generally, you match the proposed grade of your pipe with the existing grade of the ditch bottom (assuming the bottom has at least .5% grade). If you create too much of a drop, you will wind up regrading the ditch from the downstream end of your pipe until it daylights (hopefully still on your property). I guess what I am saying is that (1.% grade is PLENTY of pitch for a 15” HDPE pipe). Don’t make more work for yourself b/c you think you need to have it steep to convey flow. Also, if you can shallow the pitch of your pipe and create a free-discharge (little waterfall) on the downstream side, this will prevent back-silting.

I mentioned medium stone rip-rap before. I don’t know your situation. It may be overkill for a driveway culvert. These stones are about 75+lbs each and should be fine in almost all situations.

Also, make sure you have (at least) 1’ cover over the pipe, and depending on the weight of the vehicles crossing it, you should probably use select-fill under the driveway crossing. Gravel s/b fine for light traffic.

In our area, this type of work would be the homeowner’s responsibility. However, all future maintenance of the ditch would be done by the Highway Dept.

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