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paulz
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# Posted: 23 Nov 2017 12:16 - Edited by: paulz
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Should have taken a photo yesterday while I was there..
I have a 6 inch culvert pipe going under my road that is supposed to keep my shed from flooding, and never does. Yesterday I dug a big hole under and around the pipe entrance, that should take care of dirt and stuff, but what happens is floating branches and redwood duff clogs the entrance. Wondering what type of grate and how to situate it so it doesn't plug up.
Here is the shed. The culvert is just off to the right a few feet.
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Steve_S
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# Posted: 23 Nov 2017 22:06
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Maybe you could weld together a grate made from rebar ?
I'm sure you could buy a specific made grate but that would likely cost quite a bit I think. Not sure what else to suggest that would be cheap & easy.
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Greenland South
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# Posted: 24 Nov 2017 09:04
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I think part of the problem is your culvert is to small. A small 6" culvert will back up with very little debris present. Dig out the culvert and replace it with a 12 or 14" one.
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Just
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# Posted: 24 Nov 2017 10:30
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Lay a 4x4 ft of chain link fence over the top end of the pipe . that will give the trash a much larger area to plug. Then pick it up and give it a shake once in a while to keep it cleen.
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paulz
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# Posted: 24 Nov 2017 11:05
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Thanks guys. Yeah the culvert should be bigger but that won't happen this winter. I'm going to try a grate, or chain link fence (good idea!). Mainly wondering how to situate it and what size holes. There is an open trench about 30 feet long leading to the culvert, then a deeper hole around 3 feet diameter at the entrance. Branches and duff float down the trench, the branches create a dam and stops the duff, plugging the whole works. A grate laid vertical will just plug. Laid horizontal sounds better, but when the water lever is below the grate everything will just go under. Maybe at an angle, giving more surface area? As far as hole size in the grate, slightly under the pipe size should let anything through that can travel through the pipe, and resist plugging at the grate?
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AK Seabee
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# Posted: 24 Nov 2017 13:26
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You may have already installed check dams upstream if not try to intercept the debris before it gets to the pipe
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paulz
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# Posted: 24 Nov 2017 15:31
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No check dams, can you describe? Thanks!
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AK Seabee
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# Posted: 24 Nov 2017 19:10
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A check dam can be simple or engineered. What you are trying to do is slow down the energy of the water. Doing so will allow the silt, sediment and debris to settle before nearing your culvert. I have used rocks, straw bales or even vegetation as check dams.
If you google search check dams or erosian control devices it will give you an ideal on what you can do using items available locally.
Just mentioned screening the inflow end of the culvert and Greenland South mentioned increasing the size of the pipe. I would do both if it was me.
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paulz
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# Posted: 25 Nov 2017 10:07
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OK thanks, sounds like a great idea. I think the pipe might be 8" fwiw but no bigger. It runs diagonal to the dirt road it goes under and probably 30 ft. long, hate to dig it up. Anyway I think I'll try something like this.
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