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PraticalGardener
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Joined: Sun Feb 11, 2018 1:02 pm
Location: Potomac Highlands region, West Virginia, USA (Zone 6a?)

Very steep all rocky bank erosion

How can this erosion be resolved? The concave eroded bank is right beside my driveway. The biggest section of it is 4 feet tall, and 7 feet from the base of the eroded bank. The surface is nothing but small rocks, and I think it gets about 5 hours of sunlight. It faces west, and is beneath a power line. It also has two small plastic pipe ends sticking out, one towards each end, the left one had water flowing out of it after a nice rain.
Above the eroded bank is a water break I can maintain in the sparse 'lawn'. Further up are mature White Oak trees, as close as 19 feet. The road is just uphill of the trees.

Picture: In progress. I will try again to post the pictures.
Image

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PraticalGardener
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Posts: 97
Joined: Sun Feb 11, 2018 1:02 pm
Location: Potomac Highlands region, West Virginia, USA (Zone 6a?)

Image. This show the main section of the eroded bank.

Image. This shows the length of the rocky bank. The camera is facing North.

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applestar
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Location: Zone 6, NJ (3/M)4/E ~ 10/M(11/B)

To my book-learned eyes, I feel like this situation is a candidate for series of terraced beds built WITH hugelcultur downslope and swales upslope.

These are elements of Permaculture.

…to be clear, I have no actual experience building something at this scale — all I’ve been doing have been suburban garden in very flat part of NJ, and my “slope” consists of grading between houses.

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PraticalGardener
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Joined: Sun Feb 11, 2018 1:02 pm
Location: Potomac Highlands region, West Virginia, USA (Zone 6a?)

Thank-you. I can give this a try.

imafan26
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Location: Hawaii, zone 12a 587 ft elev.

Because of the steepness of the bank. It is hard to prevent it from eroding. The best bet would be terracing, either by cutting the bank back or if you cannot do that, build a terrace in front of it. As Applestar mentioned, the terrace should be sloped slightly toward the bank so water will be directed toward the bank and not further eroding the edge. Where water naturally flows off the bank, you should be directing water from terraces to swales preferably to something like a collecting pond or a rain garden when there is heavy rain so it can capture any silt.

It sounds like you may not have a lot of space to reduce the grade of the slope. So you will need to make the terrace walls higher.

Your other options would be a retaining wall, but since there is a lot of weight it needs to hold back, it is better to hire a professional and make sure it is done with all the permits to make sure it meets specs. If you still have some room, it can still be partially terraced so you can get more use out of the space.

When we bought our house, we specifically looked for a lot that did not have a slope. Especially since we would have to pay taxes on a slope that is really not useable land without an expensive wall. We especially did not want to be downslope of a 30 ft embankment. Our neighbor had one that was hard to weed whack and when it rained heavily, the water came pouring down and pooled in his yard.



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