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  #1  
Old 04-07-2009, 08:58 AM
JeffNY JeffNY is offline
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Looking for something to stop/slow erosion here

Its not as steep as it looks, but theres 2 spots on this side that are kind of washing out, you can see in the picture. They have crownvetch planted all over the hill, and would like some more planted in the bare spots, but they're concerned with slowing this spot down so it doesnt wash away.

On the other side they had this problem, and stopped it by stacking some landscape timbers and holding them back by rebar.

I was going to try something similar on the other side, unless theres something better.


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Old 04-07-2009, 09:12 AM
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cgaengineer cgaengineer is offline
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Well we know the 4x4's didn't work so that's out of the question!

Have you considered filling, rolling and laying sod? Your other option is to terrace it or build a wall.
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Old 04-07-2009, 09:17 AM
JeffNY JeffNY is offline
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It goes down to the lake, I was standing on the 'seawall' taking the pics, so filling it really won't work, and a retaining wall at the bottom is out, because of the price factor.
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Old 04-08-2009, 01:19 AM
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castle555 castle555 is offline
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Looks like a 2:1 slope. Without terracing.
Use staked-down Jute Netting (use hoop stakes) across the slope. Place sections/areas of Rip Rap rock over Geofabric in the areas where water collects the most, or creat atrifical streambeds to carry water to lower areas. Then you can plant Lowfast Cotoneaster 2' O.C. or other similar ground cover type shrubs to take hold there.
Also place walk-on bark mulch to protect exposed sufaces.
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Old 04-08-2009, 01:32 AM
newtostone newtostone is offline
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I am liking the idea of rip rap, My mind went right to doing a zig sag up the whole way about 40" wide cut into (just to set a little stone not to cut terraces) And then use 4-6"stone and go to town, the jute mat will be the cheapest thing but wont work as well.

A completely different idea is to make a curtain drain of french drain across the top and have it to a central point in which it will then be carried down by a drain system. Altho the hill itself will still need some stone or hardy rooty ground cover to hold it down.

http://www.ext.vt.edu/pubs/envirohor...9/426-609.html
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Old 04-08-2009, 01:45 AM
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castle555 castle555 is offline
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Inmho

You might try Star Jasmine, Vinca Minor, or Asiatic Jasmine for a ground cover but don't rule out the Cotoneaster -not as invasive as the others and it spreads fast, looks great. I do like the idea of a french drain type application at the top to catch any surface water before it goes over the top ( the 3" ABS flex drain pipe is a nice touch therehttp://www.lawnsite.com/images/smilies/wink.gif) -if its built correctly Use the solid COEX drain pipe though, and leave the collection holes on the 'up' side. Always use a soil separator such as Geo-fabric or matting between dissimilar materials. The jute will be fine -its job is to hold the mulch in place until groundcover or shrubs can grow in.
Another idea is to plant some evergreen trees with good canopy to help protect the area from direct rainfall. However, you did say something about a lake so their view is probably important.
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Old 04-08-2009, 07:49 AM
JeffNY JeffNY is offline
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Ok, thanks for the responses, heres a few more little notes about it.

-They like the crownvetch, and want it covering the whole area
-They feel the water is seeping out of the hill, not just coming down over from the top.
-Trees are not an option because of the lake view
-Im thinking stone is out of the question because it has to look 'nice' from the lake. Theres a lot of lake traffic.
-They were afraid to 'dig' into the hill too much, thinking it might break it up and open it to more erosion.
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Old 04-08-2009, 08:01 AM
JeffNY JeffNY is offline
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Here's an overhead. Ignore that 'willowdale ln', theres no such road running through there.

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  #9  
Old 04-08-2009, 11:43 AM
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castle555 castle555 is offline
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Thank goodness for google earth

Wow, seeing the overhead shot really puts the scope of your task at hand in full view! Without real close observation possible, it looks as though a lot of surface runoff is coming from either side (the paved areas above) on edither side of the house.
In my experience, while cutting into a hillside to expand the space for a back yard and swimming pool, I cut into an elaborate sub-surface drain system installed by a major home developer at the base of a ridge to protect a row of homes below it from sub-surface artesian water. Now, it took a month to remedy, Engineering inspection and did not cost me a dime -nobody told us the line was there and the developer paid for a relocation we installed -pretty rare situation -Bottom line is that water can be handled properly.
In your situation -if ther is sub-surface water -locate it and take advantage of it create a dry rock bed or water feature artificial stream to the lake, and it will look really nice.
Consider using some large landscape boulders as islands on the slope -triangulate them in a five areas or something, with some rip rap -mix it up and it won't cost the owner as much but will really aesthetically nice from the lake.
For surface control and runoff, your best bet would be to create surface swales to direct the water to pickup points (suface drain grates and catch basins (9" probable) that tie into non-perforated drain pipe that can daylight into a rock bed near the lake edge on each side.
The other thing I'm seeing is the switch backs -take advantage of those and use the uphill sides at the bottom of each slope to the flatter area of the swithcback - install those surface swales and tie-in perforated drain pipe to the non-perfs -maybe a little garden block wall following the switch-back can create a runout at the base of each slope then use drain rock for filler over geofabric, over 3/4 crush over 20 mil plastic at the bottom.

________________ Top of 2' garden block wall
OOOOOOOOOOOO 1-1/2" to 2" drain rock
_______________ geofabric
ooooooooooo3ooo 3/4" crush rock
__________ 20mil plastic

A low wall traversing the slope would not be so visible from the lake.
This one got me on a rant -good luck with it.
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