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Joined: Jun 2005
Posts: 2,365
Lunker
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Lunker
Joined: Jun 2005
Posts: 2,365 |
joerocker,
The pure stuff (Portland cement) goes a long way. Each sack can cover around 8 square feet 4" thick. If you till it in shallow, it can be stretched a lot farther. I think I only used 3 sacks on a sloped 20x20' driveway that kept washing out. Since a spillway has little or no wheeled traffic, I think you could till in 1/4" of Portland to a depth of 1" and get away with it until the grass is well established. It all depends on the water depth and speed. If you can keep the water shallow (which prevents it from gaining speed)it's not critical. If the water gets deep and gains momentum, nothing less than high quality concrete will keep it from washing out.
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