Michael Cox wrote:Swales are also an excellent idea. You could make swales running on contour, branching off your drainage ditch to diver the water horizontally, rather than just charging down the slope. A gabion arrangement where the swale and ditch meet would probably be really effective. The swales fill in the storm then gradually percolate the water into the soil. They are really good for growing crops as they tend to have good soil water levels and not need additional irrigation.
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