Our backyard contains the catchment basin for the entire project where we live. The basin is a good rain gauge. The basin which is about 20 by 60 feet can fill in eleven minutes. Once full it overflows and down the hill the water goes. The concept is too keep a surge of water from going downhill. The basin drains itself by soaking the water into the ground. Usually in 36 hours the basin is dry again. Since it periodically fills with water landscaping the basin poses a problem. Slowly it is becoming grassy, but there must be a better solution.
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