Here is the facts from a Hydrologist. When land is developed from pristine to industrial, the runoff increases by a factor of 4 according to the SCS method, Now, take land that is riddled with igneous or metamorphic outcrops and the "good" land is developed it is possible for a watershed in Duluth to hit near 98% of all precipitation to be runoff. Therefore, the trick is to capture the water and keep it where it fell ...more »
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