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1

What is the current capacity of the soil and overburden. This will depend on the history of rainfall for the previous year or six. How fast can that surface absorb water? If you get 7 inches of rain in one hour (near my brother's house in N.M.) you get a lot more run off than if you get that same 7 inches in 7 days. I'm not sure how evaporation potential ...


2

Calculating river flow from rainfall - evaporation is a simplification. Firstly you are assuming that you can accurately measure rainfall, then that theoretical estimates of evaporation are correct which, given how much land cover and vegetation vary, is unlikely. Next consider the pathway from raindrop hitting the soil to the river. It's clearly not ...


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