雨水滲透量計算

If rain falls at a rate of 25 mm per hour, on a clay loam soil with an infiltration rate of 8 mm per hour, what would be the depth of the puddle after one hour? if this puddle spread over 10 hectares, how many mega-litres would you have as runoff after two hours? show all of your working.
更新: 請問有人知道要如何算嗎?
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