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Much like a kilowatt or a therm serves as the basis for other utilities, the Equivalent Runoff Unit, or ERU, is the base unit for a stormwater utility. An ERU is a measure of the amount of impervious surface on a property. One ERU is equal to 2,628 square feet of impervious surface. This is the average amount of impervious surface found at the average single family residence in Athens-Clarke.
