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9 <br />EQUIVALENT RESIDENTIAL UNIT (ERU) <br />SINGLE FAMILY RESIDENTIAL <br />•City’s GIS intern delineated <br />impervious areas on 900+ <br />residential properties <br />•Average impervious area = 3,913 SF <br />•Median impervious area = 3,556 SF <br />•1 ERU = 3,600 SF