In the field of storm water management there is a need for a wide range of evaluation techniques ranging from complex to simple. To compliment detailed simulation techniques, so called mathematical or statistical techniques have been developed. Although complex in development, the statistical techniques are quick and simple to apply. This volume presents a comparison between two statistical techniques, a statistical analytical and a statistical moments method. The basis of comparison between the two methods is their ability to reproduce results obtained from detailed simulation. The comparisons for 5 U.S. cities indicate that both procedures exhibit apparent strengths and weaknesses. This volume provides basic information required to use either procedure.