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i ~ • • <br />ten year record period. The T-year event associated with your <br />stream flow records should have been verified by an analysis of <br />rainfall records during that period.) <br />D. Rainfall Records (Methods are available to define a T-year <br />event given enough valid rainfall data for the area. Knowing the <br />T-year rainfall event and the corresponding stream flow observed, <br />would verify that a given stream flow is the result of a T-year <br />event.) <br />II. variation Due to Basin Characteristics (comparison of two similar <br />or dissimilar watersheds) <br />A. Main-channel slope (including the variation throughout the <br />watershed) <br />B. Drainage area <br />C. Percent of basin covered by lakes, swamps, depressions <br />D. Comparison of mean annual precipitation <br />E. Comparison of T-year 24 hr. rainfall <br />F. Average degrees below freezing <br />G. Orographic factors (mountain distribution, height, windward <br />or leeward watershed. <br />H. Elevation differences <br />I. Main channel length <br />J. Ratio of runoff to precipitation <br />X. Mean annual snowfall <br />L. Rainfall runoff vs. snowfall runoff <br />M. Differences in antecedent moisture con di tons <br />N. Rainfall distribution <br />O. Basin shape differences (which affect time of concentration, <br />rainfall distribution, etc.) <br />P. Geology (affecting infiltration-runoff characteristics, stream <br />recharge) <br />Q. Soil types (affecting infiltration-runoff) <br />R. Vegetation <br />(3) <br />