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600598 Rainfall Intensities, 2-year 24-hour and 50-year 24-hour (P24,2 and P24,50) , In Inches, were determined for each basin from maps In USWB Tech. Paper No. 40 (Hershfield, 1961). Mean annual snowfall (Sn), In Inches, was determined for ea~h basin from a map by Flora (1948). Mean annual evaporation (Ev), In inches, was determined for each basin from a map of annual lake evaporation In USWB Tech. Paper No. 37 (Kohler and others, 1959). Mean minimum January temperature and mean maximum July temperature (T1 and T7), in degrees Fahrenheit, were determined for each basin from maps publ1shed in th~ USWB series (Climates of the States). The following flow characteristics were computed for each gaging station with natural flow and were used in the regression analys.ls. Mean annual flow (Qa) , in cubic feet per second, Is the average of the annual flows. Standard deviation of annual flow (SDa), in cubic feet per second, Is the square root of the,sum of the squares of the deviations from the average annual flow divided by the number of annual flows. " Average monthly flow (qn) , in cubic feet per second, Is the average flow for each month (ql for January, etc.). Standard deviation of monthly flow (SDn), in cubic feet per second, Is the standard deviation of the average flows for each month. Peak flow for n-year recurrence interval (Qn) , In cubic feet per second, Is the peak flow that would recur, on the average, once in n years. Minimum 7-day flow for n-year recurrence Interval (M7,n)' In cubic feet per second, Is the minimum average flow for 7 consecutive days that would recur, on the average, once in n years. High flow volume (Vm n), in cubic feet per second, Is the highest average flow tor m consecutive days that would recur, on the average, once In n years. The results of the regression analysis for 41 streamflow characteris- tics are shown In table 5. Equations that relate each flow characteristic 25