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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />then divided by the total years plus one (the WiebulJ fannula given below) and multiplied by 100 <br />to give a percentage. <br /> <br />r <br />p~- <br />IJ+I <br /> <br />Where: <br />P = Recurrance Probability <br />R = rank~ and <br />N = total number of data records. <br /> <br />Equation 4 <br /> <br />The values are plotted on a semi-log graph with flow versus the Wiebull formula and the X-a'<.is <br />is reversed to create probability. A line of best fit is fixed to the values and an equation is <br />produced. The probability ofa loo-year flow is produced and entered into the equation coming <br />up with the tOO-year flow. The peak stream flow, rank. recurrence probability. and plot of the <br />Tongue Creek WeibuIJ Method are shown below. <br /> <br />17 <br />