Now the USBM equation for the particular site is
v=47.92[R/√QMAX]-0.5529.
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The above equation has been used for the prediction of PPV of 20 data sets. Fig. 6 shows the measured and predicted PPV by USBM equation in 1:1 slope line. It shows wide variation from the 1:1 slope line and indicates poor correlation between measured and predicted values of PPV.