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Rank the volume available to a <br />HUC over all the Mays in the last <br />40 years. <br />Surface Water Supply Index <br />Year Volume* of <br />water in HUC <br />NEP <br />1999 460,388 76.12 <br />1996 453,066 73.63 <br />1974 440,361 71.14 <br />1979 411,037 68.66 <br />1998 396,116 66.17 <br />1993 394,651 63.68 <br /> *Volume = Reservoir Storage + Forecasted Runoff <br />Year Volume* <br />of water in <br />HUC <br />NEP <br />May 1999 460,388 <br />May 1996 453,066 <br />May 1974 440,361 <br />May 1979 411,037 <br />May 1998 396,116 <br />May 1993 394,651 <br />Example Step 1: