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Mr. Hamarat <br />February 17, 2015 <br />Page 2 <br />precipitation (PMP) event. The available flood storage capacity in the system at the time of <br />the survey significantly exceeds the storage requirement. However, this excess capacity will <br />decrease throughout the coming year as additional inflows to the system occur and a portion <br />of the storage space is filled with deposited tailing. <br />A relatively accurate determination of the flood storage capacity in the impoundment can be <br />made at the time of the surveys in May and October. An operations model has been <br />developed to estimate the flood storage availability in the system between surveys and is <br />updated by Henderson personnel on a monthly basis. One of the reports generated by this <br />model is the attached TSF Report (Table 3). This report shows the flood storage conditions <br />in the system on a monthly basis throughout the period from October 2013 to October 2014. <br />The last column of this table verifies that at least 3,582 acre -feet of storage capacity was <br />available throughout the period. The attached Figure 5A graphically shows the actual water <br />level in the TSF as compared to the "Hi -Hi" level in the pond, which is defined as the level <br />corresponding to 3,582 acre -feet of available capacity. Note that the actual water level did <br />not exceed the Hi -Hi level at any time in 2014. <br />If you have any questions regarding the enclosed information, or if you require additional <br />information, please call. <br />Sincerely, <br />W. W. Wheeler and Associates, Inc. <br />Steven M. Maly, P.E. <br />CC: Dillon Benbow, Henderson Mill (via e-mail) <br />Tim Haynes, Henderson Mill (via e-mail) <br />Curtis Brown, Henderson Mill (via e-mail) <br />R:\ 1300\ 1333\ 1333.00\ PROJECTS \PONDSRVY\Pond14Fallb4nnual Report\ 15feb17let .Hamarat.TSFReport.docx <br />