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head above the weir crest at elevation 871.30. The resulting flow over the dam <br /> would be approximately 360 cubic feet per second (cfs). <br /> Q=3.087L (H)3"2 <br /> L = 136 feet <br /> H=0.9 feet <br /> Q=358 cfs <br /> The USGS flow record for the Elk River at ERCR 15 indicates flow between <br /> 66-111 cfs for a two week period around August 28, 1996 and 82 cfs on <br /> August 28, 1996 (see Appendix E). In addition, the daily operations log for the <br /> dam was obtained and it indicates a lake elevation reading of 871.6 which <br /> corresponds to a gage reading of 1.6 feet (see Appendix F). The above gage <br /> reading is consistent with the USGS flow record. <br /> • <br /> The above investigation concluded that the Lake Orono elevation was <br /> approximately 0.23 feet higher on May 5, 1970 than on August 28, 1996 (871.83 - <br /> 871.6 = 0.23 feet). The volumetric analysis comparing the 1970 and 1996 DNR <br /> lake surveys takes this difference into account. <br /> i <br /> N:W598\OVELKPJVERRPT-NCW 9 <br />