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II .I Sedimentation and Water Quality ty Analyses <br /> A. SEDIMENTATION RATES <br /> Sedimentation rates were calculated by the following two methodologies described below: <br /> • Volumetric comparison of 1970 and 1996 DNR lake surveys <br /> • Sediment loading analysis based on monitoring data and literature values <br /> 1. Volumetric Comparison of 1970 and 1996 DNR Lake Surveys <br /> The following results were calculated as accurately as the available data allow. However, due to <br /> • the level of detail associated with the surveys (especially the earlier one), the analysis has only a <br /> limited ability to observe small changes in lake volumes. The calculated sedimentation volumes <br /> and rates should not be viewed as being accurately quantified, but instead providing an indication <br /> of whether or not there have been significant lake volume changes over the 26.3-year time period <br /> between surveys. <br /> The volume comparison implies a net fill within Lake Orono of 181,000 cubic yards. This <br /> represents an annual deposition of approximately 6,900 cubic yards. Spread evenly over the 254- <br /> acre lake, it represents a deposition rate of 0.017 feet/year for a total deposition of 0.44 feet over <br /> the 26.3-year time period between surveys. These results correspond to low deposition for a lake <br /> and a reservoir. <br /> • <br /> N:\0598W I\ELKRIVER.RPT•NCW 1 0 <br />