Laserfiche WebLink
DRAFT <br /> <br />III. <br /> <br />Sedimentation and Water Quality Analyses <br /> <br />A. SEDIMENTATION RATES <br /> <br />Sedimentation rates were calculated by the following two methodologies described below: <br /> <br />Volumetric comparison of 1970 and 1996 DNR lake surveys <br /> <br />Sediment loading analysis based on monitoring data and literature values <br /> <br />1. Volumetric Comparison of 1970 and 1996 DNR Lake Surveys <br /> <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 /> <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 high deposition for a <br />lake, but Iow deposition for a reservoir. <br /> <br />N:\0598\01~ELKRIVER.RPT-rlb ] ] <br /> <br /> <br />