| | 1: | | Title: | | | | | Volume/Number: | 2007 July | | | | Issuing Agency: | | | | | Description: | Over the 89-year history of Lake Hillsboro, approximately 36,500 tons of soil has been eroded from the shoreline areas. These shoreline erosion estimates equate to an average annual loading of approximately 410 tons/year. The total tons of delivered soil were calculated using a dry unit weight of 100 pounds per cubic-ft for undisturbed, native soil densities. The estimated loading to Lake Hillsboro based on the 2007 shoreline survey was estimated by extending the eroded bank into the lake at a projected slope of 3:1 (3 foot horizontal to 1 foot vertical) to form a typical triangular end area. Then, the length of the eroded shoreline in linear feet was multiplied by the projected end area for each degree of classification of erosion. | | | | Date Created: | 07 25 2007 | | | | Agency ID: | | | | | ISL ID: | 000000041059 Original UID: 21118 FIRST WORD: Illinois | |
|
