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05/08/17
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05/08/17
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2 <br />%·¤¢´³¨µ¤ 3´¬¬ ±¸ <br />The City of Ramsey contracted the Anoka Conservation District to complete an inventory of riverbank <br />condition along the entire 5.8 miles of City that border the Mississippi River. The inventory provides the <br />City with a comprehensive record of bank condition. Ten stretches of riverbank with severe or very <br />severe erosion were identified, which if stabilized, would reduce sediment loading to the river by 5,148 <br />tons per year. <br /> <br />The inventory is structured as this report as well as an atlas. The report provides details on the <br />methodology used to estimate bank erosion severity and potential benefits provided by stabilizing the <br />most severely eroding sections of riverbank. The 10 most severely eroding sections of riverbank are also <br />detailed in the report with individual site profiles to highlight additional information and potential <br />solutions. The atlas is presented in Appendix A and provides a complete record of aerial photographs <br />with the corresponding erosion severity categorizations and key pictures collected during the field work <br />portion of this effort. As not all pictures are presented in the atlas, the final deliverables also include the <br />complete picture inventory collected in early December 2015. <br />Methods <br />&¨¤«£ 7®±ª <br />The project scope was determined to be the entire 5.8 miles of City that border the Mississippi River. An <br />atlas of the target area was printed prior to conducting the field work to serve as a navigation tool on <br />the river and ensure complete coverage of the riverbank. <br /> <br />The inventory was conducted on December 10th and 11th, 2015. The timing was optimal because the <br />river level was relatively low, bank vegetation was dormant, and snow had not yet fallen to obscure the <br />bank. Other times of the year were considered for the inventory, but frequent high water levels in the <br />spring, dense bank vegetation in the summer, and river ice and snow on the bank in the winter all <br />prevented the collection of a useful picture inventory. <br /> <br />The inventory crew consisted of two Anoka Conservation District (ACD) staff members. A small boat was <br />used to navigate the river and take geotagged pictures using a handheld GPS. These pictures can be <br />viewed similar to pictures taken on a standard camera, but they also contain spatial information (i.e. X <br />and Y coordinates). This feature allows them to be accurately mapped in GIS software. In order to take <br />high quality photos, the boat navigated at idle speed typically between 50 and 100 feet from shore <br />depending on water depth. <br />7¨²¢®²¨ .2#3 $¨±¤¢³ 6®«´¬¤ -¤³§®£ " ª 2¤¢¤²²¨® 2 ³¤ #ategorizations <br />The picture inventory was used to digitize a polyline in GIS along the entire riverbank. Using the <br />Wisconsin NRCS Direct Volume Method, the polyline was classified as slight, moderate, severe, or very <br />severe with respect to erosion severity (Table 1). These erosion categorizations were then converted to <br />lateral recession rates using the table below for use in soil loss calculations. <br /> <br />
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