Laserfiche WebLink
<br />SELECTED ALTERNATIVE <br />ENVIRONMENTAL QUALITY ACCOUNT (CONTINUED) <br />Sedgwick-Sand Draws Watershed <br />Colorado <br />Nebraska <br />Components Measures of Effects <br /> <br />4. Land damaged by floods will be <br />reduced as follows: <br /> <br />Storm Frequency <br /> <br />Acres <br /> <br />100-year storm <br />10-year storm <br />2-year storm <br /> <br />3244 <br />2702 <br />2016 <br /> <br />5. Reduced sediment going into the <br />canal system by 1328 tons per year. <br /> <br />6. Erosion scour to land on the flood- <br />plain will be reduced by an average <br />of 107,600 cubic yards annually. <br /> <br />7. <br /> <br />Disturbance on 33 acres of irrigated <br />cropland, 149 acres of non~irrigated <br />cropland and 179 acres of rangeland <br />",Iii -Increase-dust in-the-aii and-- _. <br />increase the erosion rate on the 361 <br />acres during installation of struc- <br />tural mea.sures. <br /> <br />8. Engine exhaust from construction <br />activities will add pollutants to <br />the air. <br /> <br />9. R~duced erosion and sedimentation <br />will reduce the probability of sedi- <br />ment pollution in the South Platte <br />River during large storms. <br /> <br />10. 502 acres above the dams, presently <br />rangeland, will be supject to peri- <br />odic flooding for periods of time up <br />to 10 days. <br /> <br />11. 33 acres of cropland will be con- <br />verted to f1oodways. <br /> <br />Part 2-5 <br />December 1975 <br />