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    Runoff from an area is calculated by the rational formula. To find the runoff, the area of drainage, average rainfall intensity, and the coefficient of runoff, C, are needed. The drainage area of the watershed was broken up into smaller subwatersheds. The drainage areas for various subwatersheds were provided in the study, “LAKE LOUISE /WOLF CREEKHAND AND HYDE COUNTIES, SOUTH DAKOTA,” conducted by Sean Kruger, Andrew RepsysC. The coefficient for the runoff was assumed to be 0.16 for a Class B soil with an average slope of 2%E. The average rainfall was provided in the same study mentioned above. Intensity can also be found by using the time of concentration equations. Once the time of concentration is found for a subwatershed, the information can be used to read the intensity off of a figure provided by the City of Sioux Falls Drainage Manual. The runoff potential for 2, 5, and 10 years were calculated and provided in the table1.The information was found by taking field measurements of each subwatershed to determine the drainage area. Rain gages were established to determine the amount of rainfall. Soil samples were taken to determine the classification of the soils within the area. The classifications and soil types are provided in “Soil Survey of Spink County,South Dakota.”

    The erosion study conducted determined the amount of erosion that could be expected from the watershed. Erosion may cause a depletion of organic matter, nutrients, and other properties that may be considered beneficial. The study,“Soil Survey of Spink County, South Dakota," was conducted by USGS and NRCS and the main focus of the study was to determine soil types present in the watershed. The samples were obtained from various areas of the watershed. These samples were tested for liquid limits, plastic limits, gradation, permeability, organic matter, and the erosion factors Kw, Kf, and T. 

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