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    Table. 4 Months with Highest Received Precipitation for the City of Redfield, SD.

    Month

    Avg. Precipitation (in.)

    Avg. days with .1 in. or more

    Avg. Snowfall (in.)

    May

    2.98

    6

    0

    June

    3.17

    5

    0

    July

    3.05

    5

    0

     

    Table 4. is a reduced portion of Table 3. that was shown in the results section. This section of the table is very important because it shows the months in which the most precipitation is received for the city of Redfield, SD. From the studies it was determined that the James River and its tributaries, such as Turtle Creek, mainly flow during periods of snowmelt and high rainfall. The river has a highly varying flow pattern. This section of the tables verifies that peak runoff will occur during the months of May, June and July. Peak runoff may also occur in April if the temperature rises high enough and there was a large amount of snow cover from the previous winter.

    Table 5. Peak Flows for the Turtle Watershed 

    Subwatershed

    Recurrance Interval: 2yrs (cfs)

             5yrs (cfs)

            10yrs (cfs)

    Wolf Near Ree Heights

    30

    226

    641

    Matter Creek

    15

    102

    245

    Shaefer Creek

    82

    334

    694

    Shaefer Creek Tributary Near Orient

    37

    117

    190

    Shaefer Creek Tributary Near Miller

    17

    65

    130

    Turtle Creek

    101

    846

    2820

    Medicine Creek

    166

    642

    1280

    Pearl Creek

    75

    360

    800

    South Fork

    55

    280

    600

     

    Table 5. displays the runoff values for the 2, 5 and 10 year storm. For this study, Turtle Watershed was broken up in several different subwatersheds. As you can see from the 2 year storm data, Turtle Watershed does not see alot of flow. Max peak flow occurs in the Medicine Creek subwatershed and only reaches a flow of 166 cfs. This low flow confirms statements made earlier about varying flow patterns. For the 5 year and 10 year storms the highest peak flow is located in the Turtle Creek Subwatershed. Turtle Creek is a tributary of the James River and when high peak flows are reached Turtle Creek will overflow its banks and flood the surrounding area. The lowest peak flows for the 5 year and 10 year storms occur in the Shaefer Creek Tributary near Orient

    The Turtle Watershed has a relatively small amount of water for the amount of acreage that it covers. The “Jones Lake and Turtle Watershed” report found that only 1% of the Turtle Watershed is covered by water. Also, for most of the year, streams in this watershed remain wet because some tributaries contain segments where stream channels are below the water table. At these sections a permanent pool of water exists. Stagnant ponds can be found throughout the Turtle Watershed during the dry months of the year.

    Table 2. ,from the results section, provides information about the erosion factors for clayey soils in the watershed. The permeability, organic matter in the soil and the erosion factors were found in a study on soil in Spink County. With the provided K values and other factors such as R the rainfall anderosivity index, LS the slope steepness and length factor, C the cover management, and P the conversion practice factor, one could determine the average annual loss in soil for the Turtle Watershed. Numbers for the variables can be found in the Trimble and WardE text that was previously referenced.

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