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Stream Channel Parameters and Changes <br />Exhibit 55B Due to Longwall Mining-Induced Subsidence Page 18 <br /> <br /> <br /> <br />831-032.923 Wright Water Engineers, Inc. <br />December 2021 <br />CHANGES IN SEDIMENT YIELD <br />The mean annual sediment yield for each basin is not expected to change except for minor channel <br />cutting and filling over a period of three to five years or more. Overall, there will be a tendency <br />for these changes in sediment production to balance out within the basins. <br />As shown in Table 2, the mean annual sediment yield for the subject basins ranges from <br />approximately 30 to 90 cubic yards per year. These sediment yields are not expected to <br />change (i.e., increase or decrease) by more than about 5 percent due to any change in hydraulic <br />characteristics resulting from the increase in slope as identified in Table 4.