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Stream Channel Parameters and Changes <br /> Exhibit 55B Due to Longwall Mining-Induced Subsidence Page 18 <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. <br /> 831-032.921 Wright Water Engineers, Inc. <br /> December 2020 <br />