Laserfiche WebLink
Stream Channel Parameters and Changes <br /> Exhibit 55B Due to Longwall Mining-Induced Subsidence Page 17 <br /> then the changes were applied to the existing channel slope to determine the resultant post-mining <br /> channel slope. For purposes of determining changes in channel hydraulic characteristics, the <br /> channel slope near the lowest reach with predicted subsidence was used for calculations. <br /> Utilizing geomorphic channel regime relationships, it was determined that the changes to channel <br /> geometry shown in Table 5 would typically occur over a period of approximately three to five <br /> years. There is potential for more rapid channel change in localized areas depending on factors <br /> such as forest cover, soil saturation, and channel composition. The changes in depth and width <br /> are the maximum computed values considering both a slope increase and slope decrease. <br /> However, it should be recognized that the maximum changes in channel width and depth would <br /> not occur over the same channel reach. <br /> 831-032.921 Wright Water Engineers, Inc. <br /> December 2020 <br />