A. The delineation of the Floodplain (FP) District may be revised by the Township of Marshall where natural or man-made changes have occurred and/or more detailed studies have been conducted or undertaken by the United States Army Corps of Engineers, the Soil Conservation Service or other qualified agency or individual which document the necessity for such change. However, prior to any such change, approval must be obtained from the Federal Emergency Management Agency (successor to the Federal Insurance Administration).