The Authority owns and operates four regional flood control facilities which are classified by the Pennsylvania Department of Environmental Protection, Division of Dam Safety, as High Hazard Dams. These are dams so located as to endanger populated areas downstream by its failure.
An Emergency Action Plan has been developed for each of the four dams. A copy of the plans, including an inundation map noting areas subject to flooding in the event of failure, are available for public inspection at the office of the Chester County Water Resources Authority and the offices of the municipalities listed below.
The following municipalities have areas identified as being subject to flooding in the event of a failure of one or more high hazard dams (see map):
Chadds Ford Township (Delaware County)
East Bradford Township
East Brandywine Township
East Caln Township
East Fallowfield Township
Honey Brook Township
South Coatesville Borough
Upper Uwchlan Township
West Bradford Township
West Caln Township
West Nantmeal Township
Also, a portion of the unincorporated areas of New Castle County, DE
Map illustrating areas subject to flooding should a dam breach occur