RPAs are designated areas along streams where buffers are required to protect the streams from development impact. Generally, floodplains are found within RPAs. The required vegetative buffers improve water quality and maximize infiltration. This reduces storm water runoff into streams. The County has several square miles of RPAs.

 

RMAs include floodplains, highly eroded soils and other sensitive areas. Our entire County is considered an RMA. Developers and builders working in an RMA are required to use best management practices, which are steps to minimize erosion, control runoff and prevent pollution. Many Prince William developers build storm water management facilities. These facilities incorporate the best management practices and help provide flood control.

 

The public was advised before the County adopted the Chesapeake Bay Preservation Act. They readily supported the act and continue to cooperate in programs designed to protect these vital stream buffers. Engineers and developers are cooperative as well and have followed all of our requirements.

 

A History of Floods in Prince William County

 

Prince William County has experienced major floods in 1937, 1942 and 1972. By far, Hurricane Agnes in 1972 was the largest flood and exceeded any predicted 100-year floods.

 

According to newspaper reports, the storm caused severe damage in the Manassas area. Major flood damage occurred to businesses, homes, boats and automobiles.

 

Mobile homes were literally washed away. Water washed over numerous bridges, including the one across Bull Run. Currents broke up the roads, and road damage was intensified by stopped up culverts and other drainage ways. As the water rose, 700 people were forced to abandon their homes.

 

In the Occoquan River watershed, the storm wreaked havoc and caused $8.7 million in damage. Most of the damage was to residential property ($2.2 million) and to transportation facilities ($3.5 million). Three deaths were attributed to the storm.

 

 

 

 

Flood hazards pose serious threats to life and property. Take the steps to safeguard yourself, your family, your home and your property. If you have questions about whether you live in a floodplain, or for more information, please call the Department of Public Works at 703-792-7070.