National Dam Safety Program. Brisentine's Dam (Inventory Number VA 14720) James River Basin, Prince Edward County, Commonwealth of Virginia. Phase I Inspection Report

摘要

Brisentine's Dam is an earthfill embankment 28.4 feet high and 3550 feet long, with an 80 foot wide vegetated earth emergency spillway located adjacent to the left abutment. Brisentine's Dam is a side-hill embankment and the embankment forms the entire eastern and southern sides of Brisentine's Pond. The principal spillway is a 6 inch diameter corrugated metal pipe serving as a riser. The reservoir inlet is a 15 inch diameter corrugated metal pipe located at the western end of the reservoir. The dam, located approximately 9.5 miles west of Farmville, Virginia, is used for recreation. Brisentine's Dam is a 'small' size - 'significant' hazard structure as defined by the Recommended Guidelines for Safety Inspection of Dams. Using the Corps of Engineer's screening criteria for initial review of spillway adequacy, the 100-year flood was selected as the spillway design flood (SDF). The SDF was routed through the reservoir and found to reach a maximum water surface elevation 2.5 feet below the minimum top of dam. The spillway is capable of passing up to 60 percent of the Probable Maximum Flood without overtopping the crest of the dam. The spillway is adjudged as adequate.