GARRISONS LAKE DAM - DE00030-1204


Incident ID DE00030-1204
Dam Name GARRISONS LAKE DAM
Downstream Hazard Potential H
State DE
Incident Date 08/28/2011
Incident Type Non-failure
Incident Driver Hydrologic/flooding
Incident Mechanism 1 Overtopping
Incident Mechanism 2
Incident Mechanism 3
Incident Description Dam started overtopping around 4 am, and overtopping continued until 10 or 11 am. Overtopping flow was confined to one location and due to the clay core of the dam only minor erosion occurred.
Named Hydrologic Event Irene
EAP Enacted (Y/N) due to Incident No
Fatalities (Number)
Number of People Evacuated 0
Number of Habitable Structures Evacuated
Number of Habitable Structures Flooded 0
Other Infrastructure Impacts None
Economic Damages (in $)
Volume released at failure (ac-ft) 0 ac-ft
Response
Additional Remarks or Updates Adequate warning was provided to remove spillway flashboards several days prior to the storm to lower pond level in advance, which helped to minimize damage. Eroded areas were sandbagged on 8/29/2011 as a temporary measure to prevent further erosion.
Incident Time 12:00 AM
Incident Duration
Incident Report Produced
Information Sources
Owner Type S
Dam Type REPG
Primary Purpose(s) RF
EAP N
Year Completed 1964
Year Modified 0
Dam Height 10 ft
Max Storage (ac-ft) 1164 ac-ft
Surface Area (acres) 86 acres
River Name LEIPSIC RIVER
Latitude 39.244
Longitude -75.5884
Regulatory Agency(ies) DNREC
NID Number DE00030
Attachments