GARRISONS LAKE DAM - DE00030-1204
Dam Name: GARRISONS LAKE DAM
State: DE
Downstream Hazard Potential: H
Incident Type: Non-Failure
Incident Date: 08/28/2011
Incident Driver: Hydrologic/Flooding
Incident Mechanism 1: Overtopping
Incident Mechanism 2
Incident Mechanism 3
Incident IDDE00030-1204
Incident DescriptionDam 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 EventIrene
EAP Enacted (Y/N) due to IncidentNo
Fatalities (Number)
Number of People Evacuated0
Number of Habitable Structures Evacuated
Number of Habitable Structures Flooded0
Other Infrastructure ImpactsNone
Economic Damages (in $)
Response
Volume released at failure (ac-ft)0
Additional Remarks or UpdatesAdequate 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.
Eroded areas were sandbagged on 8/29/2011 as a temporary measure to prevent further erosion.
Owner TypeS
Dam TypeREPG
Primary Purpose(s)RF
EAPN
Dam Height11 ft
Max Storage (ac-ft)1164.00
Surface Area (acres)86.00
Year Completed1964
NID NumberDE00030
River NameLEIPSIC RIVER
Latitude39.244
Longitude-75.5884
Year Modified
Regulatory Agency(ies)DNREC
Incident Time12:00 AM
Incident Duration
Incident Report Produced
Information Sources
