|
Incident ID |
SC01800-3131 |
|
Dam Name |
MOON LAKE DAM |
|
Downstream Hazard Potential |
H |
|
State |
SC |
|
Incident Date |
06/01/2018 |
|
Incident Type |
Non-failure |
|
Incident Driver |
Deterioration Or Poor Condition |
|
Incident Mechanism 1 |
Spillway Erosion/head Cutting |
|
Incident Mechanism 2 |
|
|
Incident Mechanism 3 |
|
|
Incident Description |
A late spring storm apparently caused severe head cut erosion at the downstream end of the auxiliary spillway. Spillway erosion occurred sometime in the Spring of 2018 - exact date is unknown. County imagery shows the headcuting just starting around 3/8/2018 and Google Earth imagery shows highly progressed headcutting by 6/3/2018. The Department became aware of headcutting in late June 2018 when very little dam crest remained to prevent a breach. |
|
Named Hydrologic Event |
N/A |
|
EAP Enacted (Y/N) due to Incident |
No |
|
Fatalities (Number) |
0 |
|
Number of People Evacuated |
0 |
|
Number of Habitable Structures Evacuated |
0 |
|
Number of Habitable Structures Flooded |
0 |
|
Other Infrastructure Impacts |
|
|
Economic Damages (in $) |
|
|
Volume released at failure (ac-ft) |
|
|
Response |
The State issued an Emergency Order to require the dam owner immediately lower water level under direction of a licensed Professional Engineer, submit a detailed investigation by a licensed Professional Engineer, and submit a Plan of Action for the repair |
|
Additional Remarks or Updates |
|
|
Incident Time |
|
|
Incident Duration |
|
|
Incident Report Produced |
|
|
Information Sources |
SC Dam Safety |
|
Owner Type |
P |
|
Dam Type |
RE |
|
Primary Purpose(s) |
PR |
|
EAP |
Y |
|
Year Completed |
1969 |
|
Year Modified |
0 |
|
Dam Height |
22 ft |
|
Max Storage (ac-ft) |
74 ac-ft |
|
Surface Area (acres) |
7 acres |
|
River Name |
TR-SOUTH TYGER RIVER |
|
Latitude |
34.9828 |
|
Longitude |
-82.2257 |
|
Regulatory Agency(ies) |
SC DHEC |
|
NID Number |
SC01800 |
|
Attachments |
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