|
Incident ID |
SC01869-3132 |
|
Dam Name |
CHATHAM LAKE DAM |
|
Downstream Hazard Potential |
S |
|
State |
SC |
|
Incident Date |
09/16/2018 |
|
Incident Type |
Non-failure |
|
Incident Driver |
Hydrologic/flooding |
|
Incident Mechanism 1 |
Overtopping |
|
Incident Mechanism 2 |
Erosion |
|
Incident Mechanism 3 |
Spillway Erosion/head Cutting |
|
Incident Description |
Heavy rainfall from Hurricane Florence caused dam to overtop. Primary spillway was clogged with debris prior to storm and low-level outlet was inoperable (valve stem missing). Downstream slope failure from erosion at toe exposed core of dam. Headcutting erosion at auxiliary spillway left an escarpment. |
|
Named Hydrologic Event |
Hurricane Florence |
|
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 |
Roads |
|
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 |
Manor Road was temporarily closed until water level was lowered to a safe level. |
|
Incident Time |
|
|
Incident Duration |
|
|
Incident Report Produced |
|
|
Information Sources |
SC Dam Safety |
|
Owner Type |
P |
|
Dam Type |
RE |
|
Primary Purpose(s) |
R |
|
EAP |
Y |
|
Year Completed |
1978 |
|
Year Modified |
0 |
|
Dam Height |
17 ft |
|
Max Storage (ac-ft) |
53 ac-ft |
|
Surface Area (acres) |
7 acres |
|
River Name |
TR-THOMPSON CREEK |
|
Latitude |
34.6732 |
|
Longitude |
-79.9104 |
|
Regulatory Agency(ies) |
SC DHEC |
|
NID Number |
SC01869 |
|
Attachments |
|
