Assertion: surface | /r/HasProperty | 12.5 to 15.5 feet
Facets:
value: above mean sea level
type: LOCATION
Source sentences:
text: The surface is 12.5 to 15.5 feet (4 to 5 metres) above mean sea level, depending upon the water level in the lake, and the average depth is 10 to 12 feet (3 to 4 metres).