Assertion: reservoir's water level | /r/HasProperty | lowered after september
Facets:
value: further
type: MANNER
value: to provide necessary water storage capability
type: PURPOSE
Source sentences:
text: Throughout the summer, the water level is lowered by up to 3 feet (0.91 m) to provide for downstream irrigation needs, and is further lowered after September to provide necessary water storage capability to prevent possible downstream flood damage during the Willamette Valley's rainy season.