Assertion: city's system | /r/HasProperty | prime importance
Facets:
value: always
type: DEGREE
Source sentences:
text: Because its saucer-shaped terrain lies as low as 5 to 10 feet (1.5 to 3 metres) below sea level and has an average rainfall of 57 inches (1,448 mm), a levee, or embankment, system and proper drainage have always been of prime importance.