Assertion: continuous gully | /r/HasAspect | catchment area of 20
Facets:
value: in a gully system
type: LOCATION
Source sentences:
text: In a gully system or multiple-gully system all the main gully channels of continuous gullies (each continuous gully has a catchment area of 20 ha or less and its length is about 900 m) can be stabilized by boulder check dams.