Assertion: grassland | /r/HasProperty | focus
Facets:
value: for erosion
type: PURPOSE
value: for runoff
type: PURPOSE
Source sentences:
text: In such cases action may have to be taken to reduce runoff; in severe cases grassland that is a focus for runoff and erosion may have to be closed, temporarily or permanently, with or without forestation - this is being done on a large scale in China, notable in the Yellow River and Yangtze catchments.