Assertion: spillway's slope | /r/HasProperty | 10-20 percent
Facets:
Source sentences:
text: Flat to gently sloping, 0-5 percent 0.05 Moderately sloping, 5-10 percent 0.10 Rolling topography, slopes 10-20 percent 0.15 Hilly or steep, slopes 20-40 percent 0.20 Mountainous, slopes greater than 40 percent 0.25