Assertion: spillway's slope | /r/CapableOf | play role
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Source sentences:
text: Predicted large storm events, the slope of the watershed, the type of vegetation, and soils all play a role in the design of a safe dam including the top-of-dam elevation and adequate freeboard, which is the distance between the designed flow of the emergency spillway and the top of the dam, usually about 1 foot (figure 6).