valley scour asphalt shingles

Channel Dynamics: Comparing Scour Physics, Debris Wash, and Water-Bypass Thresholds in Steep-Slope Valleys

• September 26, 2026
• admin

In steep-slope roof hydrology, the valley is not merely an intersection of two planes—it is the primary convergent drainage channel of the entire roof. When two sloped roof planes meet at an internal dihedral angle, their catchment areas combine. Runoff that would otherwise sheet evenly across tens of square meters funnels into a narrow, high-velocity …