Scaffs India drainage detailing.

The Drainage Discharge: Concentrated Flume Energy, Eave Corner Vortices, and Sidewall Deflection Mechanics at Valley Exits

• October 2, 2026
• admin

Across multi-hipped roofs, intersecting gables, and tiered veranda designs in South India, the most hydraulically stressed point on the entire building envelope occurs at the base of an open valley: the valley-to-eave termination. A roof valley functions as a sloped open flume, collecting runoff from two converging slopes and accelerating that volume downward under gravity. …