Deadrise is the angle (measured in degrees) at which a boat's hull bottom rises from the keel to the chine, relative to a flat horizontal plane. It defines the "V" shape of a hull, with higher angles cutting through waves smoother and lower angles offering better stability and shallow-water capability.

Key Aspects of Deadrise:
Measurement Location: Often measured at the transom (rear), with higher angles (20–25 degrees) indicating "deep-V" hulls for rough water, and lower angles indicating flat-bottomed boats.

Variable Deadrise: Most boats have more deadrise (steeper V) at the bow for cutting through chop, which tapers to less deadrise at the stern for faster, more stable planning.

Performance Impact: High deadrise allows for a softer ride at speed but requires more power and is less stable at rest. Low deadrise offers superior stability at rest and shallow draft but can result in a harsh, pounding ride in choppy water.

Chesapeake Bay Deadrise: A specific type of traditional, engine-powered workboat characterized by a sharp deadrise, often featuring cross-planked wooden construction.