Ogee Spillway Designxls Better -

An ogee spillway is a commonly used hydraulic structure for safely conveying excess water from a reservoir or dam to the downstream channel without causing overtopping or structural damage. Its profile, characterized by a smooth, curved crest resembling an “S”-shape when viewed in section, is shaped to match the lower nappe of a free-flowing jet of water. This matching reduces flow separation and energy losses, producing a more efficient and stable overflow condition.

The theoretical discharge coefficient (( C_0 \approx 3.97 ) to 4.1 in SI units) changes based on actual head (( H )) vs. design head (( H_d )). If ( H/H_d > 1 ), the coefficient actually decreases. Manual correction tables (USACE EM 1110-2-1603) are cumbersome. ogee spillway designxls better