Ogee Spillway Designxls Better [work] Jun 2026

: A robust tool simplifies data entry for critical variables like: Spillway Approach Height

This section calculates the x and y coordinates for the upstream and downstream curves, usually using the Bureau of Reclamation (USBR) formulas [1].

Q=C×L×He1.5cap Q equals cap C cross cap L cross cap H sub e to the 1.5 power : Discharge ( ogee spillway designxls better

The foundational hydraulics of an ogee spillway are deceptively simple. The discharge capacity (Q) is determined using a standard weir equation:

Applications and advantages

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.

Create a structured table that calculates individual points along the physical concrete surface. X-Coordinate ( Formula for X Y-Coordinate ( Formula for Y Manual Increment Upstream Curve Formula Upstream Face Manual Increment Upstream Curve Formula Upstream Slope Reference Zero Reference Zero Crest Origin Increment Step =-0.50*(X^1.85)/(Hd^0.85) Downstream Curve Increment Step =-0.50*(X^1.85)/(Hd^0.85) Downstream Curve Mitigating Cavitation Risks via Spreadsheet Analysis : A robust tool simplifies data entry for

You pull out your copy of USBR’s Design of Small Dams or EM 1110-2-1603 , flip to the discharge coefficient tables, and start punching numbers into a generic Excel sheet. You spend hours debugging lookup tables for the upstream face slope, fiddling with unit conversions, and praying you didn’t mis-type the design head (H(_d)) relationship.

The "designxls" approach to ogee spillways offers distinct advantages that make it demonstrably better than traditional methods: Its profile, characterized by a smooth, curved crest