Ogee Spillway - Designxls Better

Before we discuss the "XLS" advantage, we must recall the math. The upstream face of an ogee spillway is typically vertical. The downstream profile follows the trajectory of a free-falling jet:

[ y = -K H_d^1-n x^n ]

Where:

Deriving the tangency point between the crest curve and the downstream slope requires iterative solving. Doing this by hand takes 45 minutes per iteration. Using the Ogee Spillway DesignXLS, it takes 2 seconds. ogee spillway designxls better

Let’s test the query: Is there any scenario where classic ".xls" is better?

Winner: XLS only wins on initial speed. For safety, accuracy, and defensibility, the modern tools win by a landslide. Before we discuss the "XLS" advantage, we must

The constants ($n$ and $K$) change if the upstream face is sloped.

You have three options:

The Army Corps of Engineers can model an Ogee spillway in HEC-RAS in less time than it takes to format an Excel table. Deriving the tangency point between the crest curve

If you build the spreadsheet according to this specification, your "Deep Content" includes:

This approach moves the tool from a "calculator" to a "Design Optimization Tool."

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