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— Tailwater submergence reduces discharge capacity. If downstream conditions can back up onto the spillway, your spreadsheet must account for this through reduced discharge coefficients or submerged weir equations.

Using Excel, an ogee curve is generated, and the discharge capacity is calculated using empirical formulas. The hydraulic performance of the spillway is then analyzed using the Manning's equation, and the design parameters are optimized using Solver.

Spillway design depends heavily on the Design Discharge Head ( Hdcap H sub d

Remember the two equations?

— A well-designed ogee spillay spreadsheet costs a fraction of specialized hydraulic modeling software, yet it delivers comparable accuracy for most preliminary and detailed design tasks. For design firms, consultancies, and educational institutions operating under budget constraints, this accessibility is transformative.

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