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Ogee Spillway: Designxls Better ^hot^

ogee spillway

The design of an is fundamentally based on the shape of the lower nappe of a freely falling water jet over a sharp-crested weir. An efficient design ensures that the water profile remains in contact with the spillway surface to avoid sub-atmospheric pressures and cavitation. 1. Discharge Calculation

  1. Verify your legacy XLS: Run the XLS side-by-side with a known published example (e.g., USBR’s "Design of Small Dams" Example 9-1). If your XLS is off by >2%, trash it.
  2. Download HEC-RAS Mapper: It is free. Build a simple 2D mesh. Place an inline structure. HEC-RAS has a built-in "Ogee" spillway type. You select the design head; it draws the profile automatically.
  3. Write a wrapper: Keep Excel for the cost estimation ($/cy of concrete). Use a Python script to export the ogee coordinates. Paste those into Excel. Never let Excel calculate the hydraulics again; use it only for costing.
  4. Email the author: If you truly want a "better XLS," I have a template that uses LET and LAMBDA functions (Excel 365) to dynamically solve the energy equation without macros. It is safer, but still slower than HEC-RAS.

Option 1: The General Review (Editorial Style)

Hydraulic Efficiency

: The Ogee shape is optimized to maintain atmospheric pressure at the design head, preventing cavitation. Excel allows you to quickly iterate through different design heads to find the point where discharge efficiency is maximized. ogee spillway designxls better

To optimize the design of an ogee spillway, an Excel-based approach can be employed. The following steps outline the methodology: ogee spillway The design of an is fundamentally

  • The depth required for a hydraulic jump to form.
  • Formula: = -0.5 * d1 + sqrt( (d1^2)/4 + (2*q^2)/(9.81*d1) )

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. Verify your legacy XLS: Run the XLS side-by-side