If you cannot find a good free one, look for the "Alex Tomanovich" spreadsheets. He is well known in the structural community for creating high-quality, clean Excel tools (specifically for base plates and connections, but his methodology is a great template for building your own culvert sheet).
– Members share advanced spreadsheets with full calculation reports. box culvert design spreadsheet download better
Ensures the structure meets span-to-depth ratios. 🚀 Why Use an Excel-Based Tool? If you cannot find a good free one,
If your spreadsheet doesn't flag "high outlet velocity—scour protection required," it isn't better—it’s dangerous. Ensures the structure meets span-to-depth ratios
The rain came like a question mark across the valley, asking the old road how long it would stand. For years, the creek had been a polite neighbor: steady, predictable, never asking for more than a little channel at the base of the embankment. But the county was changing—more houses, more pavement, more water racing to find its way down—and the little culvert under Route 7 was groaning.
If you'd like, I can help you find a specific template based on: Your preferred (AASHTO, IRC, Eurocode) Whether you need precast or cast-in-place