What is TR-55 Peak Discharge Calculator?
Graphical peak discharge method following USDA NRCS TR-55 for estimating post-development flows and comparing pre/post scenarios.
When would you use this?
- Site development studies that need a documented TR-55 style peak discharge.
- Comparing pre- and post-development hydrology for stormwater submissions.
How Delta Hydro Studio handles it
- Structured TR-55 workflow with clear inputs for curve numbers and time of concentration.
- Complements other peak-flow methods available in the suite.
How to use it
- 1
Launch the TR-55 calculator in the studio.
- 2
Enter drainage area, runoff curve number, and rainfall distribution inputs.
- 3
Provide time of concentration (or derive it using the Tc tool).
- 4
Run the calculation and export the summary for your memo or report.
Methodology & references
Full equations, assumptions, and literature references appear inside the in-app methodology panels for this tool, aligned with South African guidance (SANRAL TRH, SANCOLD, DWS technical manuals) and international references (USDA NRCS, FHWA HDS) where applicable.
Outputs & exports
Export professional Word and Excel report packs, tabulated results, and GIS-friendly layers depending on the tool. Screenshots in marketing materials are refreshed as the UI evolves — the studio always reflects the latest layout.
Ready to run TR-55 Peak Discharge Calculator?
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