Culvert Sizing Calculator

Block B Services Limited

About this app

Culvert Studio is a free culvert calculator for sizing and capacity — box culvert, pipe, and multi-barrel design using Manning's equation and the Rational Method. Built for stormwater, drainage, and hydrology professionals across Canada, and provided as an educational showcase of our engineering-software capabilities.

WHAT YOU CAN EXPLORE
- Culvert sizing calculator: recommended culvert size, design flow, and velocity — in seconds
- Culvert capacity: inlet/outlet control analysis with performance curves and headwater checks
- Box culvert and multi-barrel, orifice, weir, and tidal-tailwater analysis for coastal culverts
- Manning's equation + Rational Method for peak-flow and stormwater runoff

OFFLINE CANADIAN IDF DATA
- 565 IDF weather stations across all 13 provinces and territories
- 28,900+ data points — rainfall intensity/duration/frequency curves, fully offline
- No internet required at the job site

VISUALIZE & VERIFY
- Interactive 2D/3D culvert profile with design-flow animation
- Velocity, HW/D, and compliance checks against NBC 2020 / CSA standards
- Save projects and calculations; export reports as PDF or GeoJSON/KML

MORE THAN A CALCULATOR
- Bridge hydraulics, fish passage, detention, channel, and drainage-network tools
- Environmental data integration: tidal (CHS IWLS), snow (ECCC), hydrometric (WSC)
- AI assistant explains every result step-by-step
- Bilingual English / Français

AN EDUCATIONAL DEMONSTRATION
Culvert Studio is provided as an educational, experimental showcase of what we can build — not as a substitute for professional design software. Always have results verified by a qualified engineer.

Built for Canadian conditions. Works offline.

If you work in civil engineering, drainage, stormwater, or hydrology, we'd love to hear from you. Request a feature, suggest an improvement, or contact us about a custom solution.