Interactive engineering model
Culvert geometry and full-barrel capacity screen
Solve Manning normal depth in a circular or box barrel from the design flow, then watch the water surface, barrel slope, inlet treatment, and tailwater pool respond alongside the exact full-barrel capacity screen.
Preparing the 3D model...
A cutaway barrel passes through a roadway embankment between an approach channel and an exit channel. The water inside is a true cross-section prism drawn at the Manning normal depth solved from the design flow, and the tailwater slider raises a pool against the outlet. Readouts report full-barrel capacity, normal depth, and velocity only; no headwater or governing-control regime is computed.
Focus the 3D view and use the arrow keys to orbit, plus or minus to zoom, and Home to reset the view.
Text explanation and non-WebGL fallback
A cutaway barrel passes through a roadway embankment between an approach channel and an exit channel. The water inside is a true cross-section prism drawn at the Manning normal depth solved from the design flow, and the tailwater slider raises a pool against the outlet. Readouts report full-barrel capacity, normal depth, and velocity only; no headwater or governing-control regime is computed.
Important: This is not an inlet-control, outlet-control, headwater, or final FHWA HDS-5 determination. Verify both control cases with the applicable FHWA procedure and project data.
The numeric controls and readouts remain usable if WebGL is unavailable. Drag or swipe the 3D view to orbit and use a wheel or pinch gesture to zoom. With the 3D view focused, use the arrow keys to orbit, plus or minus to zoom, and Home to reset. The complete numeric lesson is also keyboard-accessible in the adjacent controls and readouts. This model is an educational aid and does not replace applicable design standards or professional review.