Interactive engineering model
Manning partial-pipe geometry explorer
See how flow area, wetted perimeter, hydraulic radius, velocity, and discharge change as a circular pipe fills.
Preparing the 3D model...
A cutaway circular pipe exposes the wetted arc and filled segment. A specific-discharge plot marks the current relative depth and the capacity maximum near 0.94 D.
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 circular pipe exposes the wetted arc and filled segment. A specific-discharge plot marks the current relative depth and the capacity maximum near 0.94 D.
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.