hydraulics & stormwater

Choose the flow system.

Separate open-channel flow from closed-pipe losses, hydraulic controls, stormwater runoff, and static water pressure before selecting the equation.

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Hydraulic calculation groups.

Check the assumptions beside each tool, especially steady uniform flow, full versus part-full conditions, roughness, free discharge, and the selected empirical method.

Open channels

Manning flow, normal depth, and critical depth for simple prismatic channels.

Rectangular Manning flow
Trapezoidal Manning flow
Rectangular normal depth
Rectangular critical depth

Circular pipes

Gravity capacity, diameter, partial flow, and pressurised friction losses.

Manning full-pipe flow
Manning full-pipe diameter
Part-full circular pipe
Darcy-Weisbach head loss
Hazen-Williams head loss

Hydraulic controls & static pressure

Free-flow control and triangular static water-pressure distribution.

Rectangular weir flow
Hydrostatic wall pressure

Stormwater screening

Preliminary peak runoff for small catchments using a user-entered intensity.

Rational Method peak flow