Fluids, hydraulics and flows
Manning flow rate
Calculates open-channel flow with Manning equation from area, hydraulic radius, and slope.
Related calculators
Hydraulic radius
Calculates hydraulic radius from flow area and wetted perimeter.
Rectangular channel hydraulic radius
Calculates rectangular channel hydraulic radius from width and depth.
Froude number
Calculates Froude number from velocity, gravity, and characteristic length.
Manning open-channel flow
Calculates auxiliary open-channel flow from area, hydraulic radius, slope, and Manning coefficient.
Rectangular weir flow
Calculates rectangular-weir flow using a user-supplied discharge coefficient.
V-notch weir flow
Calculates V-notch weir flow from notch angle, head, and discharge coefficient.