Rectangular channel hydraulic radius

Calculates hydraulic radius from flow area and wetted perimeter.

Calculates open-channel flow with Manning equation from area, hydraulic radius, and slope.

Calculates rectangular channel flow area from width and depth.

Calculates rectangular channel wetted perimeter from width and depth.

Calculates auxiliary open-channel flow from area, hydraulic radius, slope, and Manning coefficient.

Calculates critical depth from flow rate and rectangular channel width.