Free surface flow
The ARTS open channel analysis/design capability extends to the computation of uniform flow, gradually varied and rapidly varied flow in channels of rectangular, trapezoidal, U-shaped, V-shaped, parabolic and circular sections. It includes plotting of flow profiles in single channels and also multiple channels in series.

Illustrative output from the open channel analytical tools is presented in (a), (b), (c) and (d). (a) shows the interactive open channel computation property page dialog, which can be used for analysing single channel flow/gradient characteristics. (b) shows the water surface profile interactive computational dialog screen, which allows for both end and lateral (side weir) channel inflow and both upstream and/or downstream control. (c) shows the hydraulic profile for a set of channels in series, with the TWL printed on the screen graphic at the channel junctions. (d) shows the same set of channels, but with the display set to depths rather than TWLs.