Visually design open-channel waterways, culverts, irrigation channels, sluiceways, and flumes. Quickly plot water surface profile, compute critical and control depths, and export results to Excel. Uses the industry-standard Manning's equation and numerical integration. Computes water-surface profiles, subcritical or supercritical flow regimes, and channel depths. Supports both English and SI (metric) units. Good user's notes are included as online help, and upgrades are always free