From the developer: "Hicalc is a thought software package to quickly solve stationary flows in channels with rectangular, trapezoidal or cylindrical section. Solves stationary situations of Uniform Flow (example: infinite channels) and/or Flow Gradually Varied (example: backwater curves). It is not possible to be applied for Flow Space Varied (example: lateral garbage dumps) or Flow Quickly Varied (example: abrupt transitions). This program was made in Visual MS BASIC 6,0 and works under MS Windows 95 or superior."