Online modeling of calculation of channels of the most hydraulically advantageous cross-section

The question of determining the depth of uniform movement is an integral part of many hydraulic calculations of open channels and various hydraulic structures. It is also necessary to know it when constructing free surface curves, determining their length, and studying the forms of conjugation of headwaters. For uniform motion to exist, a number of conditions must be met: the channel must be prismatic, the roughness of the bottom and walls of the channel must remain unchanged, the slope of the bottom of the channel must be positive (i > 0). The depth along the stream also remains unchanged. The paper presents a program for online calculation and modeling of the parameters of a trapezoidal channel of the hydraulically most advantageous shape, which includes a client and server part. The program is implemented using CGI technology [5-9] in the PERL language at the link https://www.k123.org.ua/jeh4.html. Access protection to the program code and filtering and analysis of correct input of the output data are implemented using regular expressions. The program is designed taking into account modern requirements for mobile development: minimization of the code volume and compact format for displaying static and dynamic information, graphic output is presented in the vector format SVG.