Hydraulic resistances of derivation channels of hydropower facilities

Currently, many authors have studied the uniform axisymmetric pressure head laminar and turbulent movement of water in hydraulic smooth rough (with roughness) pipes circular cross-section. The results obtained study a plane-parallel flow channels allow here only to outline structure corresponding dependencies clarify simplest case unpressurized fluid movement, when this can also be reduced or, other words, channel infinitely large width with flat bottom. In all cases, way solve problem is experiment. But possibilities experiment are limited, as number cases debatable, information accumulated date on free-flow motion various cross-sectional shapes. shapes has been completely insufficiently studied. construction numerous watercourses, well machine pumping stations, requires scientifically based calculation methods. For correct establishment methods, sufficiently deep physical essence phenomena occurring derivation necessary. extensive hydroelectric power plant (HPP) channels, HPPs