NOVELTY - The turbine has a sole plate (6) placed in a bed of a watercourse, where control surface of the plate is raised above normal tail water elevation. A nozzle (3) is provided on a radial gate (2), and cooperates with the control surface for directing a jet of water such that the nozzle impacts vanes (8) at an angle normal to vane leading edges. A support plate is coextensive with each vane, extends from a distal end of the edge of one of the vanes to a base of the edge of a successive vane and defines a control surface for streamlining the jet when the jet approaches each edge.    USE - Undershot impulse-jet driven water turbine for generating electric power at low head watercourses e.g. irrigation canal drop structures, tidal estuary and navigation dam spillways.    ADVANTAGE - The vanes are configured to maximize the kinetic energy extracted from each jet such that the need for a separate core pipe is avoided, and numerous locations are enabled to generate electricity conveniently near points of use from a renewable source at minimum cost. The turbine can be pre-assembled for minimum installation cost at sites without impoundment and can be automatically raised clear of flood levels with built-in lifting equipment. The water turbine is inexpensive and designed for ease of shop fabrication and transportation at minimal expense. The water turbine is communicatively networked by different control systems along an entire irrigation system to enable automated monitoring of water flow and surface water levels at each radial gate, and to enable surface water levels throughout the entire irrigation system to be closely controlled for optimal water allocation while providing clear passage for fish migration.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for forming and streamlining a high velocity jet and reducing turbulent flow in an undershot impulse-jet driven water turbine.    DESCRIPTION OF DRAWING(S) - The drawing shows a vertical cross-sectional view of a water turbine generating unit.    Rotor (1)    Radial gate (2)    Nozzle (3)    Sole plate (6)    Vanes (8)