Conveying water flow into the turbine with minimum energy loss also is important. Numerous design details must be considered, such as inlet geometry, trash racks, etc. [31]. References [1, 8, 10, and 31-37] contain a wealth of information about turbine siting, selection, hydraulic design, and optimization of hydropower plant. The number of large manufacturers has dwindled to just a few, but small – scale hydro plant justifies the use of comprehensive scale – model testing to finalize design details. See [31] for detailed coverage of hydraulic power generation.