This document provides guidelines for the hydraulic design of small hydro power plants, including the design of head works and intake structures. It discusses three main types of head works: lateral intake, trench intake, and reservoir/canal intakes. For lateral intake head works, guidelines are provided on site selection, determining key elevations, layout, sizing sediment flushing gates, sizing intake trash racks, and designing diversion structures and spillways. References for further information on lateral intake and diversion weir design are also included. The guidelines aim to optimize hydraulic performance while balancing other practical constraints. Hydraulic model studies are recommended for important projects or unusual sites.