This document provides information on small hydro power plants, including their essential elements and working. It discusses that small hydro power plants can utilize small rivers and streams with little environmental impact. The key elements are a catchment area, reservoir, dam, turbines, draft tubes, power house, and safety devices. It explains that water is stored in the reservoir and flows through penstocks to drive the turbines and generate electricity in the power house. Some advantages are low costs and emissions while disadvantages include high initial costs and dependence on water availability.