The increase in prices of fossil energy sources and their impact on the environment due to green gas emissions has made hydropower more and more an important and attractive energy source. Opposite to the disadvantages given by the implementation of big hydroplants, the proper design of small hydro powerplants can be an environmental friendly solution and represents a useful alternative renewable energy source, especially for rural areas without developed electricity grids. Thus, small hydropower is specially featured for implementation in countries in transition and emerging countries.