There are very few books that have focused on the issues relating specifically to small-scale hydropower; the most useful sources of information are listed below.
Readers looking for the hydraulic theory of turbines should examine traditional hydraulics engineering textbooks; although these are usually written with large-scale projects in mind, the basic theory for a small turbine is no different to that of a large turbine.
1. Micro-Hydro Design Manual, A.Harvey et al., IT Publications Ltd, London 1993.
A comprehensive technical guide to small-scale hydropower projects, focusing mainly on projects <500kW. It covers the whole topic from initial site survey, through to equipment selection and installation.
2. Micro-Hydro Power: a guide for development workers, P.Fraenkel, O.Paish, V.Bokalders, A.Harvey, A.Brown, R.Edwards, IT Publications Ltd, London 1991 (reprinted 2001).
A shorter manual covering all the important topics but without going into in-depth technicalities.
3. Layman’s guidebook on how to develop a small hydro site. Published by the European Commission, 200 Rue de la Loi, B-1049 Brussels, Belgium, 1994 (out of print but available by download from www.esha.be).
This two-volume manual describes the principal steps to be taken in the development of a small hydro site in Europe.
4. Hydropower – A handbook for Agency Staff. Environment Agency, May 2003
5. A UK Guide to Intake Fish Screening Legislation, Policy and Best Practice, Fawley Aquatic, Crown Copyright, Department of Trade and Industry, 1998.
6. The Micro-hydro Pelton Turbine Manual. J Thake, ITDG Publishing, 2000.. | 
