This is the only introductry guide to field practice which gives complete, practical information on how hydrological and geological information essential to water resource development is obtained and assembled. Stressing day-to-day problems of the hydrogeologist during field investigation, it describes the basic apparatus for taking appropriate measurements and how to find and make the most of previous records and surveys. The geological assessment of aquifers and underground water systems and appropriate survey methods are explained as well as procedures for solving particular problems. A final chapter discusses good working practices. The book is fully illustrated.