As its title suggests, this dictionary deals with water: water in relation to engineering projects designed to utilize it, to control it, or to defend us against it; water as a basic element of our environment, and water as the subject of a variety of physical phenomena. The dictionary comprises a basic table with 5117 terms in English. Equivalents are given in French, Spanish, Dutch and German, keyed to the basic table by number. The aim of the dictionary is to promote better understanding and communication between people of different nationalities working in the field of hydraulics, water management and hydraulic engineering. Accordingly, the coverage is both comprehensive and wide, encompassing the following: water - physical properties and phenomena, hydraulics, hydrodynamics, hydrostatics, waves, tides, hydrology, fluvial hydraulics, groundwater flow, geomorphology, sediment transport and selected terms on hydrography and limnology; hydraulic engineering - aspects of design, construction, operation and maintenance, river engineering, dams, reservoirs, coastal engineering, marine technology, flood control, dikes, barriers, waterways, locks, weirs, canals, hydraulic aspects of tunnels and bridges, harbours, breakwaters and navigation facilities, dredging and bed protection, pumps, turbines, water power, circuits, pipelines and appurtenances; water management - water supply, irrigation and agricultural engineering, water quality, waste-water, cooling-water, drainage and groundwater works; experimental aspects - scale modelling and testing methods, measuring methods, instruments and hydrometry. This work should be of interest to engineering consultants, dredging firms, water authorities, harbour authorities, contracting firms, public works departments, civil and hydraulic engineers, university and research institute libraries, as well as to translators, interpreters and those working with the technical literature.