Hydrologists apply scientific knowledge and mathematical principles to solve water-related problems of quantity, quality, and availability. The work of hydrologists is as varied as the uses of water, and may range from planning multi-million dollar interstate water projects to advising homeowners about backyard drainage problems. They may be concerned with finding water supplies for cities or irrigated farms, or controlling river flooding or soil erosion. Scientists and engineers in hydrology may be involved in both field investigations and office work. In the field, they may collect basic data, oversee testing of water quality, direct field crews, and work with equipment.
Many jobs require travel, some abroad.
A hydrologist may spend considerable time doing fieldwork in remote and rugged terrain. In the office, hydrologists do many things, such as interpreting data and performing analyses for determining possible water supplies. Much of their work relies on computers for organizing, summarizing, and analyzing masses of data, and for modeling studies, such as the prediction of flooding and the consequences of reservoir releases or the effect of leaking underground oil storage tanks .