Before you start searching for books, articles or web pages, you need to choose keywords that represent your research topic.
Keywords are significant words (usually nouns or noun phrases) which can be used as search terms in indexes, online catalogs, or databases. They can appear in the title, subject headings, abstract, or text of records. A keyword search typically searches all or most of these fields.
BROAD: Water, Hydrology, Aquatic
NARROW: Aquifers; groundwater; irrigation; hydropower; water pollution; "water table; " freshwater; "water rights;" "water supply systems;" drought; "streams and rivers;" dams; aqueducts; "water resources development;"
National Agricultural Library Thesaurus & Glossary : Hydrology terms
Examples of LIBRARY OF CONGRESS SUBJECT HEADINGS :