Located in: Special Collections & University Archives

This collection documents the work of Sidney T. Harding (1883-1969), civil engineer, consultant, member of the faculty of the University of California from 1914 until his retirement in 1949, and author of the influential books, Operation and Maintenance of Irrigation Systems (1917) and Water Rights for Irrigation (1935). His research, reports, and project work shaped water resource development in California and the American West in the 20th century.

The collection contains correspondence; technical reports, memoranda, maps, and other materials documenting various aspects of irrigation, including reports and surveys of specific irrigation projects in California, Colorado, Idaho, Montana, Nevada, and North Dakota; and other material relating to water costs and requirements, water rights, groundwater and surface water supply, flood control, legislation, dendroclimatology, enclosed lakes, the Central Valley Project, and Feather River Project in California.