Glossary of Hydrologic Terms - U
Glossary of Hydrologic Terms - U
These definitions have been compiled from various sources, including the USGS's Water Resources Data, Weather Service Operations Manual, Chapter E-90, and Glossary of Meteorology (AMS, 1959).
- unit hydrograph
- The hydrograph of one inch of direct (surface plus interflow) runoff resulting from rainfall uniformly distributed over the drainage basin and of uniform intensity throughout a specified period of time.
- unit hydrograph theory
- Surface runoff hydrographs for storm events of the same duration will have the same shape, and the ordinates of the hydrograph will proportional to the ordinates of the unit hydrograph. For example, the discharge from one-half inch of runoff will be half of that from the unit hydrograph.
- urban flooding
- The inundation of streets, basements, ground level floors of buildings, et cetera in urban areas.
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