| Unit hydrograph (UH) |
- The unit hydrograph is the unit pulse response function of a linear hydrologic system.
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- First proposed by Sherman (1932), the unit hydrograph (originally named unit-graph) of a watershed is defined as a direct runoff hydrograph (DRH) resulting from 1 in (usually taken as 1 cm in SI units) of excess rainfall generated uniformly over the drainage area at a constant rate for an effective duration.
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- Sherman originally used the word “unit” to denote a unit of time. But since that time it has often been interpreted as a unit depth of excess rainfall.
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- Sherman classified runoff into surface runoff and groundwater runoff and defined the unit hydrograph for use only with surface runoff.
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