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instantaneous unit hydrograph

Hydrograph — There are two meanings for hydrographs both coming from hydro meaning water, and graph meaning chart. A hydrograph plots the discharge of a river as a function of time. This activity can be in response to episodal event such as a… … Wikipedia
Runoff model (reservoir) — A runoff model is a mathematical model describing the rainfall runoff relations of a rainfall catchment area or watershed. More precisely, it produces the surface runoff hydrograph as a response to a rainfall hydrograph as input. In other words,… … Wikipedia