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In page Hydrograph:

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*Rising limb: The rising limb of the hydrograph, also known as concentration curve, reflects a prolonged increase in discharge from a catchment area, typically in response to a rainfall event.

  • Peak discharge: the highest point on the hydrograph when the rate of discharge is greatest.
  • Recession (or falling) limb: The recession limb extends from the peak flow rate onward. The end of stormflow (a.k.a. quickflow or direct runoff) and the return to groundwater-derived flow (base flow) is often taken as the point of inflection of the recession limb. The recession limb represents the withdrawal of water from the storage built up in the basin during the earlier phases of the hydrograph.
  • Lag time: the time interval from the maximum rainfall to the peak discharge.