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Hydrograph
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==Terminology== Other related terms include:<ref>{{Cite web |title=Unit Hydrograph Theory: Terminology and Assumptions |url=https://download.comet.ucar.edu/memory-stick/hydro/basic_int/unit_hydrograph/navmenu.php_tab_1_page_6.1.0.htm |access-date=2023-02-28 |website=download.comet.ucar.edu}}</ref> ;Approach Segment: the river flow before the storm (antecedent flow). ;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 ({{aka}} [[quickflow]] or direct runoff) and the return to groundwater-derived flow ([[Baseflow|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-1: autocorrelation method to compare streamflow data to itself by shifting or "lagging" initial discharge dataset 1 time unit. A Lag-10 would mean the initial data is shifted 10 days, then is compared to an unshifted version of the data. Not to be confused with lag time. ;Lag time: the time interval from the maximum rainfall to the peak discharge. ;Time to peak: time interval from the start of rainfall to the peak discharge. ;[[Time of concentration]]: the time from the end of the precipitation period to the end of the quick–response runoff in the hydrograph.<ref>{{Cite web |title=Unit Hydrograph Theory: Unit Hydrograph Theory Terminology |url=https://download.comet.ucar.edu/memory-stick/hydro/basic_int/unit_hydrograph/navmenu.php_tab_1_page_2.2.0.htm |access-date=2023-05-19 |website=download.comet.ucar.edu}}</ref>
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