USGS Groundwater Information
Groundwater Resources Program
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USGS Groundwater WatchUSGS maintains a network of active wells to provide basic statistics about groundwater levels. ![]() Other Water TopicsUSGS in Your StateUSGS Water Science Centers are located in each state. ![]() |
Recession-Curve Displacement Method for Estimating Groundwater Recharge In Humid RegionsManual Determination of KThe recession index can be determined by manual compilation of a master recession curve composed of numerous recession segments during periods when groundwater was the dominant component of flow for each streamflow-gaging station. An example of manual construction of a master recession curve is shown in the figure from Bevans (1986). The extrapolated base-flow recession on the semi-log plot defines a straight line that declines one log cycle in 32 days. Thus, recession index is 32 days for this watershed.
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