# recession curve

## recession curve

[ri′sesh·ən ‚kərv]
(hydrology)
A hydrograph showing the decrease of the runoff rate after rainfall or the melting of snow.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Once we separate out the baseflow time series, we connect each individual baseflow recession to the master recession curve according to the low streamflows in the tails of the recessions.
As an alternative to modelling the recession curve mathematically, one can derive other parameters such as the exact cap diameter for a particular seasonal date, or the maximum recession velocity, enabling comparisons over successive years.
In addition, by partitioning the stream discharge into the runoff and groundwater baseflow components, one can estimate the portion of the precipitation that recharges the groundwater and the portion that becomes direct runoff The application variations of the two classical groundwater recharge calculation methods based on the stream discharge, i.e., seasonal recession and recession curve displacement, are discussed for this purpose.
KEY WORDS: Precipitation, groundwater recharge, runoff, evapotranspiration, seasonal recession method, and recession curve displacement method.
Two popular, inexpensive and independent methods, which use the stream flow partition techniques, are the seasonal recession method by Meyboom (1961) and the recession curve displacement method by Rorabaugh (1964).
Based on the method of similar triangles, from the semilogarithmic hydrography recession curve (Figure 3), one could derive the discharge Q at any time of t during the recession by:
Recession Curve Displacement Method (RCDM) (or Rorabaugh Method)
The Recession Curve Displacement method by Rorabaugh (1964) identifies multiple recharge events in a recharge season or a 12-month cycle.
(10,11,12) With the recession curve it is possible to compute the ice thickness between the cap edge and the pole (for a simple procedure see Geneslay's article).
Several recession curves (R-Ls), determined from visual telescopic observations made over a period of 140 years, between 1862 and 2010, are examined here.
Equation [5] can therefore be used as an analytical function for the interpolation of points in recession curves. A similar formula was obtained by De Mottoni, who used a simpler exponential function of Ls.

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