Abstract
ABSTRACT The matching curve and ratio methods may be of considerable use for solving hydrological equations that have a decay type relationship with time or another parameter. The two techniques are illustrated by application to several base-flow equations. The matching curve method requires a set of type curves and a plot of field or other data on similar but transparent paper. Matching is done by horizontal and vertical adjustment, and constants are calculated from match point values. All that is required for the ratio method is a set of ratios curves and the calculation of ratio from field or other data. No plotting of data or matching is required, and all constants are obtained or calculated from the set of ratio curves. Both methods are simple and rapid to use, but the ratio method gives better results. The matching curve method, however, is better for the direct visual comparison of data. Either method allows one to make some inferences about the nature of the recession curve.
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