Abstract

This study analyzed four mathematical models for recessive flow estimation in order to determine which one would provide the best results for an Andean basin in Maule, central Chile. This was accomplished through the analysis of 25 summer floods occurring between 1971 and 2003, which identified groundwater as the exclusive supply as of the third inflection point of the falling limb of the storm's hydrograph. The results indicate that the exponential model 3 provides the best estimates. According to the Bland and Altman agreement test, the best model adjustment period was 240 hours.