The objective of this research is to enhance our conceptual understanding of MSR, and quantify temporal and spatial variability of MSR in selected semi-arid catchments in the Basin and Range of Arizona. Water budget analysis was performed on a seasonal time scale using the Soil and Water Assessment Tool (SWAT2005) and the coupled soil moisture-Hillslope Storage Boussinesq model. Isotopic and soil moisture data were used to provide a constraint on recharge seasonality and water balance partitioning. Preliminary results show annual variability of MSR with pronounced differences in winter and summer seasons. Moreover, a threshold response of MSR to winter and summer precipitation and soil moisture was shown over the simulation period in different catchments. Quantifying these thresholds is important in evaluating impact of climate variability on MSR.
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