Toward coupling of groundwater drawdown and pumping time in a constant discharge

Abstract Groundwater is considered an essential water resource in arid and semi-arid regions such as Iran. This study used a copula-based approach to analyze the joint frequency of groundwater level duration pumping with constant discharge. In particular, this examines correlation between time drawdown variables for two cases 26.6 28.8 l/s discharges 220 min. addition, Weibull probability distribution Galambos copula were these tests. To estimate at different times probabilities, obtained typical curves by providing contour cumulative both tests obtained. For example, 150 min pumping, discharge 26.64 60% about 7.4 8 m, respectively. The results joint-occurrence analysis area showed that each unit increase well, 0.32 m imaginable observation well. next step, got analyzed simultaneously. Since same, effect increasing observable curve.