Recovery test interpretation under non-ideal conditions
a cargo de: Michela Trabucchi
Día: Jueves 23 de Marzo a las 12.15h
Lugar: Departamento de Ing. Terreno, Aula Cihs, Planta Baja
Pumping tests are usually performed during aquifer characterization to gain hydraulic information about the system and to, ultimately, estimate hydraulic properties such transmissivity and storage coefficient. Among the methods employed, the recovery test measures the water level response in surrounding observation wells after the termination of pumping. Parameter estimates obtained from the interpretation of the water head response depend on the range and quality of available drawdown and pumping rate data (data acquisition) as well as on the approach used for the interpretation (analysis techniques). In this work, we analyse the limitations of Agarwal’s method for interpreting the recovery test under non-ideal conditions and we finally propose a new approach to overcome its limitations.
In this context, we first examine whether Agarwal’s method is valid under non-ideal conditions: constant-head, a leaky aquifer, the presence of an impermeable barrier or a time-dependent pumping rate. Our results show that, once the Jacob’s hypothesis is achieved, Agarwal’s method provides adequate parameter estimates for nearly all system conditions except for a time-dependent pumping rate. In this situation, a new equivalent time should be used instead to better represent the true pumping history utilized during the pumping test.