A confined aquifer is an aquifer that has confining unit (low conductivity, Aquitard) as an upper bound and lower bound. Unconfined aquifers interact with surface water systems (i.e., groundwater surface water interactions)
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Confined vs. Unconfined Storage 17 Unconfined Aquifer Confined Aquifer S = (Sy+ b∙Ss)S = b∙Ss Storativity
Storage in Unconfined Aquifers •in unconfined aquifers, when the head declines so does the water table. Water is released by fluid expansion and matrix compression (as in the saturated case), but the pores themselves also drain. This drainage gives rise to a concept known as specific yield (Sy). 18 Unit Decline in Water Table Unconfined Aquifer Before After