The interaction between the unsaturated zone, aquifer, and stream during a period of groundwater withdrawal

► Specific yield estimates from analyses of core drainage and pumping tests coincide. ► Water release can be reproduced by Moench/Boulton type model. ► Pumping test estimate of specific yield depends on water release assumption. ► Assuming instantaneous drainage leads to biased specific yield estimate. ► Only prediction of early stream depletion depends on water release assumption.