Drilling at unconsolidated layer can make the aquifer disturbed and reduce a productivity of groundwater well. Surge block and air surging were applied to a pumping well located in Jeungsan-ri, Changnyung-gun, to improve a well efficiency by removing clogging and fine-grained slime. Two experimental log-linear equations,
y1=−0.1769ln(x1)+0.4960 and
y2=−84.3358ln(x2)+512.8162, were proposed in this site, in which
x1 and
x2 are the number of surging event,
y1 is the amount of slime, and
y2 is a recovery time of groundwater level after air surging. Well loss exponent (P) decreased after surging, from 3.422 to 1.439, and the groundwater inflow from aquifer happened in all directions around a well with gradually increasing the homogeneity in a local aquifer's hydraulic property. It was revealed that long-term well development should be done in the pumping well which is located in unconsolidated sediments to increase a well productivity.
Keywords: Well development;Well efficiency;Clogging;Slime;Unconsolidated layer;