Abstract
Study about potency of underground river is indispensable as an effort to resolve the problem of drought in the karst area of Ngargoharjo Wonogiri. This study aimed to identify the pattern flow of underground river in the Village Ngargoharjo based subsurface structures. The method used is very low frequency (VLF) method with tilt angle mode which measurement has five tracks, each track is 700 meters and consists of 37 measurement points. Based on the results obtained ekivalen current density values in the range of 10% to 35% which are interpreted as a conductive anomaly in the form of an underground river. Underground river in the village of Ngargoharjo have a flow pattern that starts from the spring in the Gedangan flowing to the Southwest toward Pakel Kopek Sinkhole. Underground river over there is a upstream of the river, so the water debit is small.
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