From the results of geological mapping and excavation of wells uju TP-1, earned that kind of land here is clay lanauan, reddish brown, the consistency of firm until very stiff, high-plasticity, the graduation of low water. The thickness of this layer of clay ranges between 0.5 meters to 9 meters. The average thickness is estimated to be 5 meters.
Broad dissemination of the lanauan clays on the surface is about 4 Ha. From the above data can calculate the approximate amount of material reserve land can be taken from this location is 200,000 m3. From the results of laboratory test of mechanical characteristics of the ground gained tanah1 in this location meets the technical feasibility for use as core material Dam Sadawarna.