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Hracholusky dam, situated on the River Mže, its area is 490 hectares and the largest dam in Pilsen Tachovsko. Valley of the reservoir is relatively narrow, the banks usually steep, often rocky backwater length 22.5 km and volume of 56.65 million m3. First observe claystone outcrops of Carboniferous age. These lead to the same old sedimentary rocks sandstone and arkoses. Further downstream increasing older Proterozoic rocks mainly fylitických metamorphic greywackes and shales. On the left bank acts as a bridge Pňovanským spilite rocky hillside, which are the basis sericitické chlorite-phyllites of the Upper Proterozoic. Right in the village are again Hracholusky outcrops neoproterozoických chlorite-phyllites and sericitické metadrob. The outcrops can track multiple changing centimeters to meters original positions siltstone, shale and greywacke. These supplements pronounced foliation, sometimes gentle folding and secretion of numerous quartz. Metamorphic foliation close to the bedding has severopvýchodní and southwestern direction and inclination of about 70–80 ° to the southeast. Above the wall is the position of the freshwater Tertiary relicts, which are represented by gravels and sands with clay liners.

Dam is sprinkled with the use of local stone and with moderate a clay seal. The dam is 26.5 meters high and 270 meters long. The dam was completed in 1964 on the grounds that the past no longer eat enough to retain enough water for consumption in the lower reaches Mže. When the building was flooded several villages, including a bridge connecting Butov and Vranov, which stood in these places. Its purpose was mainly accumulation of water for industry (Škoda), irrigation and heating plant. Another purpose is to lessen the impact of flooding, energy use, fishing, ensuring minimal residual runoff and recreation. The tank area is the amount of cottages and various recreational facilities and camp sites. On the surface run shipping.

GPS position

N 49° 45.932', E 13° 3.571'