Abstract
There are two types of groundwater in the Nakdong River Basin. One is the shallow groundwater and another is the deep groundwater. The shallow groundwater occurs in the alluvial deposits or in the bed rocks decomposed by weathering. On an average, the thickness of the geological strata bearing shallow groundwater is 5.6 meters. The shallow groundwater exists as free surface water in geological strata. The total of the shallow groundwater that drains into the sea is as small as 1, 300m3/year, the total storage is 7, 600 × 106m3, and the yield is 0.009 × 106m3/day/km2. The deep groundwater occurs as fissure water or stratum water in igneous and metamorphic rocks or in consolidated sedimentary rocks. The total storage of deep groundwater is 17, 700 × 106m3, the yield is 130m3/day/km2 in igneous and metamorphic rocks, 50m3/day/km2 in volcanic and dike rocks, and 1, 800m3/day/km2 in consolidated sedimentary rocks
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