Water Supply and Irrigation Papers of the United States Geological Survey . A. SINK-HOLE CONNECTION WITH UNDERGROUND DRAINAGE /; UNDERGROUND CHANNEL. fuller] STORAGE OF GROUND WATER. 21 Absorption takes place both directly and indirectly. In the case ofdirect absorption the rain falls upon the surface of the rock and thewater is absorbed either by its pores or by the fissures or cavitieswhich it may contain. In indirect absorption the water is first directlyabsorbed into loose unconsolidated deposits overlying the solid rocks,or is gathered into streams flowing over their surfaces. In
Water Supply and Irrigation Papers of the United States Geological Survey . A. SINK-HOLE CONNECTION WITH UNDERGROUND DRAINAGE /; UNDERGROUND CHANNEL. fuller] STORAGE OF GROUND WATER. 21 Absorption takes place both directly and indirectly. In the case ofdirect absorption the rain falls upon the surface of the rock and thewater is absorbed either by its pores or by the fissures or cavitieswhich it may contain. In indirect absorption the water is first directlyabsorbed into loose unconsolidated deposits overlying the solid rocks,or is gathered into streams flowing over their surfaces. In thosecases where the rocks are directly exposed to the rainfall the waterwhich is not immediately absorbed runs off and either enters loosematerials or is gathered into the streams as indicated. The unconsoli-dated materials soon become saturated to a certain level, and the rocksupon which they lie are in this way kept constantly in contact withthe water, which is continually absorbed. In the case of the water entering the sands and gravels the direc-tion of the movement is generally toward the river rather than awayfrom it, bu
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