Groundwater occurs in the layered rocks that are saturated with water. The most important properties of the stones that will hold water until it is saturated, i.e. a gap occurring in rocks. There are many gaps in rock-like gap between the accumulated sludge pellet gun in case gravel or sand. The gap between the joints as well as layers of stone. The gap arising from the cracks of the rocks. A gap occurs naturally At the same time, with the occurrence of certain types of rocks such as volcanic rocks and limestone niche category space, etc. The rocks will have plenty of good water storage will need to have the same number of spaces. Space each channel must have a large and connected so that the groundwater flow dump. There is a large gap in the rocks, but not connected. Although a lot of the water storage would not be useful as a source of groundwater, because consequence of water drainage basin is incarceration, not water flow in the dry season. The water in the basin is used to temporarily for a period of time, it will go out. Not like water in a stream that has water flowing all year round with a chance to pump or scoop to use at any time.
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