Ground water as an important source of water
- Near water bodies the soil is moist under the ground because of the presence of ground water.
- A layer at which the space between particles of soil and gaps between rocks are filled with water, the upper limit of this layer is called water table.
Fig. Water table
- Ground water is the water found below water table.
Fig. Ground water
- Water table may be at a depth of less than several meters below the ground.
- The process of seeping of rain water and water from other sources into the ground to form ground water is called infiltration.
- Rain water and water from rivers, ponds seep through the soil and fill the gaps between particles of soil and rocks.
- Below the water table, ground water stored between layers of rocks is called as aquifer.
- Hand pumps and tube wells are used to pump out aquifer water.
Fig. Hand pump