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Chapter:
How Aquifer are formed? Explain difference between confined and unconfined aquifer.
Aquifers are created when water seeps through the earth and permeable rock until reaching a layer of impermeable rock. Groundwater then saturates the surrounding rock or sand, forming an aquifer. The region supplying water to the confined aquifer is known as recharge area.
A confined aquifer forms when water collects, by pressure or gravity, between two layers of impermeable rock. Fissures in solid rock also allow water to pool.
Unconfined aquifer | Confined aquifer |
In this of aquifers the water table is formed in the upper surface of zone of saturation. So it is called as water table aquifer. | In this type of aquifer the ground water is confined under pressure by the over lying strata than the atmospheric pressure. So it is known as pressure aquifer. |
It occurs near the ground surface. | I.... |