A city worker is trying to dig to reach the water table. She knows the unsaturated zone in the area is four feet thick and the saturated zone is another five feet thick before an impermeable granite layer is reached. How deep will she have to dig to reach the water table?
Answers
Answer:
the correct answer is five feet.
the unsaturated zone refers to the top layer of permeable substance, it is the layer that is not generally occupied with water, except after a rainfall. on the other hand, the saturated zone refers to the depth the water reaches where the pores in the ground get saturated with water, and the region that holds water can reach deep into the earth.
the water table refers to the top of the saturated zone, by getting familiar with the depth of the water table in a region one can find the depth one needs to dig to reach the groundwater.
in the given case, unsaturated zone is four feet thick, and the saturated zone is another five feet in thickness, and it is known that the water table is found at the top of the saturated zone. so, the city worker would need to dig 5 feet to reach the water table.
Answer:
The ground water has two zones, namely unsaturated and saturated water zones. The unsaturated zone contains both air and water among the soil particles and rocks. The surface layer of saturated zone is known as the water table, which contains only water, even in the pores and crevices of the rocks. So this worker needs to dig only four feet in the ground to reach the water table.