A well 3 meters in diameter has its normal water level 3 meters below the ground level. By pumping water level in the well is depressed to 10 meters below the ground level. In 4 hours the water rises by 5 meters. Calculate the specific yield of the well.

Ground Water for Irrigation through Wells and Tubewells topics include: infiltration, ground water controlling factors, aquifers and their type, open well, dug well and tube well. A tube well is a type of water well that uses a long, narrow stainless steel pipe bored underground. The lower end of the tube has a strainer, and a pump lifts water for irrigation.  Tube wells are a reliable source of water for irrigation. They are the cheapest and easiest method of irrigation and an affordable alternative for small farmers.  Tube wells have several advantages, including: Groundwater... Show more

Ground Water for Irrigation through Wells and Tubewells topics include: infiltration, ground water controlling factors, aquifers and their type, open well, dug well and tube well.

A tube well is a type of water well that uses a long, narrow stainless steel pipe bored underground. The lower end of the tube has a strainer, and a pump lifts water for irrigation. 

Tube wells are a reliable source of water for irrigation. They are the cheapest and easiest method of irrigation and an affordable alternative for small farmers. 
Tube wells have several advantages, including:
Groundwater availability: Makes groundwater available when the water table is close to the surface
Irrigation: Can irrigate a large area
Drought reliability: More reliable than surface water during droughts 

Tube wells can irrigate 2 hectares per day against 0.2 hectares per day irrigated by an ordinary well. 
The main factors are:
There should be sufficient quantity of ground water
The water level should be nearly 15 meters 

One disadvantage of using tube well systems for irrigation purposes is that it leads to depletion of the groundwater. 

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