ALL YOU WANT TO KNOW ABOUT BORE WELL
What is the standard diameter of borewells drilled for domestic purposes?
A bore well is a well of 4 ½”, to 12” in diameter drilled into the earth for retrieving water.
In this 4 ½” and 5 ½” Borewells are commonly for Domestic purposes
while 6 ½” and more are for Commercial / Industrial purposes.
The depth of a bore well can vary from
150 feet to 1500 feet.
Cost of borewell drilling depends on
1. Cost per feet
2. Cost of the casing pipe per feet
3. Cost of Installation of casing pipe and drilling per feet
4. Transportation charges of the rig
5. Flushing the borewell per hour
LCETED TRIVIA
How do I find the underground water to dig a bore-well?
Techniques adopted
1. Vertical electrical sounding
2. Low-frequency sounding
3. Induced polarization survey
4. electromagnetic survey
5. Proton precision magnetometer analysis
6. geographical information system
7. Ground-penetrating Radar analysis
8. Seismic hammering method
9. magnetometer survey
10. proton magnetic survey
The above listed are some of the techniques which produce results but the scope of study completely depends on the Geologist who performs the survey
Which types of pumps are suitable for borewells?
Jet, compressor and submersible pumps are the widely used pumps for domestic purposes in India.
Jet pumps which are installed above the ground level over or near the borewell is suitable for depths up to 150 feet.
If the groundwater is at lower depths submersible or compressor pumps are used.
Submersible Or Compressor Pumps
Compressor pumps are suitable for low-performance borewells and are easy to install and maintain as they are installed at ground level. However, they are noisy and may require frequent repairs.
Submersible pumps 4 "diameter submersible pumps that can run on a single-phase electrical connection are available on the market now, they have become a preferred choice for domestic drilling wells. They can be installed to meet increased water requirements. However Submersible pumps will be prone to frequent repairs if installed in drill holes containing heavy silt particles.
Most commonly used types of drilling methods are
Water Jetting - Shallow bores in alluvial formations
Augur Drilling - Shallow bores in alluvial formations
Calyx Drilling - Shallow bore wells in both hard rock and alluvial formation
Percussion Drilling – Deep bores in bouldery formation
Rotary Drilling - The most common method used for drilling large and deep bores in alluvial formations.
Down the Hole Hammering (DTH) Drilling – a Most common method for drilling large and deep bore wells in hard rock formations.
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