Drilling Technology and Borewell Construction
Constructing an agricultural borewell requires geological hydro-surveying followed by specialized pneumatic or rotary drilling.
A typical borewell has a casing diameter of 6 to 8 inches (150 to 200 mm) and penetrates to depths of 100 to 500+ feet depending on local water tables.
- DTH (Down-the-Hole) Hammer Drilling: Used in hard rock peninsular basalt and granite formations using high-pressure pneumatic compressors
- Rotary Mud Drilling: Deployed in loose alluvial river sediment and sand formations using bentonite mud circulation to prevent borehole collapse
- Casing Pipes (UPVC / Mild Steel): Heavy-gauge casing installed through upper loose soil layers down to bedrock to prevent borehole caving and surface water contamination
- Slotted Screen Pipes: Perforated screen sections placed opposite water-bearing aquifer fractures allowing groundwater ingress while filtering sediment
Pump Selection: Submersible vs Solar Pumping Systems
Selecting the appropriate pump depends on total dynamic head (pumping depth plus elevation lift) and discharge volume required for irrigation.
Submersible pumps installed deep underwater provide continuous, energy-efficient water delivery for drip, sprinkler, or flood systems.
- Multi-Stage Submersible Pumps: Stainless steel water-filled motors (3 HP to 10+ HP) installed 20 to 50 feet below active draw-down water levels
- Solar Pumping Integration (PM-KUSUM): Solar photovoltaic panels driving DC or AC solar submersible pumps, eliminating grid power and diesel dependence
- Control Panels: Incorporate digital starters with dry-run protection, overload relays, and phase-failure safeguards to protect pump motors
Groundwater Stewardship and Artificial Recharge
Over-extraction of groundwater has caused regional water table decline across many agricultural districts.
Constructing borewell groundwater recharge pits around casing heads channels clean monsoon runoff into aquifers, sustaining long-term well yields.
- Borewell Recharge Pits: Excavating 10x10 foot filter pits around casings packed with boulders, gravel, and sand to filter surface runoff into fractures
- Water Testing: Regularly test borewell water for electrical conductivity (EC), salinity, and sodium adsorption ratio (SAR) before irrigating sensitive crops
- Yield Testing: Perform compressor yield tests post-drilling to calculate sustainable liters-per-hour output before sizing pump horsepower
Official source
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Central Ground Water Board - Ministry of Jal Shakti ↗Related on KisanPe
Common questions
What is the difference between a borewell and an open well?
An open well is a wide, shallow dug well (10 to 30 feet wide and 30 to 60 feet deep), while a borewell is a narrow, machine-drilled deep hole (6 inches wide and 100 to 500+ feet deep) tapping deep confined aquifers.
What horsepower pump is needed for a 250-foot deep borewell?
A 5 HP to 7.5 HP multi-stage submersible pump is typically recommended for depths of 200 to 300 feet depending on required water discharge volume.
What is dry-run protection on a borewell submersible pump?
Dry-run protection is an automated sensor in the control panel that shuts down the motor if water levels drop below the pump intake, preventing motor burnout.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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