Borewell Site Selection: A Complete Guide

Updated July 2026 · ~7 min read

The difference between a strong borewell and a dry hole is often just a few dozen metres. Choosing the right point is a process of stacking evidence. Here is the framework professionals use.

1. Start with the geology

The rock type decides how water is stored and how much you can expect:

• Alluvium (sand/gravel): high storage, often shallow — the easiest, most reliable target.
• Weathered / fractured hard rock: water lives in fractures; the goal is to intersect them.
• Massive unweathered rock: poor prospects unless a major fracture zone runs through.

2. Follow the terrain and drainage

Water moves downhill and collects. Favour valley floors, foot-slopes and the convergence of drainage lines. Avoid ridge tops and steep upper slopes where recharge runs off. Satellite elevation models make these patterns obvious even on flat-looking land.

3. Read the vegetation

Persistent green cover, certain deep-rooted tree species and dark, moist soil patches in dry seasons hint at shallow water. NDVI/NDWI satellite indices quantify this across a whole plot at once.

4. Use nearby wells as ground truth

The depth, yield and seasonal behaviour of existing wells within a few hundred metres are the strongest local evidence you have. Ask neighbours; note failures too.

5. Respect setbacks and safety

• Keep a safe distance (typically 10 m+) from building foundations.
• Stay at least ~15 m from septic tanks, drains and surface water bodies to protect quality.
• Check local regulations and permits before drilling.

6. Stack the evidence with AI

Instead of judging each factor by eye, an app like JalDrishti combines satellite imagery, terrain, drainage and geology into a single probability score and suggests the optimum drill point and survey direction — free, for any location worldwide.

Site-selection checklist

1. Identify the geology (alluvial vs hard rock).
2. Locate low points and drainage convergence.
3. Map persistent vegetation and moisture.
4. Collect nearby well depths and yields.
5. Run an AI scan to rank candidate points.
6. Confirm the top point with a geophysical survey before drilling.