1. Wrong Weight Assignment in Multi-Criteria Analysis (MCA)
One of the most frequent mistakes is assigning equal or arbitrary weights to thematic layers like slope, land use, geology, and drainage. This leads to misleading outputs that don’t reflect actual groundwater recharge conditions.
2. Incomplete or Low-Resolution Thematic Layers
Users often download freely available datasets without checking spatial resolution, accuracy, or projection, leading to low-quality layers that distort results when overlaid or analyzed together.
3. Missing Buffer Analysis for Line Features
Drainage or fault lines must be buffered properly before integration into weighted overlay analysis. Many users skip this step or apply incorrect buffer distances, impacting the accuracy of groundwater recharge potential interpretation.
4. Improper Reclassification of Raster Layers
When converting vector inputs into raster for overlay analysis, incorrect reclassification ranges or classes can render the map invalid. This is often due to misunderstanding the scale or influence of individual parameters.
5. No Ground Truth or Field Validation
Relying solely on GIS without any field verification or comparison with existing groundwater well data may result in maps that look good visually but are scientifically weak or unverifiable.
🛑 Don't Waste Time on Faulty Groundwater Maps
These problems are common for those trying to follow online guides or piecing together random tutorials. What you need is a guided full-project approach—from data collection to final groundwater zone output.
🎓 Follow a Step-by-Step Workflow Designed for Real-World Projects
This comprehensive course helps you build a complete groundwater potential mapping project in ArcGIS, using scientifically valid techniques:
👉 Groundwater Potential Zones GIS - Complete Project ArcGIS
What you’ll learn:
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Selection and preparation of accurate thematic layers
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Weight assignment using Analytical Hierarchy Process (AHP)
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Reclassification, overlay, and final groundwater mapping
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Project structuring, validation, and map layout
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ArcGIS-based full workflow with no extra software
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