A hydrogeological survey in Kenya typically takes 3 to 10 working days for standard borehole projects, depending on site accessibility, terrain complexity, and survey scope. Urban sites like Nairobi often complete within 3-7 days, while remote ASAL regions extend to 1-2 weeks.
Timeline Breakdown by Phase
Day 1: Desk Study – Review geological maps, WRA borehole records, satellite imagery, and rainfall data (1 day). No fieldwork needed.
Days 1-2: Field Reconnaissance – Site visit for GPS mapping, soil test pits, vegetation assessment, local interviews (1-2 days).
Days 2-4: Geophysical Testing – Vertical Electrical Sounding (VES) at 4-8 points using electrode arrays. Each line takes 1-2 hours; clay or rainy conditions slow deployment.
Days 4-6: Data Processing – Software analysis (RES2DINV/IPI2win) generates 2D resistivity profiles, aquifer models (2-3 days).
Days 6-7/10: Reporting – Compile WRA-compliant document with coordinates, depth estimates, yield projections. Revisions add 1-2 days.
Total: 5-7 days average for accessible 1-5 acre sites; 10 days max for comprehensive surveys.
Factors Affecting Duration
Remote sites add 2-4 days travel; complex geology (volcanics) requires extra modeling.
Accelerated vs. Extended Surveys
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Fast-Track (3-5 days): Basic VES for domestic boreholes (KES 40k-60k).
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Standard (5-7 days): Multi-point for farms/industry (KES 60k-90k).
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Detailed (10-14 days): Remote + water quality (KES 100k+).
WRA permit processing adds 7-14 days post-report, but fieldwork wraps quickly with pros like Raeli Hydro.
Surveys justify the wait—90% drilling success versus 50% blind—delivering yields in days, not weeks of trial-and-error.