Electrical-hydraulic conductivity model for a weathered-fractured aquifer system of Olbanita, Lower Baringo Basin, Kenya Rift

SOSI Benjamin; BARONGO Justus; GETABU Albert; MAOBE Samson

doi:DOI: 10.19637/j.cnki.2305-7068.2019.04.007

Volume 7 Issue 4

Dec. 2019

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Article Navigation > Journal of Groundwater Science and Engineering > 2019 > 7(4): 360-372

SOSI Benjamin, BARONGO Justus, GETABU Albert, et al. 2019: Electrical-hydraulic conductivity model for a weathered-fractured aquifer system of Olbanita, Lower Baringo Basin, Kenya Rift. Journal of Groundwater Science and Engineering, 7(4): 360-372. doi: DOI: 10.19637/j.cnki.2305-7068.2019.04.007

Citation:

SOSI Benjamin, BARONGO Justus, GETABU Albert, et al. 2019: Electrical-hydraulic conductivity model for a weathered-fractured aquifer system of Olbanita, Lower Baringo Basin, Kenya Rift. Journal of Groundwater Science and Engineering, 7(4): 360-372. doi: DOI: 10.19637/j.cnki.2305-7068.2019.04.007

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Electrical-hydraulic conductivity model for a weathered-fractured aquifer system of Olbanita, Lower Baringo Basin, Kenya Rift

doi: DOI: 10.19637/j.cnki.2305-7068.2019.04.007

1Department of Natural Resources, Egerton University, Kisii 408, Kenya. 2Department of Geology, University of Nairobi, Nairobi 30344, Kenya. 3Department of Natural Resources, Kisii University, Kisii 408, Kenya.

Publish Date: 2019-12-28

Abstract

Abstract

Groundwater yield in the Kenya Rift is highly unsustainable owing to geological variability. In this study, field hydraulic characterization was performed by using geo-electric approaches. The relations between electrical-hydraulic (eh) conductivities were modeled hypothetically and calibrated empirically. Correlations were based on the stoch-astic models and field-scale hydraulic parameters were contingent on pore-level parameters. By considering variation in pore-size distributions over eh conduction interval, the relations were scaled-up for use at aquifer-level. Material-level electrical conductivities were determined by using Vertical Electrical Survey and hydraulic conductivities by analyzing aquifer tests of eight boreholes in the Olbanita aquifer located in Kenya rift. VES datasets were inverted by using the computer code IP2Win. The main result is that ln T=0.537 (ln Fa)+3.695; the positive gradient indicating eh conduction through poresurface networks and a proxy of weathered and clayey materials. An inverse (1/F-K) correlation is observed. Hydraulic parameters determined using such approaches may possibly contri-bute significantly towards sustainable yield management and planning of groundwater resources.
- Electrical and hydraulic conductivity model,
- Weathered-fractured aquifer system,
- Olbanita,
- Kenya rift

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References(40)

References

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