Abstract
In the various geological formations of the research region, 57 samples from saturated sandstone strata were studied. The study’s findings revealed that the Kozeny–Carman equation offered estimates of hydraulic conductivity that ranged between 2.682 and 1356.28 m/day with an average of 256.04 m/day, whereas the Hazen model gave estimates that ranged from 0.08443 to 4.10745 m/day with an average of 1.552 m/day. Additionally, calculations using the Brayer empirical equation showed that hydraulic conductivity values ranged from 0.0247 to 2.388 m/day with an average of 0.576 m/day, but the Slitcher’s equations produced values that ranged from 0.129 to 14.999 m/day with an average of 2.82 m/day. Hydraulic conductivity readings from the USBR equation ranged from 0.00111 to 0.14287 m/day, with an average of 0.46 m/day. The improved ANN model produced hydraulic conductivity values that vary from 1.2764 to 6.9989 m/day with an average of 4.23158 m/day, contrary to the results of the prediction from the MLR approach, which showed values that ranged between 1.8631 and 6.9394 m/day with an average of 4.9655 m/day. It is clear that the MLR, ANN, and Slitcher models, in that sequence, may be used to predict hydraulic conductivity across the entire area because the estimates from the Slitcher, ANN, and MLR models are very similar to the pumping test data with RMSE of 5.140, 2.5754, and 1.0045, respectively.
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Acknowledgements
The Management of Tertiary Education Trust Fund (TETFUND), which sponsored this study at 100% through the 2020 National Research Fund grant cycle, is acknowledged by the authors for its support. We are grateful for the management and staff at the Anambra-Imo River Basin Development Authority in Owerri's technical and data help.
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Emberga, T.T., Opara, A.I., Onyekuru, S.O. et al. Estimates of aquifer hydraulic conductivity based on grain-size data and multiple regression techniques in Imo River Basin. Int J Energ Water Res (2023). https://doi.org/10.1007/s42108-023-00244-1
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DOI: https://doi.org/10.1007/s42108-023-00244-1