Groundwater flow of the basement terrains of the Ibarapa region was studied by carrying out pumping test and measurement of borehole inventory. The view was to identify the associated aquifer systems from the time-drawdown curves, quantify the estimable hydraulic properties and develop hypothetical models for the understanding of the groundwater flow in the area underlain by diverse crystalline bedrocks. Three aquifer types were identified namely, dual, leaky and regolith. The yield of groundwater in dual and leaky aquifers that dominated terrains underlain by amphibolite and gneisses was sustainable, but the discharge of regolith aquifers mainly associated with migmatite and granite terrains declined at late pumping stage. The transmissivities of the dual and leaky aquifers were between 2.02 and 11.65 m2/day, while those of regolith aquifers were mostly less than 1.00 m2/day. The average aquifer transmissivities in m2/day by bedrocks were: 6.85, 2.57, 0.76 and 1.72, correspondingly. The inter-relationships between transmissivities and groundwater discharge showed diverse aquifer representations, from sustainable high-yielding to unsustainable low-yielding types. Conscientious effort is, therefore, required for well construction in the area.
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 Acworth, R.I. (1987): The development of crystalline basement aquifers in a tropical environment. Quarterly Journal of Engineering Geology, 20, pp. 265–272.
 Wright, E.P., Burgess, W.G. (1992): Hydrogeology of crystalline basement aquifers in Africa. Geological Society Special Publication, 66, pp. 1–27.
 Akanbi, O.A. (2016): Use of vertical electrical geophysical method for spatial characterisation of groundwater potential of crystalline crust of Igboora area, southwestern Nigeria. International Journal of Scientific and Research Publications, 6(3), pp. 399–406.
 Akanbi, O.A. (2017): Hydrogeologic characterisation of crystalline basement aquifers of part of Ibarapa area, southwestern Nigeria. Ph. D. Thesis. University of Ibadan, Faculty of Science, Department of Geology: Ibadan, 312 p.
  Akanbi, O.A., Olukowade, J.O (2018): Lithologic Characterisation of the Basement Aquifers of Awe and Akinmorin Areas, Southwestern Nigeria. Global journal of geological sciences, 16, pp. 1–11, DOI: 10.4314/gjgs.v16i1.1.
 Dada, S.S. (1998): Crust-forming ages and Proterozoic evolution in Nigeria: a reappraisal of current interpretations. Precambrian Research, 87, pp. 65–74.
 NGSA, (2009): Geological and mineral resources map of south-western zone, Nigeria. Nigerian Geological Survey Abuja, Nigeria.
 Singhal, B.B.S., Gupta R.P. (1999): Applied hydrogeology of fractured rocks. Kluwer Academic Publishers: Dordrecht, 400 p.
 Kruseman, G.P., de Ridder, N.A. (2000): Analysis and evaluation of pumping test data. 2nd edition. International institute for land reclamation and improvement: Wageningen, 377 p.
 Jones, H.A., Hockey, R.D. (1964): The geology of part of south-western Nigeria. Bull. Geol. Surv. Nigeria, 31.
 Akanbi, O.A. (2018): Hydrogeological characterisation and prospects of basement aquifers of Ibarapa region, SW Nigeria. Applied Water Science, 8(3), 89, DOI: 10.1007/s13201-018-0731-9.
 Phillippe, R., Damian, G., Miguel, M. (2008): Understanding diagnostic plots for well-test interpretation. Hydrogeology Journal, 17, pp. 589–600.
 Cooper, H.H., Jacob, C.E, (1946): A generalized graphical method for evaluating formation constants and summarising well field history. American Geophysical Union Transactions, 27, pp. 526–534.
 Fetter, C.W. (2007): Applied hydrogeology. 2nd edition. Merrill Publishing Company: USA, 592 p.
 Akanbi, O. A. (2018): Groundwater Occurrence from Hydrogeomorphological Study of Hard Rock Terrain of part of SW Nigeria. Materials and Geoenvironment, 65(3), pp. 131–143, DOI: 10.2478/rmzmag-2018-0011.
 Alley, W.M., Reilly, T.E., Franke O.L. (1999): Sustainability of groundwater resources. U.S. Geological Survey Circular 1186.