RMZ â MATERIALI IN GEOOKOLJE

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378 Sunmonu, L. A., Adagunodo, T. A., Olafisoye, E. R., Oladejo, O. P.Table 4. Aquifer potential as a function of overburden anisotropic coefficient.Anisotropy Coefficient (λ)RangeWeighting2 10of the Eastern side of the study areashowed that overburden’s coefficientof anisotropy (λ) is high. Also, somepeaks were observed at Southern to theSouthwestern part of the study area.These areas with peaks are the promisinglocations for groundwater prospect.Olorunfemi et al, (1991) gives themean coefficient of anisotropy of igneousand metamorphic rocks of theBasement Complex of southwesternNigeria as 2.12 and 1.56 respectivelyand that groundwater yields increaselinearly with increase in λ (Olorunfemi& Olorunniwo, 1985; Olorunfemiet al, 1991; Olorunfemi & Okhue,1992). All the values of λ obtained fallwithin the range of areas underlain bymetamorphic rocks in the southwesternNigeria.Since the yield of a well in the BasementComplex is expected to have apositive correlation with the value ofthe overburden anisotropic coefficient,weights, ranging from a minimum of2.5 for λ less than 1 to a maximumof 10 for λ exceeding 2 have been assigned(table 4).Weathered Layer Isothickness MapThe weathered layers as defined inthis work are materials constitutingthe regolith, straddled in between thetopsoil or laterite and fractured or freshbedrock. The thickness of these lithologicalmaterials varies between 2.4 mand 18.8 m. This was determined fromthe layer interpretation of the soundingresults. The weathered layer isopachmap was produced using a contourinterval of 1 m (figure 6). The mapwas produced with a view to observinghow the weathered basement layerconsidered to be the major componentof the aquifer in the study area variedfrom place to place.The weathered layer is seen to bethickest at Eastern, some part of theNortheastern region and Southern partof the study area, groundwater potentialis most prominent here. The Westernand peak of the Southeastern partof the study area showed a very thinweathered layer.<strong>RMZ</strong>-M&G 2012, 59
The groundwater potential evaluation at industrial estate Ogbomoso, ...379Figure 6. Weathered layer isothickness mapWeathered Layer Isoresistivity MapIn order to have an insight to thegroundwater potentials of the studyarea, an aquifer resistivity map (figure7) was produced from the interpretedVES data results of this work.The resistivity value of the aquifersat each VES site location was plottedand contoured at 5 Ω m. The map wasproduced in order to distinguish highwater-bearing weathered layer fromlow water-bearing ones, and to find outwhether or not the degree of weathering/saturation varies from point topoint in the study area.As shown on the map, the resistivityvalue of the aquifer is highest at theNortheastern (i. e. VES 8 and VES9) part of the study area which fallswithin medium potential condition (table5). However, the Southern part (i.e. VES 6) and the Western part (i. e.VES 4) of the study area showed lowresistivity values. The Southern partmight be the most promising locationfor groundwater prospect because ofthe results from VES curve 6 (Wright,1990; Meju et al., 1999). The Westernpart (i.e. VES 4) could be consideredas another promising area for groundwaterprospect but because of its thinoverburden (Lenkey at al., 2005), thewater present in the aquifer might notbe able to serve the industrial purposesin the time of prolonged dry season.<strong>RMZ</strong>-M&G 2012, 59
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Page 34 and 35: 360 Akinola, O. O., Talabi, A. O.A
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Page 66 and 67: 392 Shemetov, P. A., Bibik, I. P.in
Page 68 and 69: 394 Shemetov, P. A., Bibik, I. P.
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466 Lajovic, A.Enourni film je mars
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470 Medved, J., Rosina, A., Vončin
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472 Author’s IndexAuthor`s Index,
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Contents476Phase contrast method fo
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Contents47859/4Calculation of stres
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Instructions to authors481Compositi
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Instructions to authors483NAVODILA
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Instructions to authors485Knjige:Ro
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Template487TEMPLATEThe title of the
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