American Journal of Geophysics, Geochemistry and Geosystems
Articles Information
American Journal of Geophysics, Geochemistry and Geosystems, Vol.5, No.4, Dec. 2019, Pub. Date: Nov. 28, 2019
Spatial Distributions of Aquifer Hydraulic Properties from Pumping Test Data in Anambra State, Southeastern Nigeria
Pages: 119-128 Views: 229 Downloads: 149
[01] Christopher Chukwudi Ezeh, Department of Geology and Mining, Enugu State University of Science and Technology, Enugu, Nigeria.
[02] Austin Chukwuemeka Okonkwo, Department of Geology and Mining, Enugu State University of Science and Technology, Enugu, Nigeria.
[03] Emeka Udeze, Anambra State Rural Water and Sanitation Agency (ANARUWASA), Awka, Nigeria.
Spatial distributions of aquifer hydraulic properties were carried out from direct pumping test data in Anambra State, Southeastern Nigeria. The study area lies within longitudes 06° 38I and 007° 15IE and latitudes 05°42I and 006°45IN within an area extent of about 4844sqkm (1870sqmi), underlain by four main geological formations. Pump testing was carried out in over one hundred (100) locations in the study area. The single-well test approach was used, employing the constant discharge and recovery methods. The Cooper-Jacob’s straight-line method was used to analyze the pump test results. This enabled the computing of the aquifer hydraulic properties. Correlated borehole logs show total depth range of 80meters to 250meters, with lithologic sequence of top sandy clay – medium to coarse grained sand – clay/shale – sand/sandstone, with the medium to coarse grained sand thickly underlying the central part of the study area. Static water level ranges from 100meters to 260meters at the central part and 10meters to 90meters at the adjoining areas. Aquifer transmissivity values range from 5m2/day to 80m2/day, indicating variable transmissivity potentials, while hydraulic conductivity values range from 0.5m/day to 6.0m/day. Various 2D maps of aquifer transmissivity, hydraulic conductivity, static water level, drawdown, aquifer yield, specific capacity, aquifer depth, hydraulic head and storativity were constructed to show their spatial distributions in the study area. These maps could serve as a better exploration model for groundwater production in future.
Aquifer Hydraulic Properties, Pumping Test, Single-well Test, Cooper-Jacob
[01] Hamill L, Bell FG, (1986). Groundwater resources development. University press Cambridge. 344 p.
[02] Rushton KR, (1973). River Basin groundwater development. Symp. J. Inst. Water Engrs Sci. Vol. 27, pp 275-276.
[03] Kruseman GP, de Ridder NA, (1994). Analysis and evaluation of pumping test data. International Institute for land reclamation and development, Wageningen. 3rd Edition. Vol. 11
[04] Ayers JF, (1989). Conjunctive use of geophysical and geological data in study of an alluvial aquifer. Groundwater. Vol. 27, pp 625-632.
[05] Allen DJ, Brewerton LJ, Coleby LM, Gibb BR, Lewis MA, MacDonald MA, Wagstaff SJ, Williams AT, (1997). The physical properties of major aquifers in England and Wales. British Geological survey technical report. WD/97/34.
[06] Olayinka A, Barker R, (1990). Borehole siting in Crystalline Basement areas of Nigeria with a Microprocessor- Controlled Resistivity traversing system. Groundwater. Vol. 28, No. 2, pp 178-183.
[07] Mc Neil JD, (1990). Use of Electromagnetic methods for groundwater studies. Society of Exploration Geophysicists (SEG) Tulsa. Vol. 11, pp 191-218.
[08] Beresnev IA, Hruby CE, Davies CA, (2002). The use of Multielectrode Resistivity Imaging in Gravel prospecting. Journal of Applied Geophysics. Vol. 49, No. 4, pp 245-254.
[09] Dahlin T, (1996). 2D Resistivity surveying for Enviromental and Engineering applications. First Break. Vol. 14, No. 7, pp 275-283.
[10] Sattar GS, Keramat M, Shalid S, (2014). Deciphering transmissivity and hydraulic conductivity of the aquifer by vertical electrical sounding (VES) experiments in Northwest Bangladesh. Applied water science. Original article.
[11] MacDonald AM, Burleigh J, Burgess WG, (1999). Estimating Transmissivity from surface resistivity sounding: An example from the Thames Gravels. Quarterly Journal of Engineering Geology. Vol. 32, pp 199-205.
[12] Okoro EI, Egboka BCE, Anike OL, Enekwechi EK, (2010). Evaluation of Groundwater potentials in parts of the escarpment areas of Southeastern, Nigeria. International Journal of Geomatics and Geosciences. Vol. 1. No. 3. Pp 544-551.
[13] Nwajide CS, (2013). Geology of Nigeria’s sedimentary Basins. CSS press. 1st edition. 565 p.
[14] Reyment RA, (1965). Aspects of Geology of Nigeria. Ibadan University press. 136p.
[15] Offodile ME, (2002). Groundwater study and development in Nigeria. 2nd Edition. Mecon geology and Engineering services Ltd. Jos, Nigeria. 453 p.
[16] Cooper HH Jr, Jacob CE, (1946). A generalized graphical method for evaluating formation constants and summarizing well-field history. Transactions, American Geophysical Union. Vol. 27, pp 526-534.
[17] Oborie E, Udom GJ, (2014). Determination of aquifer transmissivity using geoelectrical sounding and pumping test in parts of Bayelsa State, Nigeria. Peak Journal of physical and environmental science research. Vol. 2, No. 2, pp 32-40.
[18] Razack M, Huntley D, (1991). Assessing transmissivity from specific capacity data in a large and heterogeneous alluvial aquifer. Groundwater. Vol. 29, No. 6, pp 856-861.
[19] Mace RE, (1997). Determination of transmissivity from specific-capacity tests in a Karst aquifer. Groundwater. Vol. 35, No. 5, pp 738-742.
[20] Okonkwo AC, Ezeh CC, Opara AI, (2013). Estimates of Aquifer transmissivity from Specific capacity data in Sandstone aquifers in Enugu State, Southeastern Nigeria. Int. Res. J. Geo & Mining. Vol. 3, No. 8, pp 291-297.
[21] World Gazette. (2011). Colourful map of Nigeria with 36 states.
[22] Fetter CW, (2001). Applied Hydrogeology. Prentice hall, Inc. 4th Edition. 596 p.
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