Groundwater Resource Assessment by Hydraulic Properties Determination for Sustainable Planning and Development in Central Part of Ondo State, Nigeria
2020
OLUMUYIWA, Falowo OLUSOLA | BAMIDELE, Amodu MOSES
Determination of hydraulic properties for groundwater resources assessment in central area of Ondo State was carried out using pumping test, with sessions which lasted for a period of 7-12 hours for a total of 76 boreholes. The installation depths of the boreholes vary from 8.5 m to 49.7 m. The thickness of the aquifer units/screen length is in between 2.3 – 26 m and average (avg.) of 7.7 m. The yield capacity of the aquifer units varies between 17.28 (granite) – 110.59 m³/d (migmatite). The hydraulic conductivity calculated for the area ranges between 0.1382 – 48.1210 m/d (avg. 4.5487 m/d). The values of transmissivity derived from the area range between 2.4705 – 221.3568 m²/d (avg. 28.1690 m²/d). The storage coefficient or storativity calculated for all the aquifer units in the study area is fairly uniform and ranges from 0.000069 to 0.007496, and an (avg. 0.000974). Only 40% of the study area is characterized by good aquiferous units based on their hydraulics properties, which is prolific for groundwater exploitation and development. Even though an average yield value of 81 m³/d was obtained, suggestive of fair water bearing unit, capable of providing a reasonable satisfying and quantifiable amount of water for domestic uses.
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