Journal of Hydrogeology & Hydrologic EngineeringISSN: 2325-9647

Research Article, J Hydrogeol Hydrol Eng Vol: 5 Issue: 4

Saturated Hydraulic Conductivities and High Yield Zones in the Phreatic Aquiferous Formations in Kumba – Cameroon: Determined From Slug-In Tests in Dug Wells

Akoachere Richard Ayuk II* and Ngwese Yolande Mesode
University of Buea, Faculty of Science, Department of Geology, P.O. Box 63. Buea, South West Region, Cameroon
Corresponding author : Akoachere Richard Ayuk II
University of Buea, Faculty of Science, Department of Geology, P.O. Box 63. Buea, South West Region – Cameroon,
Tel: +2376 797 621 51
E-mail: [email protected]
Received: December 28, 2016 Accepted: January 18, 2017 Published: January 25, 2017
Citation: Akoachere RA and Ngwese YM (2016) Saturated Hydraulic Conductivities and High Yield Zones in the Phreatic Aquiferous Formations in Kumba – Cameroon: Determined From Slug-In Tests in Dug Wells. J Hydrogeol Hydrol Eng 5:4. doi:10.4172/2325-9647.1000144

Abstract

Kumba (latitudes: 4°36’-4°40’, longitudes: 9°23’- 9°29’), the economic capital of the Southwest Region- Cameroon, is located along the Cameroon Line at northwestern edge of the Douala Basin. This study aimed at determining the saturated hydraulic conductivities and high yield zones of the phreatic aquiferous formations in Kumba using slug-in tests in hand-dug wells, to guide the design and selection of sites for construction of wells capable of yielding pumping rates compatible with the users’ needs. A field geological mapping exercise was carried out in Kumba. There are over 4500 dug wells in Kumba. The wells are dug and completed according to the owner’s budget. Some have lids, other do not have collars, some have aprons, while others are inclined. Slugin tests were carried out at 11 sites using a 30 liters, 35 kg (45cm long 30cm diameter high pressure non deformable PVC round edged cylindrical water filled) slug. The quasisteady model of wellaquifer interaction for slug-in testing was adopted and spreadsheet interpretation by the Bouwer and Rice and Vivier methods gave minimum hydraulic conductivity values range from 2.88E-08m/d at Lawyer Enow to 1.60 E-06 m/d at New Quarters; and maximum values range from 1.81E-08 m/d at Lawyer Enow to 2.96E-06 m/d at New Quarters with an average of 2.41E-07 m/d. First estimates of dug well yields range from 2.36 m3 /d (at Akale Street) to 17.36 m3 /d (at New Quarters) with an average of 7.64 m3 /d with the relative high well yields zones at New Quarters, CCAS and Nkamlikum. The phreatic aquiferous formations in Kumba have averagely low saturated hydraulic conductivities with the lowest values at Lawyer Enow and the highest at New Quarters. The first estimations of well yields were lowest at Mile 1, Anglican, GS and Akale Street and highest at New Quarters, CCAS and Nkamlikum. These aquiferous formations are made up of dense clays, dense sandstones, dense limestones, dolomites, fractured gneisses, vesicular basalts, dense basalts and claystones layers with different permeabilities.

Keywords: Slug-in test; Large diameter wells; Partially penetrating wells; Dugwells; Yield; Saturated hydraulic conductivity; Kumba-cameroon

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