Productivity and quality analysis of selected boreholes in Osun and Kwara States, Nigeria

Abstract

A study was conducted on the productivity and quality analysis of borehole water in Offa and Erin-Ile in Kwara State, and in Ilesa and Osogbo in Osun State, Nigeria.  Productivity of the borehole was carried out by pumping test to determine the discharge from the boreholes sampled.  Data about the boreholes were obtained from Hydrology Department of the Lower Niger River Basin Development Authority Ilorin, Kwara State (LNRBDA) and Rural Water and Environmental Sanitation Agency in Osun State (RUWESA).  Ten boreholes were sampled in Offa out of which seven were working.  Five boreholes in Erin – Ile were sampled out of which four were functional.  21 boreholes were sampled in Ilesa but only thirteen were working and three boreholes in Osogbo but only one was working.  All the boreholes sampled were free from E – Coli bacteria. Most chemicals analyzed were within the permissible limits of the Standard Organisation of Nigeria (SON) Act 2007 but magnesium contents were above the permissible limits (0.20) by a range of 0.09 mg/L, iron (II) above the limits (0.30) by a range of 0.50 mg/L.  Water from the boreholes of both states was suitable for human consumption.

Keywords: borehole, water quality, productivity of borehole, aquifers, transmissibility