Ndubuisi Eluozo, S. . “Effect of Formation Characteristics on Hydraulic Conductivity in Unconfined Bed in Etchie, Rivers State of Nigeria”. Scientific Journal of Pure and Applied Sciences, vol. 2, no. 1, Jan. 2013, pp. 1-9, http://sjournals.com/index.php/sjpas/article/view/1015.