ABSTRACT
This study investigates the optimum use to which a number of wells, sunk for water supply to the Ipaja Housing Estate in Lagos State could be put. The study is in two parts. The first part involves graphical analysis of the available pumping test data from sixteen wells located within the estate to determine the hydraulic characteristics of the underlying aquifer being tapped. In the second part, the regional groundwater reservoir is represented by a radial flow numerical model. The model was used to verify the aquifer properties. A sensitivity analysis was carried out to investigate the effect of varying model input parameters on model suits. A study of the model results show that a minimum drawdown value optimum performance of the well field is attained when all 16 are put into operation in meetinq the estate's daily requirement of 12000m3 of water.