This work shows the importance of rain gauge network analysis in the determination of the number of rain gauges that will accurately estimate the mean rainfall of an area. This research therefore looked at the two design approaches viz weighted and non-weighted approaches that will best estimate the number of rain gauges required in a catchment area. From this, it was established that the 87 existing and operating rain gauges in Nigeria is grossly inadequate and hence the need to improve the

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... sity to meet World Meteorological Organization (WMO) minimum requirement for the country's geographical location. To do this, the reallocated existing and operating rain gauges is added to the optimum results obtained through the weighted and non-weighted design approaches and hence improve on the existing network density. It is expected that financial considerations may play a role in determining the total number of gauges chosen for the country hence should be determined.