The study attempted a municipal water supply planning in Oyo metropolis using a land based approach to prepare a long range forecast of water supply demand for Oyo metropolis with the aim of providing effective planning, development and operation of water supply and distribution networks which is one of the most essential compounds of urban infrastructure. The problem of water sector in Oyo metropolis was reviewed and the challenges which may result from the capacities of the facilities of the provision in Oyo metropolis was taken care of through the designs of facilities that will ensure adequate planning for, till the projected year. The study delineated the areas within the metropolis that are unserved or underserved by the water corporation. Geographic information system (GIS) was applied to existing distribution maps of the water corporation to present a graphic detail of the current state of facilities frame work for taking management of new facilities was given. Large scale facility maps that will serve as source of information for vital application for the Erelu water corporation in carrying out its daily function were produced. Such maps in digital forms are extremely vital and are useful to integrate collateral data, that is, available within the corporation.
Key words: Water supply, Oyo metropolis, Geographic Information System (GIS).
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