Comparative Analysis of Existing and Optimal Maintenance Policy of Water Borehole Schemes in South Eastern States of Nigeria
A study optimising maintenance cost of water borehole schemes in South Eastern states of Nigeria (Abia, Anambra, Ebonyi, Enugu and Imo States) was carried out. Data was collected from 260 boreholes spread across all local government areas in the states. Optimisation results showed that for boreholes (submersible pumps) pumping once per day, the optimal preventive maintenance frequency and resulting savings in cost are 2 and N521,076 for Abia; 2 and N783,963 for Anambra; 2 and N458,242 for Ebonyi; 2 and N740,964 for Enugu; 2 and N605,187 Imo. For boreholes pumping twice per day, the optimal preventive maintenance frequency and resulting savings in cost are 5 and N1,896,301 for Abia; 4 and N3,692,655 for Anambra; 5 and N786,913 for Ebonyi; 4 and N4,187,161 for Enugu; 4 and N2,477,609 for Imo; and for boreholes pumping thrice per day; 8 and N2,798,330 for Abia; 7 and N8,372,862 for Anambra; 7 and N6,485,293 for Ebonyi; 10 and N4,014,240 for Enugu; 10 and N6,021,503 for Imo; with no downtime as opposed to the wasteful current practice of no preventive maintenance with downtime of up to 12 months or more. As a recommendation for a borehole scheme, there should be a check on the type of submersible pump and generator capacity as the choice made directly affects the total operational cost.
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