6.5.2.1. Types of Maintenance Maintenance works include operations performed in preserving system and facilities in good or near-original condition. Repairs are part of maintenance. Maintenance can be of the following types (29):
1.
Normal
— usual; done annually
2.
Emergency
—
done under unusual conditions affecting adversely the safety of the
system.
3.
Deferred
— routine/normal ones deferred because of shortage of funds/machines,
affects adversely hydraulic performance.
4.
Catch-up
—
programme that takes care of deferred maintenance
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5. Preventive
— takes care of the causes creating the maintenance needs when they
are only minor
Rehabilitation — renovation needed due to accumulation of deferred maintenance ;
otherwise, only for ageing structures
Modernisation — updating/improving the system to meet enhanced social, technical,
economic activities.
‘Walk-thru’— two or three individuals walking along canals, taking notes on
maintenance needs
9. Special — due to unforeseen mishaps such as breaches.
6.5.2.2. Maintenance Policy The maintenance policy should include directions on
degree to which preventive maintenance is to be relied upon
appropriateness of deferring maintenance of components for which plans have been approved for rehabilitation or modernisation
relationship among maintenance, rehabilitation and modernisation