U.S. Fish & Wildlife Service Low Hazard Dams - Association of State ...

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U.S. Fish & Wildlife Service Low Hazard Dams - Association of State ...

STANDING OPERATING PROCEDURESCHAPTER 5MAINTENANCE5.1 GeneralA good maintenance program will protect a dam against deterioration and prolong its life. Apoorly maintained dam will deteriorate, and may fail. Nearly all the components of a dam andthe materials used for its construction are susceptible to damaging deterioration if not properlymaintained. Lack of proper maintenance can lead to deterioration, can make inspection difficult,may cause critical components such as flood gates to be inoperable when needed, and mayultimately cause the dam to fail. The cost of a good maintenance program is small compared tothe cost of major repairs.Routine maintenance must be performed on the dam and its appurtenant structures. Any unusualconditions noted when performing maintenance, which may adversely affect the safety of thedam, should be immediately reported to the Refuge Manager.The regular schedules for maintenance are given in the Operations Schedule (Table 4-1).Recommendations for correcting common dam deficiencies are also provided in Appendix B.5.2 Operational Components5.2.1 StoplogsThere is no regularly scheduled maintenance for stoplogs. Replace a stoplog if itbecomes excessively deteriorated. When not in use, store the stoplogs on a flat, hardsurface, elevated with blocks. Maintain the hoisting equipment in accordance with thehoist manufacturer’s recommendations.5.2.2 Sluice Gate(s)To assure good operation and maintenance of sluice gates, all gates should be exercisedand inspected for the condition of all gate components as part of the normal dam andreservoir Operations Schedule (Table 4-1). The recommended procedure to ensure thesmooth operation of outlet gates is to operate all gates through their full range at leastonce a year and preferably more often. Some manufacturers recommend operating gatesas often as four times a year. Because operating gates under full reservoir pressure canresult in large outlet discharges, schedule gate testing during periods of low storage, ifpossible, or else operate them during periods of low stream flow. If large releases areexpected, only have the outlets tested after coordinating releases with the local floodplainadministrator and other dam owners located downstream and after notifying downstreamresidents and water users.5-1Revision No. 0October 2008