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 4OPERATIONS4.1 General Operations4.1.1 ScheduleTable 4-1 provides a schedule of operations.4.1.2 Dam VisitsA dam visit should be performed as indicated in the Operations Schedule (Table 4-1).Combine other operation activities with the dam visit if practical. All dam visitinformation should be recorded on an Operations Log form. At a minimum, for eachdam visit, the following are required:• Record the weather, reservoir water surface elevation, number of stoplogs, andattendance.• Drive (if applicable) or walk the dam crest from the right abutment to the left andback, scanning the entire dam for any change in condition or any of the conditionslisted in Table 2-1, Station Inspection Checklist.4.2 Instructions for Operational Components4.2.1 GeneralNot all FWS low hazard dams have identical features. The instructions for operationalcomponents provided herein have been generalized to address common features at thesedams and may include components that do not exist at some dams. Follow theinstructions for those components that apply.4.2.2 StoplogsAddition of stoplogs shall be started in sufficient time to permit completion before floodwaters reach the top of the structure sill. The stoplogs will be inspected frequently duringflood periods to ascertain that no undue leakage is occurring and that drains provided tocare for ordinary leakage are functioning properly. In preparation for closing stoplogstructures, all recesses should be thoroughly cleaned of sand, silt, and other materials.After the stoplogs have been placed with the neoprene seal on the downstream side,wedges should be driven tight to prevent floating. Leakage through the stoplogs can beprevented or largely overcome by applying caulking material or by tacking a tarpaulin orroofing paper over the upstream slope after the logs have been placed.Additional stoplogs should not be added to raise the lake level above the establishednormal pool level or cause frequent flow in the emergency spillway. Check with the4-1Revision No. 0October 2008

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