Information
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Document status
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Dam Name
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Dam location
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Dam owner / operator
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Basic information on the dam
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Photos of the dam
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Type of inspection
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Conducted on
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Weather conditions
- Sunny
- Cloudy
- Windy
- Light rain
- Heavy read
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Ground Moisture Condition
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Reservoir level
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Spillage?
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approximate discharge (m3/s)
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Inspector
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Attendees
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General notes
Previous inspection
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Previous dam inspection report available?
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Conducted on
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Inspector
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Main findings
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Conclusion
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Recommendations
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Comments
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Inspections provide insight on how the dam is operating under current weather conditions and there are also a way to monitor the dam’s performance. Early detection of gradual changes can minimize problems and reduce maintenance.
The dam should be inspected after a flooding event or post emergency situation to ensure there has been no structural damage and that all dam equipment is operating correctly.
Observations from visual inspections should be documented in a consistent manner, using standardized, site-specific inspection forms supplemented with photographic records. Surveillance documentation must adequately filed
Reservoir
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Slips or erosion evident?
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Trees, woody debris, trash present?
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Excessive sediment present?
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Reservoir general notes
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Reservoir photos
Dam
Upstream Slope
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Concrete deterioration?
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Most common types of concrete deterioration: disintegration, spalling, efflorescence, surface attack, alkali aggregate reaction, metal corrosion
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Surface defects?
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Most common types of surface defects: honeycomb, stratification, evidence of form slippage, stains, and impact damage.
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Cracks?
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Cracks survey should identify: characteristics (length, width, direction, depth and location).
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Displacements?
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There are two main types of displacement: misalignment and differential movement
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Joint damage/deterioration?
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Maintenance concern?
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Maintenance includes routine measures taken to protect and maintain the dam. Deficiencies: faulty drainage, undesirable vegetation, debris.
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Upstream slope general notes
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Sketch
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Upstream slope photo
Dam crest
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Concrete deterioration?
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Surface defects?
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Cracks?
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Displacements?
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Joint damage/deterioration?
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Maintenance concern?
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Crest general notes
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Sketch
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Crest Photo
Downstream Slope
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Concrete deterioration?
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Surface defects?
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Cracks?
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Displacements?
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Joint damage/deterioration?
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Leakages/seepage?
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Maintenance concern?
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Downstream slope general notes
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Sketch
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Downstream slope photos
Inspection or drainage Gallery
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Dam with an inspection/drainage gallery?
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Describe
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Concrete deterioration?
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Surface defects?
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Cracks?
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Displacements?
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Joint damage/deterioration?
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Leakages/seepage?
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Maintenance concern?
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Drains blocked?
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A noticeable decrease in seepage can indicate that a drain is becoming blocked. Blocked drains can lead to deterioration of the concrete, flooding of galleries, increased uplift, and potential stability problems.
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Gallery general notes
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Gallery photo
Abutment contacts (left/right)
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Left/right?
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Erosion?
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Differential movements?
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Cracks?
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Seepage?
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Abutment contacts general notes
Saddle dam(s)
- Saddle dam
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Brief description
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Saddle dam photo
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Saddle dam in satisfactory conditions?
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Comment on deficiency
Principal Spillway
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Approach channel: Instability of the side channel?
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Inlet free from debris?
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Trees and brush around the inlet?
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Type of spillway
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Description
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Weir in satisfactory conditions?
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Sign of deterioration?
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Sign of inadequacy?
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Descripiton
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Civil works in satisfactory conditions?
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Gate structural elements in satisfactory conditions?
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Gate appears watertight?
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Gate regularly operated/tested?
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Redundant power supply?
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Gate(s) general notes
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Description
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Trash rack and anti-siphon device in satisfactory conditions?
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Riser/inlet in satisfactory conditions?
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Conduit appear structurally sound including water tight joints?
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Signs of flow beneath or around the conduit?
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Chute spillway?
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Concrete lined?
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Spalling or scaling?
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Cracks?
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Erosion or cavitation damages?
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Exposed reinforcement?
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Slab movement/displacement or offset?
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Wall movement/displacement or offset?
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Leakage?
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Sign of deterioration?
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Sign of inadequacy?
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Chute with a drainage collection system?
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Outlet drains visible and clear of obstruction?
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Describe the amount of flow from the outlet.
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Signs of flow beneath or around the spillway outside of designated drains?
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Energy dissipation structure in satisfactory conditions?
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Sign of deterioration?
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Sign of inadequacy?
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Obstruction?
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Covered with debris?
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Erosion around the spillway outlet?
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Brush around the outlet?
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Chute spillway general notes
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Energy dissipation structure in satisfactory conditions?
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Erosion around the spillway outlet?
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Brush around the outlet?
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Spillway general notes
Auxiliary Spillway
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Dam with an auxiliary spillway?
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Description:
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Spillway free of obstructions?
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Spillway free from erosion?
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Auxiliary spillway general notes
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Auxiliary spillway photos
Bottom outlet(s)
- Bottom outlet
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Description
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Civil works in satisfactory conditions?
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Gates/valves and hoist equipment in satisfactory conditions?
Outlet work(s)
- Outlet work
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Brief description of the outlet work
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Civil works in satisfactory conditions?
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HM equipment in satisfactory conditions?
Dam surveillance
- Monitoring equipment
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Description of surveillance equipement
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Monitoring equipment photos
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Surveillance equipment in satisfactory conditions?
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Surveillance equipment reliable?
Dam surveillance
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Dam surveillance satisfactory?
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Surveillance of dam facilities includes both visual inspection and monitoring of any installed instrumentation. The goal of surveillance is to identify deviations in performance conditions so that corrective or risk mitigation measures can be implemented before adverse consequence results.
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In a dam monitoring system, the management of data, including all procedures beginning with the data acquisition and ending in the data analysis, interpretation and reporting, is accomplished in two main steps:
1) data processing (set of operations including the data checking, reducing and storage, and the execution of numerical and graphical outputs)
2) the subsequent analysis and interpretation of the dam behavior and including also the reporting of the corresponding results. -
Regular dam inspection?
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Correct monitoring data processing?
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Systematic analysis and interpretation of the readings?
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Surveillance general notes
Staff in charge of the O&M
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Dam correctly operated and maintained ?
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Staff with required knowledge, skills and training?
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O&M staff general notes
Dam safety management system (DSMS)
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Satisfactory DSMS in place?
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A DSMS, incorporating policies, responsibilities, plans and procedures, documentation, training, and review and correction of deficiencies and nonconformances, must be in place to ensure operational availability, safe operation and integrity of the dam.
A critical part of the DSMS is the development, implementation, and control of procedures for the operation and maintenance (O&M plan) and surveillance (instrumentation plan) of the facility, taking into account public safety and security (Emergency preparedness plan). The procedures and practices should be reviewed regularly to ensure that the information is up to date. -
Satisfactory documents management process?
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Documentation should be kept up to date so that there is a permanent record of (i) the design, construction, operation, and performance of the dam, and (ii) the management of its safety.
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Instrumentation Plan compliant with WB requirements?
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O&M Plan compliant with WB requirements?
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EPP compliant with WB requirements?
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Periodic Dam Safety Review?
Other items
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List
Recommendations
Perform the following ongoing maintenance:
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Exercise and perform required maintenance
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Remove debris from spillway inlet.
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Other (see notes):
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Notes
Monitor the following items that were detailed in previous sections of the report. Report any significant changes to the Dam safety specialist.
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Concrete deterioration
- Nothing noted at this time.
- Monitor and report changes to Dam safety specialist
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Displacements
- Nothing noted at this time.
- Monitor and report changes to Dam safety specialist
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Cracks
- Nothing noted at this time.
- Monitor and report changes to Dam safety specialist
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Leakage/Seepage
- Nothing noted at this time.
- Monitor and report changes to Dam safety specialist
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Under pressure
- Nothing noted at this time.
- Monitor and report changes to Dam safety specialist
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Other (see notes):
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Notes
The following items need to be properly repaired/rectified:
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Clean or repair drainage system
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Other (see notes):
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Notes
Employ an engineer/contractor experienced in design and construction of dams to:
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Update the hydrological study
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Update the structural study, incl seismic load
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Develop or update the dam safety plans (instrumentation, O&M and EPP)
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Repair or/and update surveillance equipement
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Evaluate and repair spillway structures
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Develop plans and specifications for proper repair of the dam.
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Instruct and train the staff in charge of O&M
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Develop and implement a Dam Safety Management System
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Other (see notes):
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Notes
Overall Condition
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SATISFACTORY
No existing or potential dam safety deficiencies recognized. Safe performance is expected under all anticipated loading conditions, including such events as infrequent hydrologic and/or seismic events.
FAIR
No existing dam safety deficiencies are recognized for normal loading conditions. Infrequent hydrologic and/or seismic events would probably result in a dam safety deficiency.
POOR
A potential dam safety deficiency is clearly recognized for normal loading conditions. Immediate actions to resolve the deficiency are recommended; reservoir restrictions may be necessary until problem resolution.
UNSATISFACTORY
A dam safety deficiency exists for normal conditions. Immediate remedial action is required for problem resolution. -
Overall Rating of Dam Condition
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General Notes
