A dam monitoring system is a critical part of any dam safety program. It allows dam operators to know the water level behind a dam and detect when water is leaking from the dam. The monitoring system can notify the appropriate authorities to intervene when that happens.
According to the leaders in the field Silixia, if you’re concerned about the safety of your dam, you must know how a DMS (dam monitoring system) works. This post will go over the different types of systems and their purposes.
We’ll also discuss what you need to know about DMS installation and maintenance, so you can make sure your dam monitoring system is properly functioning.
Water-Level Monitoring
This system is used to measure the height of water behind a dam. The data are transmitted through telemetry to a monitoring center, where operators can evaluate the amount of water in storage.
Water-level monitoring systems can also detect leaks in some dams. When there’s a leak, the current water level is lower than usual. The DMS detects the change, and an alarm alerts the operator to the leak so that it can be addressed before it causes any damage.
Water Velocity Monitoring Systems (VWMS)
Water velocity monitoring systems measure and record water levels at critical points along a dam at regular intervals. This allows operators to identify changes in flow rates that may be due to erosion and landslides or other dangers associated with dam safety issues.
Infrared Monitoring (IRMS)
An infrared monitoring system measures the amount of infrared radiation emitted by the water. A sudden change in this level signals a change in the amount of heat released from the water and can indicate a leak or erosion. IRMS systems are often combined with VWMSs for better results.
Acoustic Monitoring (AM)
Acoustic monitoring systems reveal dam movements, such as cracking and tilting, through monitoring changes in noise levels on the dam’s surface. These changes in noise can be detected from distances up to 10 miles away from the dam wall. Hence, an acoustic monitoring system is perfect for fish ladders, measuring other large periods of flowing water, or remote applications where it’s too dangerous to send people for visual inspection and testing.
Acoustic conductivity sensors detect changes in surface noise caused by structural damage and erosion by sending out pulses of sound waves, which measure echoes and then convert that data to information about surface changes.
Vibration Monitoring (VM)
Vibration monitoring systems are used when concerns about structural damage or facing outflow losses in a dam. They are also applicable when leak detection needs to be sensitive, especially on small displacements or cracks.
Vibration monitors use a motor spinning two resonant rapidly moving plates attached to opposite sides of the surface of the dam and measure vibration data at various points on the dam wall. Vibration monitoring is a powerful tool for detecting minimal distortions that could indicate the beginning of erosion on a dam structure.
It is important to learn all that you can about the different types of inspection technologies available and the different methods of use so that you can make an informed decision about what will work best for your needs. You must assess them individually to get the pros and cons of each option.
Quick Tips for Installing Dam Monitoring Systems
• Be sure to include protective options for the sensors.
• Observe sensor placement guidelines for the type of monitoring system being used.
• Be sure to place sensors in locations that are easy to access and that can be easily removed and replaced if necessary.
• Make a note of all cable connections, especially when moving around sites or testing changes in position.
• Isolate each cable before disconnecting it from the sensor and use adhesive duct tape to secure the wires during installation or removal before reconnecting them with their connectors
• If you must move a cable during installation or removal, leave it connected at both ends so that if there is a break, it’s caught before causing damage to any surfaces.
Structural Health
Good structural health is a good investment, which can pay its way quickly. However, the more we learn about keeping our dams safe and leak-free, the better we can reduce these costs. It’s gratifying to see that these new technologies make it possible to do this while maintaining an increased level of safety on your dams.