Automated monitoring at Tolt Dam

Article Abstract:

The Seattle Water Department upgraded the advanced warning system at the Tolt Dam facility to enhance its ability to monitor the conditions in the dam for safety purposes. The first phase of the project was to automate the dam safety monitoring activities, advanced warning capabilities and closed-circuit television surveillance. It was followed by the development of the data management plan and the loading of the associated database for the system's automated and manual instruments. The system did not produce false alarms when a 5.3 magnitude earthquake occurred in the region.

Equipment and supplies, Buildings and facilities, Automation, Seattle, Washington, Dam safety

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Monitoring prestressed structures

Article Abstract:

A combination of traditional and nondestructive testing techniques provides a basis for developing systems to monitor and manage prestressed and post-tensioned structures. The identification of damaged or corroded tendons helps decrease costs. Determining the condition of a prestressed structure necessitates an understanding of the condition of the post-tensioning system, as few external indications of damage are apparent. An acoustic-monitoring system that gives information about strand failures allows tracking of the capability of post-tensioned structures.

Methods, Testing, Stress analysis (Engineering), Prestressed concrete construction, Prestressed steel construction

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Rapid slope monitoring

Article Abstract:

Time-domain reflectometry (TDR) is a cheaper, faster and quicker technique for monitoring unstable slopes than traditional methods. TDR uses coaxial cables in place of inclinometers which reduces the costs of monitoring landslides sites. The cables are embedded in the ground and changes in their impedance are determined. The changes are due to ground movements that deform the cable. The location of the change is determined and the rate of change gives the rate of movement. TDR stores data in a computerized datalogger which can be accessed by a cell phone.

Observations, Landslides, Slopes (Physical geography), Slopes (Landforms), Reflectometer, Reflectometers, Coaxial cables

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