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Online systems can be used to automatically monitor parameters which affect the stability of a dam such as reservoir level, dry beach length, height restrictions, internal displacement of the dam body, pore water pressure within the dam, seepage and turbidity of the seepage water. The stability of a dam can be assessed at any time and early warning provided of stability problems. The requirements of an online monitoring system are discussed in relation to monitoring points, data acquisition, analytical methods and instrumentation, and case studies are presented of systems which have been installed at the Lingnan, Xiadian and Hedong Au mines in Shandong, China., Online systems can be used to automatically monitor parameters which affect the stability of a dam such as reservoir level, dry beach length, height restrictions, internal displacement of the dam body, pore water pressure within the dam, seepage and turbidity of the seepage water. The stability of a dam can be assessed at any time and early warning provided of stability problems. The requirements of an online monitoring system are discussed in relation to monitoring points, data acquisition, analytical methods and instrumentation, and case studies are presented of systems which have been installed at the Lingnan, Xiadian and Hedong Au mines in Shandong, China.