McMicken Dam

Based on the history of subsidence due to groundwater pumping, and the ground strains and fissuring that have developed due to consolidation of the underlying alluvial aquifer, AMEC and the Maricopa County (Arizona) Flood Control District determined there is a high probability of earth fissures developing in the soils underlying McMicken Dam.

As a component of the Fissure Risk Zone Remediation Project, eight coaxial cables totaling 2,868 meters (9,406 ft) were installed in trenches downstream of the dam to detect development of earth fissures. The automated monitoring system triggers a radio call to the ALERT control center when the verified difference between the baseline measurement and the current measurement at any location along a cable exceeds a preset alarm threshold.

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