Erdman Anthony responded to an emergency situation at the Mount Morris Dam,
which controls the upper portion of the Genesee River and, since its
construction in 1952, has prevented major flooding within the Genesee Basin
south of the City of Rochester. An unseasonably mild winter had caused the
collapse of a large section of rock outcropping along the westerly gorge area.
The rockslide emptied a vast amount of rock and mud on the access road that
leads to the control center for the dam. Erdman Anthony's proximity to the dam,
prior survey work at the site, and ability to mobilize its survey team quickly
led the U.S. Army Corps of Engineers to select the firm for the emergency survey
Erdman Anthony worked closely with the project team members to
develop aerial mapping and digital terrain data to formulate a mitigation plan.
A number of data capture techniques were discussed, including the use of
terrestrial photogrammetric methods. The optimum approach proved to be a
combination of conventional photogrammetric procedures and laser
distant-measuring techniques. This proved to be the most cost-effective and
expedient means of mapping the collapsed embankment section.
Anthony was able to photograph, survey, and complete the photogrammetric mapping
in less than three weeks. The final deliverables included three-dimensional
models of the remaining rock outcrop area as well as the slide configuration.
The data were used to analyze the current conditions and develop a plan to
prevent future recurrences. Erdman Anthony was selected to perform the
post-construction survey to assist the Army Corps of Engineers and design
engineer in monitoring the contractor's final remediation work.
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