McKay Reservoir 1993 Sedimentation Survey.

摘要

This report presents the 1993 results of the first extensive sedimentation survey of McKay Reservoir by the Bureau of Reclamation since construction of McKay Dam. The primary objectives of the survey were to: gather data needed for developing new reservoir topography, compute area-capacity relationships, and estimate storage depletion caused by sediment deposition since closure of McKay Dam. Standard land surveying methods were used to establish horizontal and vertical control points for the aerial and hydrographic surveys. A horizontal grid system was established for both surveys using automated control points located in the reservoir area. The bathymetric survey was run using sonic depth recording equipment interfaced with an automated survey system consisting of a line-of-sight microwave positioning unit capable of determining sounding locations within the reservoir. The system continuously recorded reservoir depth and horizontal coordinates as the survey boat was navigated along close spaced gridlines covering the reservoir area. The positioning system provided information to allow the boat operator to maintain course along these gridlines. Water surface elevations measured by the land surveyors at the time of data collection were used to convert the sonic depth measurements to true lake bottom elevations.