Elevation point file for Lake McConaughy, Nebraska

Dates

Release Date: 2014-01-01
Publication Date: 2023-09-15

Citation

Swanson, R., 2014, Elevation point file for Lake McConaughy, Nebraska: U.S. Geological Survey data release, https://doi.org/10.5066/P9UFVZ2S.

Summary

These data were released prior to the October 1, 2016 effective date for the USGS’s policy dictating the review, approval, and release of scientific data as referenced in USGS Survey Manual Chapter 502.8 Fundamental Science Practices: Review and Approval of Scientific Data for Release. The U.S. Geological Survey, in cooperation with The Central Nebraska Public Power and Irrigation District (CNPPD), conducted a study that used bathymetric and topographic surveying in conjunction with Geographical Information Systems techniques to determine the 2003 physical shape and storage capacity, as well as the change in storage capacity of Lake McConaughy that occurred over 62 years. By combining the bathymetric and topographic survey data, the [...]

Summary

These data were released prior to the October 1, 2016 effective date for the USGS’s policy dictating the review, approval, and release of scientific data as referenced in USGS Survey Manual Chapter 502.8 Fundamental Science Practices: Review and Approval of Scientific Data for Release.

The U.S. Geological Survey, in cooperation with The Central Nebraska Public Power and Irrigation District (CNPPD), conducted a study that used bathymetric and topographic surveying in conjunction with Geographical Information Systems techniques to determine the 2003 physical shape and storage capacity, as well as the change in storage capacity of Lake McConaughy that occurred over 62 years. By combining the bathymetric and topographic survey data, the 2003 surface area of Lake McConaughy was determined to be 30,413.0 acres, with a volume of 1,756,300 acre-feet at the lake conservation-pool elevation of 3,266.4 feet above North American Vertical Datum of 1988 (3,265.0 feet above CNPPD datum). To determine the changes in storage of Lake McConaughy, the 2003 survey Digital Elevation Model (DEM) was compared to a preconstruction DEM compiled from historical contour maps. This comparison showed an increase in elevation at the dam site due to the installation of Kingsley Dam. Immediately to the west of the Kingsley Dam is an area of decline where a borrow pit for Kingsley Dam was excavated. The comparison of the preconstruction survey to the 2003 survey also was used to estimate the gross storage capacity reduction that occurred between 1941 and 2002. The results of this comparison indicate a gross storage capacity reduction of approximately 42,372 acre-feet, at the lake conservation-pool elevation of 3,266.4 feet in NAVD 88 (3,265.0 feet in CNPPD datum). By comparing preconstruction and 2003 survey data and subtracting the Kingsley Dam and borrow pit, the total estimated net volume of sediment deposited from 1941 to 2003 was 53,347,124 cubic yards, at an annual average rate of 860,437 cubic yards per year. The approximate decrease in the net storage capacity from 1941 to 2003 was 33,066 acre-feet, at an annual average decrease of approximately 533 acre-feet per year, which resulted in a 1.8 percent decrease in storage capacity of Lake McConaughy. The lake accumulated most of the sediment in the original river channel and in the west end of the delta area on the upstream end of the lake.

Contacts

Point of Contact :: U.S.Geological Survey, Nebraska Water Science Center, Lincoln, Nebraska, Robert Swanson
Originator :: U.S. Geological Survey Nebraska Water Science Center
Metadata Contact :: U.S. Geological Survey
SDC Data Owner :: Nebraska Water Science Center
USGS Mission Area :: Water Resources

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sir2005-5040_Lake_McConaughy_Nebraska_Elevation_Points.xml Original FGDC Metadata	View	17.22 KB	application/fgdc+xml
sir05-5040_Lake_McConaughy,_Nebraska_Elevation_Points.zip		2.92 MB	application/zip
sir05-5040_points.jpg		170.17 KB	image/jpeg

Related External Resources

Type: Related Primary Publication

Related Primary Publication	https://pubs.usgs.gov/sir/2005/5040/sir2005-5040.pdf

Type: browseImage

Illustration of data set	https://www.sciencebase.gov/catalog/file/get/631405d0d34e36012efa33bb?name=sir05-5040_points.jpg

Purpose

This data set was collected in order to document the current bed elevations throughout the reservoir in order to determine current storage capacity and to compare that to historic storage capacity. The data set consists of bathymetric elevation points derived from x,y,z hydrographic survey data and GPS data collected in the winter of 2002 and spring of 2003 by the U.S. Geological Survey along 123 transects covering the reservoir. Please reference http://pubs.er.usgs.gov/publication/sir20055040.

Elevation point file for Lake McConaughy, Nebraska

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