Name: Bathymetric Contours (Depth)

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Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Bathymetry Data Collection Method (2006-2013):</SPAN></P><P><SPAN>High precision sonar system, along with computer maps and global positioning systems, allow a dense pattern to be collected, with a location (latitude-longitude) coordinate for each depth measurement. The Kansas Biological Survey used a state-of-the-art, scientific-grade acoustic echosounding system from Biosonics Inc., Seattle, that integrates digital echosounding technology with a differential global positioning system (GPS) and real-time onscreen data preview.</SPAN></P><P><SPAN>Prior to conducting a bathymetric survey, researchers create a series of transect lines for the reservoir to guide a boat during the survey. Transect lines are spaced 100-150 meters apart for federal reservoirs and more closely, 25-50 meters apart, for smaller state and local lakes. Using GPS as a guide, the boat echosounder follow the transects around and across the lake, collecting five depth measurements every second.</SPAN></P><P><SPAN>After field acquisition of raw data, additional computer processing takes place at the Kansas Biological Survey offices. Researchers apply corrections to compensate for transducer depth. They also reference depth data to the lake elevation to create a file of lake bottom elevation values. The thousands of points of data are then interpolated to a surface, using mathematical models in a geographic information system, to create the bathymetric maps.</SPAN></P><P><SPAN>Bathymetric maps are representative of lake bottom contours at the time of the survey; the maps are not used for navigation, for any purpose relating to safety, or as professional survey reference. </SPAN></P><P><SPAN>Water surface elevations listed for federal reservoirs are based on the normal operating water level as determined by the U. S. Army Corps of Engineers or the U. S. Bureau of Reclamtion. Water levels for the state and local reservoirs are based on the water surface elevation as determined by the Kansas Biological Survey on the date of that reservoir's bathymetric survey. All reservoirs areas, volumes and shoreline lengths are based on these water surface elevations.</SPAN></P><P><SPAN>Majority of the funding was provided by the Kansas Water Office, the Kansas GIS Policy Board, and the Kansas Biological Survey.</SPAN></P><P><SPAN>Several federal and state agencies contributed to the compilation of this dataset. GIS processing was done at the Kansas Biological Survey.</SPAN></P></DIV></DIV></DIV>

Copyright Text: Kansas Biological Survey.

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