Bathymetry and Storage Capacity of Dierks Lake, Arkansas

A bathymetric survey of Dierks Lake, Arkansas, was conducted in late June - early July, 2018, by the Lower Mississippi-Gulf Water Science Center (LMG WSC) of the U.S. Geological Survey (USGS) using methodologies for sonar surveys similar to those described by Wilson and Richards (2006) and Richards and Huizinga (2018). Point data from the bathymetric survey were merged with point data from an aerial LiDAR survey conducted in 2016 by the National Resources Conservation Service (NRCS; U.S. Geological Survey, 2017). From the combined point dataset, a terrain dataset (a type of triangulated irregular network, or TIN, model) was created in Esri ArcGIS, version 10.5, for the area encompassing the approximate extent of the flood pool of the lake as defined by the 557.592-ft contour of the LiDAR data. Products in this data release include an Esri file geodatabase and three digital elevation models (DEMs). The Esri file geodatabase contains: 1) a feature dataset of a clipping polygon of the extent of the LiDAR data used in the study, point data from the bathymetric and LiDAR surveys, and the terrain dataset; 2) a clipping polygon of the 559 ft NAVD88 contour of the LiDAR data; 3) bathymetric contours at 10-ft intervals; and 4) a table of volume (storage capacity) of the lake at 1-ft increments in water surface elevation from 444-558 ft above the North American Vertical Datum of 1988 (NAVD88). Storage capacity was also computed for seasonal conservation pool elevation 526.092 NAVD88, and flood pool elevation 557.592 ft NAVD88. Two of the three DEMs represent the extent of the LiDAR data used in the study, one in units of meters and the other in units of feet; the third represents the approximate extent of the flood pool of Dierks Lake, defined by the 559 ft NAVD88 polygon, and is in units of feet. References: Richards, J.M. and Huizinga, R.J., 2018, Bathymetric contour map, surface area and capacity table, and bathymetric difference map for Clearwater Lake near Piedmont, Missouri, 2017: U.S. Geological Survey Scientific Investigations Map 3409: 1 sheet, https://doi.org/10.3133/sim3409. U.S. Geological Survey, 2017, Lidar Point Cloud - USGS National Map 3DEP Downloadable Data Collection: U.S. Geological Survey, https://nationalmap.gov/3DEP. Wilson, G.L., and Richards, J.M., 2006, Procedural Documentation and Accuracy Assessment of Bathymetric Maps and Area/Capacity Tables for Small Reservoirs: U.S. Geological Survey Scientific Investigations Report 2006-5208, https://pubs.usgs.gov/sir/2006/5208/.