Stage-Storage and Bed Material Data from the 2020 Upper Letts Lake Survey, California
Dates
Publication Date
2021-10-25
Start Date
2020-10-11
End Date
2020-10-16
Citation
Haught, D., and Wright, S.A., 2021, Stage-Storage and Bed Material Data from the 2020 Upper Letts Lake Survey, California: U.S. Geological Survey data release, https://doi.org/10.5066/P92DPG93.
Summary
On October 13, 2020 a survey of Upper Letts Lake was conducted where both bathymetric and terrestrial lidar data were collected. Additionally, six bed material samples and three core samples were collected to understand the characterization of the grain-size of the lake bed. Survey data were merged with an additional lidar dataset from the USGS 3DEP program to create digital elevation model (DEM). The DEM was used to update the stage-storage and stage-surface area tables for the reservoir. This data release provides the following data sets; 1) bathymetric and terrestrial elevation data, 2) Combined bathymetric and 3DEP DEM, 3) stage-storage and stage-surface area tables from DEM, and 4) bed material grain-size and loss of ignition [...]
Summary
On October 13, 2020 a survey of Upper Letts Lake was conducted where both bathymetric and terrestrial lidar data were collected. Additionally, six bed material samples and three core samples were collected to understand the characterization of the grain-size of the lake bed. Survey data were merged with an additional lidar dataset from the USGS 3DEP program to create digital elevation model (DEM). The DEM was used to update the stage-storage and stage-surface area tables for the reservoir. This data release provides the following data sets; 1) bathymetric and terrestrial elevation data, 2) Combined bathymetric and 3DEP DEM, 3) stage-storage and stage-surface area tables from DEM, and 4) bed material grain-size and loss of ignition results (percent organics). Results show that the storage for the Upper Letts Lake is 377 acre-feet with a surface area of 34.5 acre at the elevation of the spillway outlet. Bed material samples show that the median diameter of the bed ranges from 0.044 to 0.094 mm, with the organic content ranging from 39 to 61 percent. Core samples show that the median diameter of the near-bed strata ranges from 0.868 to 1.342 mm, with the organic content ranging from 8 to 17 percent. For bed material samples, the average gravel, sand, silt, and clay percentages were 0%, 52%, 41%, and 7%, respectively. For core samples, the average gravel, sand, silt, and clay percentages were 61%, 26%, 12%, and 1%, respectively.
This survey was conducted to update the stage-storage and stage-surface area relations for Upper Letts Lake, CA. Additionally, we collected bed material data to characterize the grain-size of the sub-aqueous lake bed. Note: Two datasets exist in this release. One collected by the authors and one used as supplemental collected by the USGS 3DEP program (reference included in Sources). Files with the term "Combined" include both datasets merged, whereas files without this term do not have the USGS 3DEP data merged.
