California Waters - Spring 2023 - Vol. III | Issue II
Neonicotinoid Findings
Article selected as one the feature papers to celebrate the inaugural issue of Agrochemicals.
California currently leads the world in hybrid sunflower (Helianthus annuus) seed production.
Partnership Aids Delta Smelt
A recent news article and video put out by the California Department of Water Resources credits the USGS.
Thanks to this project’s partnership with USGS and its sonar imaging system, the team is confident they are giving the fish the best chance possible for survival. - California DWR
Image courtesy of DWR
Heavy: Software for forward-modeling gravity change from MODFLOW output
Fortran software, named Heavy, was developed to simulate gravity change due to water-storage change in MODFLOW groundwater models. Heavy is compatible with MODFLOW-2005 and MODFLOW-NWT models using the layer-property flow or upstream weighting packages. All of the necessary information for the gravity calculation—the geometry of the model cells, the storage coefficient, and head change—is present
Five-year scientific study concludes
Results of Hexavalent Chromium Background Study in Hinkley, California
Hinkley: Six Page Summary
Natural and Anthropogenic Hexavalent Chromium, Cr(VI), in Groundwater near a Mapped Plume, Hinkley, California. This is a USGS publication series: Open-File Report (Fact Sheet Style). The publication should be cited as follows: Izbicki, J.A., Groover, K.D., Seymour, W.A., Miller, D.M., Warden, J.G., and Miller, L.G., 2023
Scientists Discuss Research at Geological Society of America Meeting
The Cordilleran Section of the Geological Society of America (GSA) includes the states of Alaska, California, Hawaii, Nevada, Oregon, Washington, and part of Arizona, as well as western Canadian provinces and Mexican states. It is the oldest of GSA's six regional sections, having been formed in 1901.
Sediment transport in two tributaries to the San Joaquin River immediately below Friant Dam—Cottonwood Creek and Little Dry Creek, California
Two tributaries to the greater San Joaquin River watershed, Cottonwood and Little Dry Creeks, in California’s Central Valley, were assessed for sediment and streamflow dynamics between October 1, 2011, and September 30, 2019. The two systems deliver sediment to the San Joaquin River below Friant Dam, California. Dams create downstream discontinuities in streamflow and sediment transport and theref
UAS mapping of surface roughness and digital grain size to assess pre-dam removal baseline conditions along the mainstem Klamath River corridor below Iron Gate Dam, California
Surface roughness and grain size in river corridors are fundamental indicators of river hydraulics. In hydraulic models for coarse-grained rivers, the roughness parameter is often assumed to be related to a representative grain diameter. This paper documents a workflow for using aerial imagery and Structure-from-Motion (SfM) photogrammetry to map surface roughness and digital grain size (DGS) on g
Multiresidue extraction of current-use pesticides from complex solid matrices using energized dispersive guided extraction with analysis by gas and liquid chromatography tandem mass spectroscopy
The development of sample processing techniques that recover a broad suite of pesticides from solid matrices, while mitigating coextracted matrix interferences, and reducing processing time is beneficial for high throughput analyses. The objective of this study was to evaluate the effectiveness of an automated extraction system for pesticide analyses in solid environmental samples. An Energized Di
Comparing domestic and public-supply groundwater quality in the northern San Joaquin Valley, 2019—California GAMA Priority Basin Project
Groundwater quality in the Northern San Joaquin Valley region of California was studied as part of California State Water Resources Control Board (SWRCB) Groundwater Ambient Monitoring and Assessment Program-Priority Basin Project (GAMA-PBP). The GAMA-PBP made a spatially unbiased assessment of the aquifer system used for domestic drinking-water supply in the study region and compared the results