Supervisory Hydrologist
California Water Science Center
Email:
jahansen@usgs.gov
Office Phone:
916-278-3076
Fax:
916-278-3070
ORCID:
O365
Location
California District Office - Placer Hall
Placer Hall
6000 J Street
Sacramento
, CA
95819-6129
US
Supervisor:
Joseph L Domagalski
|
Groundwater-quality data collected between 1993 and 2015 were compiled from the U.S. Geological Survey (USGS) National Water Information System (NWIS) database for 722 wells in the San Joaquin Valley (SJV). Groundwater-quality data retrieved included lab analyses of complete major ion data (calcium, magnesium, sodium, potassium, chloride, sulfate, nitrate, alkalinity, bicarbonate, carbonate, silica, and TDS) for 613 samples, and an additional 109 samples with measured values of specific conductance. Most of these wells were sampled as part of the California Groundwater Ambient Monitoring and Assessment (GAMA) Program Priority Basin Project or the USGS National Water Quality Assessment (NAWQA) Program. In addition...
Categories: Data;
Types: Citation,
Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Agriculture,
California,
Central Valley,
Environment,
GAMA, All tags...
Geochemistry,
Geographic Information Systems (GIS),
Groundwater,
Hydrogeology,
Hydrology,
NAWQA,
PHREEQC,
Public Supply Water Use,
San Joaquin Valley,
Total Dissolved Solids (TDS),
Trends,
United States,
Water Quality, Fewer tags
|
Mendenhall and others (1916) published depth-to-water data compiled in 1910 for all known wells in the San Joaquin Valley, California. Data for the 3,429 wells having depth-to-water of greater than zero feet were used to construct an interpolated depth-to-water surface for the entire SJV. This map represents groundwater levels in approximately 1910, prior to extensive development of the groundwater system. A depth-to-water contour map with contour lines of 5, 10, 15, and 25 meters below land surface was then drawn from this raster surface.
Types: Citation,
Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Agriculture,
ArcGIS,
California,
Central Valley,
Depth-to-Water, All tags...
Groundwater,
Historic,
Hydrogeology,
Hydrology,
Public Supply Water Use,
San Joaquin Valley,
United States, Fewer tags
|
The goal of this study was to develop a suite of inter-related water quality monitoring approaches capable of modeling and estimating the spatial and temporal gradients of particulate and dissolved total mercury (THg) concentration, and particulate and dissolved methyl mercury (MeHg), concentration, in surface waters across the Sacramento / San Joaquin River Delta (SSJRD). This suite of monitoring approaches included: a) data collection at fixed continuous monitoring stations (CMS) outfitted with in-situ sensors, b) spatial mapping using boat-mounted flow-through sensors, and c) satellite-based remote sensing. The focus of this specific Child Page is to present all field and laboratory-based data associated with...
Categories: Data;
Tags: Lower Sacramento,
San Francisco Bay,
San Joaquin Delta,
chemical analysis,
datasets, All tags...
dissolved metals,
environment,
field monitoring stations,
field sampling,
laboratory methods,
mercury,
mercury analysis,
nutrient content (water),
oxygen content (water),
real-time monitoring and reporting,
surface water quality,
suspended material (water),
water chemistry,
water column reflectivity,
water pH,
water properties,
water quality,
water sampling,
water sampling,
water temperature, Fewer tags
|
The dataset documents the spatial and temporal variability of nutrients, phytoplankton, and related water quality parameters at high spatial resolution in the Sacramento-San Joaquin River Delta and Suisun Bay of California, USA. The dataset includes nitrate, ammonium, orthophosphate, dissolved organic carbon, temperature, conductivity, dissolved oxygen, and chlorophyll as well as information about phytoplankton community composition. Data were collected under different environmental/flow conditions in June, July, August, and October of 2020, and May, July, and October of 2021. The data release consists of a .xml document, and .txt and shapefile documents. Descriptions for each document and file are listed in the...
Categories: Data;
Tags: Aquatic Biology,
California,
Central Valley,
Ecology,
Geochemistry, All tags...
Hydrology,
Liberty Island,
Sacramento River,
Sacramento-San Joaquin Delta,
Suisun Bay,
USGS Science Data Catalog (SDC),
United States,
Water Quality,
Water Resources,
biogeochemistry,
biota,
delta,
drinking water use,
environment,
high frequency,
high-resolution,
hydrogeology,
inlandWaters,
nutrient content (water),
nutrients,
phytoplankton,
public supply water use,
real-time,
statistical analysis,
visualization methods,
water quality,
water quality, Fewer tags
|
Northeast SJV (NESJV), Southeast SJV (SESJV), Western SJV (WSJV), and Southern SJV (SSJV). These regions were primarily defined from the California Department of Water Resources SJV groundwater subbasins (CDWR, 2003); minor modifications were made to the CDWR defined subbasin boundaries to optimize separation of groundwater derived from the Sierra Nevada to the east and from the Coast Ranges to the west under predevelopment conditions. Each region was divided into equal-area grid cells, ranging from 280 km2 in the SESJV to 984 km2 in the SSJV, for a total of 88 cells. These cell sizes were the minimum sizes in each region for which 60% of the cells in the region would contain at least 1 well with full major ion...
Types: Citation,
Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Agriculture,
California,
Central Valley, California,
Environment,
GAMA, All tags...
Geochemistry,
Geographic Information Systems,
Groundwater,
Hydrogeology,
Hydrology,
NAWQA,
PHREEQC,
Public Supply Water Use,
San Joaquin Valley, California,
Total Dissolved Solids (TDS),
Trends,
United States,
Water Quality, Fewer tags
|
View more...
|
