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The stream network simulated in C2VSimFG consists of 4,634 stream nodes that make up 110 stream reaches. The stream nodes correspond to groundwater node locations where simulated streams exist. Each stream node is used to define physical properties of the stream including, depth-flow rating tables, stream bottom elevations, streambed thickness, streambed conductance, and wetted perimeter. Stream nodes are also where calculations are performed during a simulation, where diversions, stream inflows, and bypasses can occur within the model. C2VSimFG simulates streamflow of the key components of the river system, including the upstream inflows, diversions, return flows, bypasses, and stream-aquifer interaction at every stream node to generate the water budgets.
The data set is used as the C2VSimFG observed subsidence data to compare with the simulated subsidence data to evaluate the impact on subsidence, groundwater budgets, and groundwater levels. The subsidence affects stream-aquifer interactions and the decline in groundwater storage due to compaction in the San Joaquin Valley and Tulare Lake Basin. The data contains observed subsidence data over time from the DWR and USGS stations, USGS InSAR RestoreSJR GPS stations, USGS Extensometers, and the Continuous UNAVCO PBO GPS dataset. Most of the observed subsidence data was monitored with almost daily intervals. The GPS Surveys by USGS InSAR RestoreSJR monitoring subsidence stations were monitored biannually. The DWR continuous effort in the subsidence monitoring is part of the Sacramento Valley Subsidence Network, consisting of over 300 monument locations with an average spacing of 4.3 miles, encompassing 11 counties.
The stream reaches represent sections of simulated streams where similar hydrologic conditions exist. The stream network simulated in C2VSimFG consists of 110 stream reaches. Stream reaches may represent an entire stream, parts of a stream between tributary confluences, or location of interest along the stream. Stream reaches are made up of sets of stream nodes and follow the stream course as closely as possible to capture surface drainage patterns.
The C2VSimFG model elements are grouped into 21 subregions to facilitate data entry and reporting of model results. The subregion can be further grouped by: subregion 1 to 7 representing the Sacramento Valley, subregion 10 to 13 representing the San Joaquin River, subregion 14 to 21 representing the Tulare Lake Basin, and subregion 8 and 9 representing the streams tributary to the Sacramento - San Joaquin Delta and the Delta, respectively. The subregions are based on the portions of the Depletion Study Areas (DSAs) within the model boundary. The DSA's were originally developed by the Department of Water Resources' Division of Planning. The areas calculated for this data using the WGS 1984 Web Mercator projection may not reflect the actual areas used in the C2VSimFG model.
There is a total of 32, 537 elements within the C2VSimFG model, which make-up the finite grid mesh of the model. The elements are subdivided into 21 subregions. Each element is composed of corresponding groundwater nodes within the model domain. The model domain area is 20, 742 square miles, and each element is roughly 407 acres. The boundaries of the model grid were developed using a set of control points at important locations of the model area. The finite element mesh was created using GIS and several Excel and FORTRAN utilities. The grid size was refined in areas of higher groundwater gradient and/or areas that are more critical from hydrogeological viewpoints. The grid lines are designed parallel to the streamflow direction, when possible, as well as the groundwater streamlines, to capture the surface and subsurface drainage patterns. Nine major faults in the Central Valley are represented by thin strip of elements of around 500 feet. The dataset excludes three geologic outcrops: Sutter Buttes, Kettleman Hills and Capay Valley Hills, which are areas not included in the Bulletin 118. The dataset is maintained by the Sustainable Groundwater Management Office, Modeling and Tools Support Section. The areas calculated for this data using the WGS 1984 Web Mercator projection may not reflect the actual areas used in the C2VSimFG model.
The boundary dataset covers the model domain of the C2VSimFG. The total area of the model domain is 20,742 square miles. It contains 32,537 elements, which make up the model grid of the C2VSimFG. The boundary includes three hydrologic regions: Sacramento Region, San Joaquin River Region and the Tulare Lake Region, which have distinctively, different hydrologic and geologic settings. The model boundary is based on the Bulletin 118 - 2003 basin boundaries generalized for the model node spacing.