Inflow Locations and Magnitude Input Files to the Central Valley Hydrologic Model (CVHM)


This digital dataset contains the name and location for the inflows to the surface-water network for the Central Valley 
Hydrologic Model (CVHM).  The Central Valley encompasses an approximate 50,000-square-kilometer region of 
California. The complex hydrologic system of the Central Valley is simulated using the USGS numerical modeling 
code MODFLOW-FMP (Schmid and others, 2006b).  This simulation is referred to here as the CVHM (Faunt, 2009).  
Utilizing MODFLOW-FMP, the CVHM simulates groundwater and surface-water flow, irrigated agriculture, land 
subsidence, and other key processes in the Central Valley on a monthly basis from 1961-2003.  The total active 
modeled area is 20,334 square-miles.  The CVHM includes complex surface-water management processes.  The 
hydrology of the present-day Central Valley and the CVHM model are driven by surface-water deliveries and 
associated groundwater pumpage.  The Streamflow Routing Package (SFR1) is linked to MODFLOW-FMP to 
facilitate the simulated conveyance of surface-water deliveries. If surface-water deliveries do not meet the farm 
delivery requirement, the FMP invokes simulated groundwater pumping to meet the demand.  The surface-water
 network represents a subset of the entire stream network in the valley.  Even so, it covers about 3,000 kilometers 
of surface-water and is simulated using 208 stream segments that represent 2244 stream reaches, with 43 inflows 
and 66 diversion locations providing 64 routed and 41 non-routed deliveries.  Most of these inflows are regulated by 
dams and most of the deliveries are conveyed through an extensive canal network.  The routed deliveries are 
conveyed through the simulated surface-water network, while the non-routed delivery conveyance typically occurs 
through small canals or diversion ditches and are not directly simulated. Much of the surface-water diversion and 
delivery information was compiled by the California Department of Water Resources (DWR) for 21 water-balance 
subregions (WBSs) covering the valley floor (C. Brush, California Department of Water Resources, written commun., 
February 21, 2007).  The CVHM is the most recent regional-scale model of the Central Valley developed by the U.S. 
Geological Survey (USGS).  The CVHM was developed as part of the USGS Groundwater Resources Program 
(see "Foreword", Chapter A, page iii, for details).

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Organization: Water Data Partners