Location of diversions from the surface-water network of the Central Valley Hydrologic Model (CVHM)

This digital dataset contains the name and location for the diversions from 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, 2006).  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: Department of the Interior