Stream-gage locations where streamflow gains/losses were quantified along the Central Valley surface-water network

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, 2006b).  This simiulation 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