Monthly inflows to the surface-water network for the Central Valley Hydrologic Model (CVHM)

This digital dataset contains the monthly 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, 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