MODFLOW-OWHM used to characterize the flow system of the Petaluma River Watershed, Sonoma County, California
The Petaluma Valley integrated hydrologic model (PVIHM) was developed by the U.S. Geological Survey (USGS) 
in cooperation with the Sonoma County Water Agency and the City of Petaluma. The PVIHM simulates the 
99,000-acre Petaluma valley watershed and includes 54,000 acres where groundwater flow is active. The model …