Water Supply Assessment

Water Supply Assessment (Final), January 2005

The various sections of the Water Supply Assessment are available for download individually in Adobe Acrobat PDF format:

Table of Contents
Executive Summary
Section 1: Introduction
Section 2: Service Area and Supplies

Section 3: Groundwater Supply Assessment

Section 4: City-wide Water Demands

Section 5: Sufficiency

Figures
Figure 1: Specific Plan Areas
Figure 2 (Location Map) and 3-1: Groundwater Basins and Subbasins, Vicinity of Rohnert Park, Sonoma County, California
Figure 3-3: Locations of Wells with Water Level or Water Quality Measurements
Figure 3-4: Geologic Map of Rohnert Park and Vicinity
Figure 3-5: Geologic Cross-Section A-A'
Figure 3-6: Geologic Cross-Section B-B'
Figure 3-7: Contours of Mean Annual Precipitation in Study Area
Figure 3-8: Annual Precipitation at Santa Rosa Gauge Water Year 1906-2003
Figure 3-9: Cumulative Departure from Mean Annual Precipitation at Santa Rosa Gauge
Figure 3-10: Total Annual Metered and Unmetered Pumpage in Study Area: 1970-2003
Figure 3-11: Location of Wells with Water Level Hydrographs
Figure 3-12: Groundwater Elevations in Shallow Well T06N/R08W-26L1 in City of Cotati
Figure 3-13: Groundwater Elevations in Shallow Wells, North and West of Rohnert Park
Figure 3-14: Groundwater Elevations in Shallow Wells, South and Southeast of Rohnert Park 
Figure 3-15: Groundwater Elevations in Shallow Wells, Petaluma Valley Groundwater Basin
Figure 3-16: Groundwater Elevations in Intermediate Zone, City Well RP-01 
Figure 3-17: Groundwater Elevations in Intermediate and Deeper Wells in Central Rohnert Park 
Figure 3-18: Groundwater Elevations in Intermediate and Deeper Wells in North and Northwest of Rohnert Park 
Figure 3-19: Groundwater Elevations in Paired Shallow and Intermediate/Deeper Wells in Rohnert Park 
Figure 3-20: Groundwater Elevations in Paired Shallow and Intermediate/Deeper Wells SCWA-01 and -03 
Figure 3-21: Spring 1951 Groundwater Elevation Contours, Prepared by Cardwell (1958) 
Figure 3-22: Spring 2004 Groundwater Elevation Contours for Shallow Wells in the Rohnert Park and Petaluma Area 
Figure 3-23: Spring 2004 Groundwater Elevation Contours for Intermediate/Deeper Wells in the Rohnert Park Area 
Figure 3-24: Maximum Nitrate Concentrations, Rohnert Park Area, January 2000 to March 2004
Figure 3-25: Nitrate Concentrations in City Wells 
Figure 3-26: Maximum Arsenic Concentrations in Rohnert Park Area, January 2000 to March 2004 
Figure 3-27: Leaking Underground Fuel Tank Locations, Cities of Rohnert Park and Cotati
Figure 3-28: Soil Permeability and Slope in Study Area
Figure 3-29: Recharge Potential Defined for WSA
Figure 3-30: Recharge Potential in Specific Plan Areas
Figure 3-31: PES Model Area and Recharge Potential Areas 
Figure 3-32: Annual Pumpage and Representative Groundwater Elevations in Central Rohnert Park Wells 
Figure 3-33: Historical, Current and Future Annual Groundwater Pumpage, City of Rohnert Park
Figure 3-34: Historical, Current and Future Annual Groundwater Pumpage with No Increase in Future Non-City Pumpage in Study Area 
Figure 3-35: Historical, Current and Future Annual Groundwater Pumpage with an Increase in Future Non-City Pumpage in Study Area

Tables
Table 3-1: Summary of Summary of Specific Capacities for City of Rohnert Park Wells
Table 3-2: Summary of Historical, Current and Future Groundwater Pumpage for the Study Area
Table 3-3: Summary of Groundwater Quality Data, City of Rohnert Park Wells
Table 3-4: Designation of Recharge Potential in Study Area Based on Soil Permeability and Slope
Table 3-5: Recharge Potential Designation in Specific Plan Areas
Table 3-6: Water Budget for Water Years 1987-2001 (Todd, 2004)
Table 3-7: Revised Water Budget for Water Years 1987-2001 (Modified from Todd, 2004)

Appendix A: Regional Geologic Setting and Previous Geologic Studies
Appendix B: Well Construction Information
Appendix C: Groundwater Level Hydrographs