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Scientific Investigations Report 2014–5052

Prepared in cooperation with Sonoma County Water Agency, City of Santa Rosa, City of Sebastopol, City of Rohnert Park, City of Cotati, Town of Windsor, County of Sonoma, and California American Water

Simulation of Groundwater and Surface-Water Resources of the Santa Rosa Plain Watershed, Sonoma County, California

Edited by Linda R. Woolfenden and Tracy Nishikawa

Thumbnail of and link to report PDF (19.9 MB)Executive Summary

Water managers in the Santa Rosa Plain face the challenge of meeting increasing water demand with a combination of Russian River water, which has uncertainties in its future availability; local groundwater resources; and ongoing and expanding recycled water and water from other conservation programs. To address this challenge, the U.S. Geological Survey, in cooperation with the Sonoma County Water Agency, the cities of Cotati, Rohnert Park, Santa Rosa, and Sebastopol, the town of Windsor, the California American Water Company, and the County of Sonoma, undertook development of a fully coupled groundwater and surface-water model to better understand and to help manage the hydrologic resources in the Santa Rosa Plain watershed.

The purpose of this report is to (1) describe the construction and calibration of the fully coupled groundwater and surface-water flow model for the Santa Rosa Plain watershed, referred to as the Santa Rosa Plain hydrologic model; (2) present results from simulation of the Santa Rosa Plain hydrologic model, including water budgets, recharge distributions, streamflow, and the effect of pumping on water-budget components; and (3) present the results from using the model to evaluate the potential hydrologic effects of climate change and variability without pumpage for water years 2011–99 and with projected pumpage for water years 2011–40.

First posted April 15, 2014

For additional information, contact:
Director, California Water Science Center
U.S. Geological Survey
6000 J Street, Placer Hall
Sacramento, CA 95819

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Suggested citation:

Woolfenden, L.R., and Nishikawa, Tracy, eds., 2014, Simulation of groundwater and surface-water resources of the Santa Rosa Plain watershed, Sonoma County, California: U.S. Geological Survey Scientific Investigations Report 2014–5052, 258 p.,

ISSN 2328-0328 (online)


Executive Summary

Chapter A. Introduction

Chapter B. Watershed-Component Model

Chapter C. Groundwater-Component Model

Chapter D. Santa Rosa Plain Hydrologic-Model Calibration

Chapter E. Santa Rosa Plain Hydrologic Model Results

Chapter F. Santa Rosa Plain Hydrologic Model Scenarios

Chapter G. Summary, Model Limitations, and Conclusions

Appendix 1. Supplemental Information

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