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Scientific-Investigations Report 2011–5129

Prepared in cooperation with Jefferson County and the Washington State Department of Ecology

Hydrogeologic Framework, Groundwater Movement, and Water Budget in the Chimacum Creek Basin and Vicinity, Jefferson County, Washington

By Joseph L. Jones, Wendy B. Welch, Lonna M. Frans, and Theresa D. Olsen

Abstract

This report presents information used to characterize the groundwater flow system in the Chimacum Creek basin. It includes descriptions of the geology and hydrogeologic framework; groundwater recharge and discharge; groundwater levels and flow directions; seasonal fluctuations in groundwater level; interactions between aquifers and the surface-water system; and a groundwater budget. The study area covers 124 square miles in northeastern Jefferson County, Washington, and includes the Chimacum Creek basin, which drains an area of about 37 square miles. The area is underlain by a north-thickening sequence of unconsolidated glacial and interglacial deposits that overlie sedimentary and igneous bedrock units that crop out along the margins and western interior of the study area. Six hydrogeologic units consisting of unconsolidated aquifers and confining units, along with an underlying bedrock unit, were identified. A surficial hydrogeologic map was developed and used with well information from 187 drillers’ logs to construct 4 hydrogeologic sections, and maps showing the extent and thickness of the units. Natural recharge was estimated using precipitation–recharge relation regression equations developed for western Washington, and estimates were calculated for return flow from data on domestic indoor and outdoor use and irrigated agriculture. Results from synoptic streamflow measurements and water table elevations determined from monthly measurements at monitoring wells are presented and compared with those from a study conducted during 2002–03. A water budget was calculated comprising long-term average recharge, domestic public-supply withdrawals and return flow, self-supplied domestic withdrawals and return flow, and irrigated agricultural withdrawals and return flow.

First posted August 1, 2011

For additional information contact:
Director, Washington Water Science Center
U.S. Geological Survey
934 Broadway, Suite 300
Tacoma, Washington 98402
http://wa.water.usgs.gov

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Suggested citation:

Jones, J.L., Welch, W.B., Frans, L.M., and Olsen, T.D., 2011, Hydrogeologic framework, groundwater movement, and water budget in the Chimacum Creek basin and vicinity, Jefferson County, Washington: U.S. Geological Survey Scientific Investigations Report 2011–5129, 28 p.



Contents

Abstract

Introduction

Methods of Investigation

Hydrogeologic Framework

Groundwater Movement

Groundwater Budget

Summary

Acknowledgments

Selected References


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