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Open-File Report 2010–1154

Prepared in cooperation with Brunswick County, North Carolina

Summary and Statistical Analysis of Precipitation and Groundwater Data for Brunswick County, North Carolina, Water Year 2008

By Kristen Bukowski McSwain and A.G. Strickland

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ABSTRACT

Groundwater conditions in Brunswick County, North Carolina, have been monitored continuously since 2000 through the operation and maintenance of groundwater-level observation wells in the surficial, Castle Hayne, and Peedee aquifers of the North Atlantic Coastal Plain aquifer system. Groundwater-resource conditions for the Brunswick County area were evaluated by relating the normal range (25th to 75th percentile) monthly mean groundwater-level and precipitation data for water years 2001 to 2008 to median monthly mean groundwater levels and monthly sum of daily precipitation for water year 2008. Summaries of precipitation and groundwater conditions for the Brunswick County area and hydrographs and statistics of continuous groundwater levels collected during the 2008 water year are presented in this report. Groundwater levels varied by aquifer and geographic location within Brunswick County, but were influenced by drought conditions and groundwater withdrawals. Water levels were normal in two of the eight observation wells and below normal in the remaining six wells. Seasonal Kendall trend analysis performed on more than 9 years of monthly mean groundwater-level data collected in an observation well located within the Brunswick County well field indicated there is a strong downward trend, with water levels declining at a rate of about 2.2 feet per year.

First posted August 17, 2010

For additional information contact:
Director, North Carolina Water Science Center
3916 Sunset Ridge Road
Raleigh, NC 27607
http://nc.water.usgs.gov/

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Suggested citation:

McSwain, K.B., and Strickland, A.G., 2010, Summary and statistical analysis of precipitation and groundwater data for Brunswick County, North Carolina, Water Year 2008: U.S. Geological Survey Open-File Report 2010–1154, 42 p.



Contents

Abstract

Introduction

Cooperative Water-Resources Program

Groundwater-Resources Activities

Precipitation

Groundwater-Resources Conditions

Groundwater Levels

Long-Term Water-Level Trends

Summary

References

Appendix. Groundwater-level hydrographs for selected wells, Brunswick County, North Carolina, Water Year 2008


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