|Ground Water Emergency Order Update
Date: May 8, 2014
Notice from DNR Office of Conservation, Commissioner James Welsh
On August 19, 2011, the Office of Conservation declared a temporary ground water emergency for two areas of South Caddo Parish due to exceptional drought conditions resulting in higher than normal withdrawal of ground water without sufficient offsetting aquifer recharge. These conditions resulted in ground water levels in the Carrizo-Wilcox and Upland Terrace aquifers dropping to levels which caused several shallower water wells in the two areas to go dry at the end of July 2011.
To prevent further water level decline and reduce stress on the aquifers in these two areas, the agency ordered water conservation measures and ground water use restrictions. Details are provided in the August 2011 Memorandum and Emergency Order No. ENV-2011-GW014.
Since issuance of the Emergency Order, Conservation staff has continued to monitor hydrologic data in the region provided to our agency courtesy of the LSU Shreveport Red River Watershed Management Institute and from the United States Geological Survey (USGS) starting in September 2011. Water level data collected from the LSU-Shreveport monitoring wells located in the Areas of Interest indicate that water levels have shown recovery in all wells since June 2012.
Water level data from additional observation wells measured and reported by the United States Geological Survey (USGS) from November 2011 through May 2014 generally reports near similar conditions as seen with the LSU-Shreveport monitor wells, i.e., water levels gradually receded through August 2012 from their respective high water level marks recorded in April 2012, with a gradual increasing trend through March 2013 before a substantial decline through September 2013 during an extended drought. Results of USGS observation well water levels can be viewed below. Water well levels have continued to show an increasing trend to date in 2014 with all wells above the levels originally measured in 2011.
U. S. Drought Monitor Reports for Louisiana dated April 29, 2014 reported conditions in the areas to be "Normal". The current U.S. Drought Monitor Report for Louisiana may be viewed here.
The Louisiana Office of State Climatology rainfall data for the area south of Shreveport indicates monthly rainfall totals that are mostly average from the end of 2013 and start of 2014, although the past threww months have fallen below respective averages.
Since November 2011 to present, measured rainfall in the area is trending nearly consistent with the same monthly average trend shown on the graph at the link provided below.
In summary, rainfall and groundwater levels have declined during the June, July and August months and rebounded slowly during September and October 2013. Based on hydrologic and groundwater level results reported and evaluated during the past 18 months, the increase in groundwater levels throughout the areas of interest during January and February 2013 was expected as evidenced by similar conditions and data results reported during last winter. As also evident with past data, in the absence of any significant abnormal environmental condition(s), groundwater levels are expected to again decrease during the spring and summer. This cyclical water level rise and fall, or seasonal variation, is normal for aquifer systems such as the Carrizo-Wilcox and Upland Terrace where the volumetric groundwater use is dominated by public supply and domestic purposes. Considering aquifer characteristics and predominate use, water consumption generally trends upward during months with greater hours of daylight and warmer temperatures compared with months with fewer daylight hours and cooler temperatures. The greatest uncertainty for the area is the amount of rainfall, or lack thereof, hence the possibility of the return of drought conditions in the region. Considering that rainfall averages during the past three months have fallen below respective averages, the agency has determined that all restrictions and conditions set forth in the Emergency Order shall remain in full effect.