groundwater 101 groundwater impacts during drought nidis – middle acf meeting – may 18,2010
TRANSCRIPT
Groundwater 101Groundwater Impacts During DroughtNIDIS – Middle ACF Meeting – May 18,2010
Topics
Introduction – Questions about groundwater?
Recharge, Surface Water, Groundwater Interactions
Major Georgia Aquifers and Recharge Areas
Surface/groundwater interactions in varying geologic conditions
Groundwater level response to drought – recent examples
Conceptual Model of Groundwater Flow and Stream-Aquifer Interaction
Conceptual Model of Groundwater Flow and Stream-Aquifer Interaction
Source: USGS Circular 1139
Major Aquifers and Aquifer Systems
Piedmont Aquifer– Fracture Flow Dominated
Source: USGS OFR96-483
Middle ACF – Cretaceous Aquifer
Source: USGS OFR96-492
Lower ACF – Typical Floridan
Source: USGS OFR95-321
Georgia Groundwater Recharge Areas
Source: Georgia Geologic Survey
ACF Groundwater Recharge Areas
Source: Georgia Geologic Survey
Statewide Groundwater Monitoring Network, GA 2008
USGS Network About 180 continuously monitored wells (29 in real time) About 20 synoptic wells measured bimonthly
EPD is cooperator on 137 wells
Other cooperators include: City of Brunswick and Glynn County; Albany WG&L; City of
Lawrenceville; Lee County; Flint River Planning and Policy Center; and, McIntosh County
Groundwater Monitoring Network
Source: USGS Groundwater Watch
Online Data
Summary Statistics & Maps for Prior Yrs.
Source: USGS SIR 2009-5070
Surficial Aquifer
Source: USGS SIR 2009-5070
UFA: Southwestern Area
Source: USGS SIR 2009-5070
UFA: Southwestern Area (Albany)
Source: USGS SIR 2009-5070
Claiborne/Gordon Aquifer
Source: USGS SIR 2009-5070
Clayton Aquifer
Source: USGS SIR 2009-5070
Cretaceous Aquifer System
Source: USGS SIR 2009-5070
Crystalline-rock Aquifers
Source: USGS SIR 2009-5070
Conclusions
Almost all aquifers affected by drought during recent event Various factors contribute to drought response time in aquifer
Aquifer type Proximity to recharge areas Type of recharge and flowpath - “flashiness” of aquifer Compounding usage/issues (ag, municipal, over-usage, etc.) Water conservation/reuse
Recent drought showed rate of decline increased as drought progressed
Thank You - Questions?
For More Information Contact:
Joe Volpe
Golder Associates Inc.
Atlanta, GA
www.golder.com