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Georgia Water Resources Institute
Georgia Water Resources Institute
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ItemSeeking a Better Set of Operation in the ACF Basin - What Do the Performance Measures Tell Us?(Georgia Institute of Technology, 2013-04) Zeng, Wei ; Wen, Menghong ; Regan, JeffreyThe Apalachicola-Chattahoochee-Flint (ACF) Basin has been under various versions of the Interim Operation Plan (IOP) since 2006. The latest revision (RIOP) was released in May 2012, with the U.S. Fish and Wildlife Service's Biological Opinion (BiOp) supporting it. Through the history of the RIOP and various versions of the BiOp's, performance measures for the different bilogical aspects have become better defined and understood. This development makes it possible to tailor the operations and target the specific performance measures to enhance biological and other performances. Georgia EPD has cooperated with external technical experts to test alternative operations in the ACF Basin. Preliminary results seem to be promising.
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ItemUsing the USGS Dougherty Plain Groundwater Model for Ensemble Analysis(Georgia Institute of Technology, 2011-04) Wen, Menghong ; Liang, Hailian ; Zeng, WeiUp to this point, the USGS Dougherty Plain groundwater model has been used primarily to analyze the impact of groundwater irrigation on reduction of groundwater discharge into surface water stream flow. The original hydrologic conditions used in model were based on 2001 dry year data. In this study, additional dry year conditions, 2007, were developed. Effects of the same seasonal groundwater irrigation on stream flow reduction and stream-aquifer flow under 2007 and 2001 dry conditions were simulated and compared. It is found that stream flow reductions under 2007 and 2001 dry conditions are very close on a 10-month average basis and on a monthly basis, while the net flow discharges from the Floridan Aquifer to the streams are different. The net flow discharges are more sensitive to the changes in the modeled hydrologic conditions than stream flow reductions do. Upon data availability, changing the model inputs or boundary conditions can result in a host of potential responses from groundwater aquifers and surface water streams. This may in turn provide more insight when the model is used to advise water resource planning and management.
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ItemUncertainty Analysis of Unimpaired Flow and Monthly 7Q10(Georgia Institute of Technology, 2011-04) Jiang, Feng ; Liang, Hailian ; Zeng, WeiThe basic hydrologic inputs to the surface water availability assessment of Statewide Water Management Plan, unimpaired flow (UIF) and monthly 7Q10, were developed with USGS flow data, water use data, reservoir operation data, etc. Uncertainties exist in all these input data and are propagated into the resulting UIF and monthly 7Q10 through the development process. The magnitude of uncertainty in all input data was determined and the amount of uncertainty in each step of the development process was analyzed. Monte Carlo simulations were conducted to quantify the uncertainty in all input data and resulting UIF and monthly 7Q10. Our initial analyses indicate that the amount of uncertainty in both development of the UIF data and the development of monthly 7Q10’s is very small, and has no significant influence on modeling results of surface water availability assessment. The largest uncertainty in UIF and 7Q10 was contributed by stream flow data filling process.
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ItemRamp down Rate in the Revised Interim Operation Plan: Is Mother Nature Too Harsh on the Endangered Mussels in the Apalachicola River?(Georgia Institute of Technology, 2011-04) Zeng, Wei ; Zhang, YiA careful review of the pre-impoundment data shows that much of the natural ramp down rate at the receding limb of peaking flow events would be “outlawed” or not allowed by provisions of the Revised Interim Operation Plan – the operational guidance of the Army Corps of Engineers in its operation of the Apalachicola-Chattahoochee-Flint River Basin. This begs the question of whether it is in the interest of the endangered animals for the Corps to provide something that even Mother Natural could not provide.
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ItemSurface Water Availability Resource Assessment in Georgia State Water Plan Efforts – Lessons Learned(Georgia Institute of Technology, 2011-04) Zeng, WeiOver the past two and half years, Georgia’s surface water resources assessment team devoted a tremendous amount of effort in developing unimpaired flow data, water resources modeling tools, and approaches in assessing available resources for the State Water Planning process. Georgia’s surface water resource assessment team includes Georgia Environmental Protection Division (EPD) and its major surface water resource assessment contractors, ARCADIS, Riverside Technology, and Georgia Water Resources Institute. Much has been done and learned through the process resource assessment as well as data and tool preparation. We would like to share the experiences with our peers and seek improvements in the next round of work.
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ItemA Real Test for the Georgia Drought Management Plan - Drought Indicators at Work and Georgia’s Response to the 2006-2008 Drought(Georgia Institute of Technology, 2011-04) Zeng, Wei ; Kim, InchulGeorgia Drought Management Plan (Drought Plan), which was approved by Georgia Department of Natural Resources Board On March 26, 2003, experienced the first comprehensive test by the 2006-2008 drought. Signs of drought conditions first appeared in the spring of 2006. With the exception of a short period of relatively healthy precipitation in the fall of 2006, hydrologic conditions deteriorated in the next year and half, reaching a height in late 2007. The impacts of the drought lingered on through 2008 and early 2009, before heavy precipitation ended this dry period. Georgia Environmental Protection Division has been monitoring the drought indicators prescribed by the Drought Plan. A suite of measures was put in place as responses to lessen the impacts of the drought. Conditions in 2010 seem to resemble those in 2006, raising the potential that another dry period is down the road.