Glades Reservoir Environmental Impact Statement (EIS)

Transcription

1 Glades Reservoir Environmental Impact Statement (EIS) Permit Application #SAS Public Scoping Meeting Proposed Operational Plan/Scenarios March 2012 Glades Reservoir Environmental Impact Statement

2 Proposed Project Location March 2012 Glades Reservoir Environmental Impact Statement

3 Project Location The proposed project Would be located entirely within Hall County, Georgia Would supply water to Hall County through the year 2060

4 4 Project Location Location: North of Lake Lanier, in the very northern tip of the Apalachicola- Chattahoochee-Flint (ACF) River Basin. Drainage Basin: Approximately 1.9% of the total ACF River Basin.

5 Proposed Project Elements March 2012 Glades Reservoir Environmental Impact Statement

6 6 Overview The US Army Corps of Engineers (USACE) is evaluating this proposal in an environmental impact statement (EIS) as part of the permit application process. No permit decisions have been made by the USACE concerning this proposed project.

7 7 Overview The proposed project includes the following: One (1) pumped-storage reservoir on Flat Creek Two (2) pump stations Approximately 94,000 feet of transmission pipelines

8 Proposed Project Components 1. A proposed pumpedstorage reservoir: Normal pool water surface elevation at 1180 ft above mean sea level (msl) Usable capacity of 11.7 billion gallons 850-acre surface area

9 2. A raw water intake and Proposed Project Components pumping station for withdrawing water from the Chattahoochee River

10 Proposed Project Components 3. Approximately 13 miles of transmission pipeline from the pumping station at the Chattahoochee River to the existing Cedar Creek Reservoir

11 11 Proposed Project Components 4. A raw water intake and pumping station at the proposed Glades Reservoir

12 Proposed Project Components 5. Approximately 4.5 miles of pipeline from the pumping station at the Chattahoochee River to the Glades Reservoir

13 Proposed Operational Plan March 2012 Glades Reservoir Environmental Impact Statement

14 Proposed Operational Plan The proposed Glades Reservoir would store: Water pumped from the Chattahoochee River, as well as Natural stream flow from Flat Creek.

15 Proposed Operational Plan The proposed Glades Reservoir would: Operate as a flow augmentation facility to supplement minimum instream flows in the Chattahoochee River.

16 Proposed Operational Plan A pump station on the Chattahoochee River would be constructed to pump raw water: to the existing Cedar Creek Reservoir and to the proposed Glades Reservoir.

17 Proposed Operational Plan A second pump station would pump water from the proposed Glades Reservoir to the Chattahoochee River.

18 Proposed Operational Plan Water pumped from the Glades Reservoir would be discharged at a location just downstream of the Chattahoochee River Pump Station.

19 Proposed Operational Scenarios March 2012 Glades Reservoir Environmental Impact Statement

20 Proposed Operational Scenarios When river flows are plentiful, water would be pumped from the Chattahoochee River to the existing Cedar Creek Reservoir for treatment and distribution. The pumping rate would range from 0 to approximately 86 million gallons per day (mgd).

21 Proposed Operational Scenarios A minimum flow in Flat Creek downstream of the proposed dam would be maintained at all times. The Applicant proposes a minimum flow of 3 mgd (equal to the annual 7Q10 low flow), or the natural inflow to the reservoir, whichever is less.

22 Proposed Operational Scenarios A minimum flow in the Chattahoochee River would be maintained at all times. The Applicant proposes to maintain a minimum flow of 119 mgd (equal to the annual 7Q10 low flow), or the natural inflow at the pump station location, whichever is less.

23 Proposed Operational Scenarios The Georgia EPD will evaluate the minimum flow requirements as part of the water withdrawal application review process. Minimum flows are required to protect aquatic habitat and downstream uses below water withdrawals.

24 Proposed Operational Scenarios Periods of high river flows: Pump water from the Chattahoochee River to fill or refill the Glades Reservoir when sufficient flow is available in the river after pumping to the Cedar Creek Reservoir.

25 Proposed Operational Scenarios Periods of average to moderate river flows in the Chattahoochee River: Streamflow is plentiful and minimum instream flows are maintained without pumping from the reservoir.

26 Proposed Operational Scenarios Periods of low river flows: Pump water from the proposed Glades Reservoir to the Chattahoochee River to maintain the required minimum instream flows.

27 Thank you for visiting this station. Our staff is available to assist you if you have any questions. March 2012 Glades Reservoir Environmental Impact Statement