Coastal Georgia Region Technical Information

In support of the Regional Plan Update, separate technical memoranda were developed on water and wastewater forecasting as well as a resource gap analysis.

Water and Wastewater Forecasting

Water and wastewater demand forecasts form the foundation for water planning in the Coastal Georgia Region and serve as the basis for the selection of water management practices. Forecasts are summarized within Section 4 of the Regional Water Plan, but additional detail can be found in the Water and Wastewater Forecasting Technical Memorandum.

Over the next 35 years, the population in the Coastal Georgia Region is projected to grow by 48%, increasing the demands for surface water and groundwater and increasing the quantity of wastewater generated. Total water withdrawals by municipal, industrial, agricultural, and energy sectors are projected to increase by 26% (71 million gallons per day (MGD)) from 2015 to 2050. Total wastewater flows are projected to increase by 23% (58 MGD) over the same period. 


Gap Analysis

The Gap Analysis Technical Memorandum compares the water and wastewater demand forecasts to the available resources. This material is also summarized within Section 5 of the Regional Water Plan. Areas where future demands exceed the estimated capacity of the source have a potential gap that may be addressed through water management practices. Potential water resource issues identified for the Coastal Georgia Region include:

  • At the regional level, for modeled aquifers, there is sufficient groundwater to meet forecasted needs over the planning horizon; however, meeting the increase in demands in areas where groundwater supplies may be limited due to salt water intrusion is a significant challenge.
  • Over the planning horizon, forecasted surface water demands within and outside the region are projected to exceed the available resources at locations in the region.
  • Water quality conditions indicate the potential need for improved wastewater treatment within the Ogeechee, Altamaha, River basins.
  • Addressing non-point sources of pollution and existing water quality impairments should be a part of addressing the region’s future needs.