NC DEQ-DWR Tar River Basin Model

Tar River Basin Model
Model Development Project Launch
The North Carolina Division of Water Resources has launched the hydrologic model development project for Tar River basin. The project kickoff meetings was held in Greenville, NC on July 15, 2010.

Need for a Hydrologic Model
The Tar-Pamlico basin covers 5571 square miles of drainage area entirely within North Carolina. The basin supplies water to the population of nearly 415,000 people residing in 16 counties within the basin.  Water use in the basin is almost evenly split between ground water and surface water sources.  The model will only cover the Tar River portion of the basin.

A computer model is a needed tool for evaluating surface water resources management in the basin.  For long term planning, the State can use the model in making regulatory decisions by evaluating potential impacts of proposed projects with significant water withdrawals within the basin as well as interbasin transfer permit applications.  Local units of government as well as the State can use the model to plan for increased water use due to growth, and to evaluate the effects of operational and regulatory constraints during a drought condition.

OASIS, a patented, mass balance, water resources simulation/optimization model will be developed for the Tar river basin. This basinwide model will use the finest practical geographic resolution and timestep.

Background Information
How can I stay informed on the development of the model?
Subscribe to the DWR-Tar-Pam stakeholders email list:  
If you have a comment or question on the Tar plan/model, please contact us at:
Final Model Update:
Prior Meetings:
July 7, 2011 Stakeholders Meeting
March 29, 2011 Stakeholders Meeting
July 15, 2010 Kick Off Meeting Information
EFDC Model
The Environmental Fluid Dynamics Code (EFDC) is a state-of-the-art hydrodynamic model that is used to simulate aquatic systems in one, two, and three dimensions.

EFDC Model Background Information
Greenville Utilities Commission (GUC) signed a resolution in July 2012 to participate in the HB 609 process and partner with the NCDWR for the development of water supply alternatives to support the next GUC WTP expansion.  GUC developed the EFDC model as part of the Tar River Flow Study.   NCDWR's current focus will be on potential salinity impacts to GUC's water supply, with upstream movement of the freshwater / saltwater interface, especially under critical drought periods.

EFDC Model Development Documents and Reports
If you would like access to the OASIS or EFDC model, Contact Charles Theobald ( or Neelufa Sarwar ( to request access to the model.