Catawba-Wateree Water Supply Study

Catawba-Wateree Water Supply Study, Duke Power | SC & NC, US
Catawba-Wateree Water Supply Study, Duke Power | SC & NC, US
Duke Power
North Carolina & South Carolina, USA

The Catawba-Wateree Water Supply Study is one of many studies planned as part of the project re-licensing, and will be supervised by a Study Team. The Team comprises representatives of Duke Power, the North and South Carolina resource agencies and the water supply utilities located throughout the Catawba-Wateree River basin. It operates as part of the Catawba-Wateree Hydro Operations and the Water Quantity Resource Committee, which provides technical oversight to several related studies.

We were selected to compile and analyze the available data concerning current and future withdrawals and discharges in the Catawba-Wateree Basin; examine and quantify the impacts of the 1998-2002 drought; and estimate the safe yield for water supplies for a long-term planning period (50 years). Future efforts beyond the initial phase of the study will include basin-wide water supply planning and the development of a drought management structure.

The objective of this study is to document the current water withdrawals and discharges in those portions of the Catawba-Wateree Basin that most affect the operation of the project. It also serves to estimate future water withdrawals and discharges based on reasonable growth projections. The information concerning projected water withdrawals developed in the study will be used to evaluate proposed changes to hydroelectric operations and in the development of a Low Inflow Protocol (LIP) that will be the basis for future operation of the project during periods of low inflow. Duke Power's reservoir operations model will be used to evaluate the impact of existing and future water withdrawals on reservoir operations under various stakeholder-derived scenarios.

The study also will consider how changes in project operations will impact the safe yield of its reservoirs for public water supply - especially during low inflow periods - and develop consistent drought contingency actions needed for water users to support an LIP for the project. Additionally, it will provide for water user input into Duke Power's decision on a potential impact fee structure for water withdrawals and identify opportunities for improved water quantity and/or quality management that could be at least partially supported with funds from future impact fees.

Unique Features

  • Develop model of current and future withdrawals and discharges into the Catawba River
  • Examine impacts of drought
  • Develop Low Inflow Protocol and Drought Management Plan