2011 Transmission and Supply Plan
The Cascade Water Alliance is made up of eight cities and water districts that work together to provide a safe and reliable water supply for the 370,000 residents within their combined service areas. It includes the Cities of Bellevue, Kirkland, Redmond, Issaquah, and Tukwila plus three special districts serving portions of King County, Washington.
HDR has provided a range of planning and engineering services for Cascade over the past decade. The most recent of these is an updated Transmission and Supply Plan (TSP) that included a 50-year water demand forecast for the Cascade service area; an update of Cascade's water conservation assessment; and the evaluation of a range of water supply alternatives that compared supply quantities, costs, environmental impacts, reliability and risks. The TSP provides a basis for Cascade's long-term water supply portfolio and related capital investments.