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East Fork Raw Water Supply Project

Complete

Seagoville, TX, USA

Project owner: Alan Plummer Associates


Project Overview
Project Name: East Fork Raw Water Supply Project
Date Completed: 2009
Location: Seagoville, Texas, United States
Project Status: Complete
Project Type: Water/Environmental

Project Tags: water water supply


Project Team

Disciplines That Worked on Project

Civil Engineer: Environmental (Stream / Waterbody restoration)Civil Engineer: Water (Drinking water treatment)Civil Engineer: Water (Water conveyance & pumping)

Awards & Media
Project Awards
Water Reuse Association 2008 Large Project of the Year 
National Association of Environmental Professionals: 2012 Environmental Stewardship Award - North Texas Municipal Water District and Alan Plummer Associates, Inc. 
Texas ACEC 2012 Engineering Excellence Gold Medal Award - Alan Plummer Associates 
North Central Texas Council of Governments 2013 Celebrating Leadership in Development Excellence (CLIDE) Award 

Media References
Project Details
About this project
This award-winning water supply project diverts an average of 91 million gallons per day (mgd) from the East Fork of the Trinity River, in Seagoville, Texas, and polishes it in one of the largest constructed wetlands in the county (2,000 acres). After passage through the wetlands, the water is pumped through an 84-inch diameter pipeline 44 miles north of the project to Lake Lavon for storage, blending, and water supply use. Representing the largest project in Texas using reclaimed water to augment a surface water supply source, the East Fork Raw Water Supply Project will provide the North Texas Municipal Water District (NTMWD) with over 102,000 acre-feet of water per year, enough water to serve a half million people.

The East Fork Raw Water Supply Project includes the following major components:
• Diversion pump station – This facility includes a river intake structure and pump station with the capacity to divert up to 165-mgd (peak) of water into the wetland.
• Constructed wetland – Situated on a footprint of approximately 2,000 acres, the constructed wetland includes three sedimentation basins and 24 wetland cells. The sedimentation basins are used for pretreatment of diverted river water prior to the constructed wetland. No chemicals are used to enhance particulate removal—only gravity settling. The wetland utilizes natural treatment mechanisms powered by sunlight, wind, plants, and microbes to further reduce suspended solids and dissolved constituents such as nitrogen and phosphorus that would otherwise impair the quality of the water in Lavon Lake if it were pumped directly from the river.
• Conveyance pump station and pipeline – This system includes an intake structure and pump station with the capacity to convey up to 150-mgd (peak) of wetland-treated water to Lavon Lake. The pipeline consists of 43.5 miles of 84-inch-diameter pipe running through Kaufman, Rockwall, and Collin Counties. It crosses two interstate highways and includes over a mile of combined tunnels.
• John Bunker Sands Wetland Center – Developed through a partnership between NTMWD and Rosewood Corporation, this facility provides opportunities for research, education, wildlife observation, and community gatherings within a modern, environmentally-conscious facility and grounds.

Alan Plummer Associates, Inc (APAI) provided engineering design and environmental consulting services for the project. APAI still provides operations support for this project through annual contracts. APAI staff is also involved in various support tasks.

Who benefits from this project, and how?
This project provides water to the people of North Texas. Since July 2009, almost 85 billion gallons of wetland-treated water have been conveyed to Lavon Lake for augmentation of NTMWD raw water supply. During 2010-2015 drought in North Texas, wetland-treated water represented about 18 percent of the total Lavon Lake raw water used by NTMWD.
Environmental considerations
In 2004, rapid growth within NTMWD’s service area created a critical raw water supply shortage. Existing plans for development of new surface water supplies could not be completed in time to meet the short-term demands. The East Fork Raw Water Supply Project was permitted, designed, constructed, and placed into operation within a period of five years, allowing NTMWD to continue its commitment of providing water for an ever-increasing human population while conserving the ecological integrity of our environment. The multiple benefits achieved with the constructed wetland system enable the partnership of NTMWD and Rosewood Corporation to achieve more efficient use of limited water supplies while protecting receiving waters, preserving green space, restoring habitat and increasing habitat diversity, reducing demand on fossil fuel energy consumption, sequestering carbon, and providing opportunities for public education and outreach.

The aquatic plans in the constructed wetland and plants naturally filter the water and remove sediment, heavy metals, and other pollutants. "This natural process removes about 95 percent of sediment, 80 percent of nitrogen and 65 percent of phosphorus. After being cleansed by the wetlands, the water is pumped through a 42-mile pipeline back to Lavon Lake, where it is blended and stored until it is sent to the Wylie Water Treatment Plant for treatment as drinking water. From there, it is distributed to homes and businesses across 10 North Texas counties." (source: https://www.ntmwd.com/east-fork-water-reuse-project)

This project replicates the yield of a new reservoir on less than one-tenth of the footprint needed for a reservoir.

The East Fork Raw Water Supply Project represents a sizable percentage of NTMWD’s overall raw water supply. The project not only delayed the need for the development of new surface water supply reservoirs but also created approximately 2,000 acres of wetland habitat. Over 250 different species of birds have been documented at the wetland.
What's unique about this project?
This project was the largest project in Texas using reclaimed water to augment a surface water supply source. The project was completed at a cost of less than 25% of developing a new reservoir and in about 20% of the time.

Funding & Costs
Project cost: $$$$$
Funding notes: Construction began in 2004 and was completed in 2009 at a cost of $280 million - significantly less than the cost of building a new reservoir.



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