The Tarrant Regional Water District (TRWD) of North Central Texas has earned an Envision Silver award for its Line J, Section 1 Pipeline project, a 2-mile, 108-inch diameter pipeline that delivers water to meet the growing future demands of more than 1.9 million people in North Central Texas.
Envision is a sustainable infrastructure rating system developed by the Institute for Sustainable Infrastructure. The Envision system measures sustainability in infrastructure projects through the measurement of five categories: Quality of Life, Leadership, Natural World, Resource Allocation, and Climate and Risk.
Designed by ISI charter member Freese and Nichols, Inc., the project earned the award based on contributions to the quality of life for communities in the area that have experienced drought conditions, as well as the stimulation of sustainable growth and development due to increased water demands in one of the fastest growing communities in the U.S.
Here is how the TRWD rated:
- Quality of Life: Water demands in Tarrant County are expected to double in the next 50 years, and area lakes have not been able to meet demands, leading to TRWD’s extensive water transmission system. The project improves the net quality of life for many of the communities served by TRWD by increasing their ability to transfer raw water to 1.9 million users.
- Leadership: TRWD began implementing sustainable practices prior to the project and the evaluation and implementation of sustainable practices had been a priority since the beginning of the pipeline project. Significant collaborative effort went into evaluating the use of trench excavated material for pipe embedment through the development of native controlled low-strength material (CLSM).
- Natural World: To maintain wetland and surface water functions, hydraulic studies and geomorphology studies were performed at Village Creek to complete the pipeline crossing under the creek and the surface restoration design. Two ecosystem functions are maintained by the Line J pipeline. Hydrologic connections are maintained and enhanced by restoring all contours to existing pre-construction contours at creek crossings. Sediment transport functions are maintained by removing materials deposited in the bottom of the creeks which impede the natural flow of the water carrying sediment.
- Resource Allocation: The design of the Line J Pipeline incorporates several initiatives to reduce excavated materials taken off site. The excavated soils will be used as pipe embedment, trench backfill, and borrow material to grade properties adjacent to the pipeline.
- Climate and Risk: TRWD has worked towards addressing water demand in a responsible way for many years. To the District, this means operating safely, minimizing the adverse impact on the environment, building infrastructure as the service area needs it, and building trust with the customer communities. Their infrastructure system, which includes Line J, is designed, operated, and maintained to be flexible and resilient to changing climate and social conditions.