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By 2020, the Trinity River Authority of Texas (TRA) Central Regional Wastewater System (CRWS) plant is expected to face peak flows that are 45% greater than the current peak flow of 405 mgd. When evaluating the plant's influent facilities, it became clear that TRA could not risk long lead times and schedule delays that could result from typical design-bid-build procurement methods. AECOM recommended pre-purchasing equipment as a part of three separate, consecutive construction contracts at the influent structures of the CRWS plant.The equipment was purchased within budget and installed within aggressive timelines. These examples of pre-purchasing show how an owner can innovatively procure equipment when the timeline requires it. The most important phrase to remember is, "coordination is key". Whether you are looking to accelerate a project schedule, minimize uncertainty that comes with traditional procurement, or have increased control of cost and equipment selection, pre-construction purchasing may be your solution.

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When confronted with increasing peaking factors and excessive wet weather flows, many utilities are faced with the decision of whether to expand existing treatment facilities, build high rate blended flow facilities specific to wet weather treatment, provide storage for wet weather flow management, or both. The Trinity River Authority selected a treatment and storage approach to wet weather management. As part of this program, a concrete-lined storage basin was constructed with preliminary treatment and multiple diversion and return capabilities to store flows in excess of what can be hydraulically processed through the facility. As a peak flows subside, the stored flows can be returned to several points in the process for treatment. Combined, all the components of the peak flow management system are termed the On-Site Storage System and provide a robust and flexible facility to manage not only the peak wet weather flows but also to provide diversion capabilities during emergencies and shutdowns.