The project: IMEG served as the Prime Consultant on this capital improvements project to increase peak flow storage and improve peak flow management strategies.

The goal: The City aimed to realize full treatment capabilities of the Central Wastewater Treatment Plant.

Scope of work: The project includes the addition of a new Peak Flow Basin (PFB) D to provide the plant with 175 million gallons of additional storage to handle max peak events. A new Return Peak Flow Pump Station (RPFPS) returns stored flow back to the Dallas treatment plant to give the plant full treatment capability by eliminating the current bottleneck of all stored flows being returned through the White Rock treatment plant via the 66-in PFB gravity drain. The 75 million galls per day (MGD) RPFPS sends return flows to Complex B activated sludge with options to return future stored flows to Complex A or to the Dallas headworks. PFB D peak flow water quality is highly clarified due to fill sequencing of the basins allowing for return flows to be taken directly to secondary clarification under post peak flow management conditions. This approach, which has been approved by Texas Commission on Environmental Quality, minimizes re-pumping energy when compared to the Integrated Power Services (IPS) or Water Resource Restoration Sponsor Program (WRRSP) depths, and avoids the cost and complexity of constructing new gravity drainage lines back to IPS along the toe of the USACE Trinity River levee.

The goal: The additional storage and pumping improvements made to the Central Wastewater Treatment Plant ensures the continued use of the facilities for years to come.