Nashville Metro Water Services (MWS) operates the K.R. Harrington (KRH) Water Treatment Plant (WTP), a critical component of the City of Nashville’s drinking water supply system. Recent infrastructure investments at KRH include the completed Filter Rehabilitation project, which modernized the existing granular media filters to restore longer filter run times, increased filtration capacity from 90 MGD to 112 MGD, and stabilized plant operations while maintaining continuous treatment. Building on operational reliability and increased capacity achieved through the filter rehabilitation, MWS initiated the Hydraulic Improvements project to address hydraulic limitations upstream of the filters. The first step in the project was a hydraulic evaluation, which included development of a hydraulic model calibrated with survey data at multiple flow rates. The hydraulic model identified bottlenecks that were affecting treatment performance and efficiency. With the hydraulic model results, MWS decided to proceed with improvements that focused on extending the reliable service life of critical facilities for at least the next 15 years while improving operational flexibility and resilience. Key improvements are centered on the Raw Water Pumping Station, flocculating clarifiers, sludge pumping systems, electrical infrastructure, and HVAC systems. At the Raw Water Pumping Station, the project includes replacement of four (4) raw water pumps and motors with modern, high-efficiency units capable of operating over a wide range of flows while remaining within preferred operating conditions. These upgrades are intended to improve reliability, reduce vibration, and provide operational flexibility to meet system demands. Associated discharge piping improvements were evaluated through a comparison of full replacement versus rehabilitation using pressure-rated carbon fiber polymer liners to balance constructability, cost, and operational impacts. Improvements to the flocculating clarifiers focus on restoring hydraulic performance and structural integrity through replacement of tube settlers, resetting of launders and troughs to proper elevations, repair of concrete and leakage issues, and other miscellaneous repairs. Sludge handling upgrades include replacement of eight (8) sludge transfer pumps, upsizing of two (2) sludge sewer discharge pumps, installation of magnetic flow measurement downstream of sewer discharge pumps, and replacement of aging piping and valves to improve reliability and maintainability. Electrical upgrades, including new variable frequency drives (VFDs) and medium-voltage power and control wiring, support improved pump control, energy efficiency, and system resilience. A defining challenge of the project is implementing substantial upgrades to critical treatment infrastructure while maintaining uninterrupted plant operations. To address this, the project is being delivered using a phased design and early procurement strategy. Long-lead equipment, including raw water pumps and sludge pumps, is being advanced through early procurement packages in parallel with continued design development to reduce schedule risk and support construction sequencing that aligns with operational constraints. Together with the completed Filter Rehabilitation project, the KRH Hydraulic Improvements project represents a coordinated, system-wide investment strategy to modernize aging infrastructure, enhance hydraulic performance, and improve long-term operational reliability. Upon completion, these improvements will position KRH to reliably meet water supply demands while supporting MWS’s mission to provide safe, dependable drinking water to the Nashville metropolitan area.