Title: TO GROW OR NOT TO GROW Abstract The Greenwood pressure zone within the City of Maryville’s distribution system has experienced rapid growth and, resultant water demands. Maryville hired LDA Engineering to develop a computerized hydraulic water model of their water distribution system and analyze operational scenarios to determine needed improvements to the distribution system. The Greenwood zone was one of the areas that the model indicated was lacking in storage during peak demand periods. Through the hydraulic evaluation key upgrades were recommended to improve service to the Greenwood area to account for peak demands, future growth, and expansion. Included were upgrades to an existing booster station, abandoning an existing water tank that had reached the end of its useful life, and constructing a new storage tank to operate in conjunction with a sister storage tank (Greenwood Tank). Recommended storage upgrades included the abandonment of the existing 200,000-gallon standpipe and construction of a new 2-million-gallon water tank to address peak demands and potential growth in this area and provide additional storage for domestic and fire-fighting uses. An existing booster station feeding this pressure zone also required upgrades to provide additional flow to the pressure zone to address the variations in demand. The New Greenwood Tank is located adjacent to the existing 1-million gallon tank Greenwood Tank. The new tank also included a mixing system to ensure water within the new tank meets drinking water standards. LDA evaluated the turnover ratios of both tanks during low and high demand periods to provide the City with recommended water level ranges during low and high demand times of the year. Challenges facing the tank construction included potential unsuitable soils underneath the tank footprint, keeping the existing tank in service during construction, and site piping design to allow the two tanks to operate in tandem. There are numerous benefits as well as challenges incorporating the distribution system upgrades into the expanding pressure zone. Key Takeaways: The attendees will hear about how multiple projects staged correctly continue improving the City of Maryville distribution system operation while addressing existing service concerns, planning for future growth, and maintaining water quality during various demand cycles.