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Commission presses for hydraulic model and cost estimate before approving major developments
Summary
Members said a full hydraulic model is needed to evaluate large proposed developments and any interbasin-transfer or volume-permit requests; commissioners asked staff to obtain cost and timing information and said developers may need to pay if model findings affect required infrastructure.
Townsend Water Commission members used the master plan discussion on July 13 to emphasize the need for a hydraulic model that would show how large subdivisions and proposed connections would affect system hydraulics and allow staff to test loop connections, tank additions and other changes before permitting development.
Chair Todd Melanson described the master plan as a "living document" but said the commission needs a clearer picture of the cost and timeline for producing and running a full hydraulic model. "I would like to have Lou here to talk either, you know, digitally or here in person so we can talk about what the cost would look like for a full hydraulic model," Melanson said. Members debated whether developers should pay for modeling: some argued that if the model identifies required infrastructure changes, developers should cover the model cost; Melanson asked for town counsel's opinion on the matter.
Commissioners also discussed permit implications: Melanson noted the state will require a model before granting an interbasin transfer or additional volume permit. Staff described the distinction between legal permitted volumes and physical pumping capacity and reported an average pump rate of roughly 0.4–0.5 (against a 0.75 registered/permitted figure) while noting the system's physical pumping limits.
Why it matters: A hydraulic model will be necessary to evaluate system impacts of planned development, to support permit applications, and to avoid making incremental network changes without a broader system view. Commissioners asked staff to obtain cost estimates and defendant counsel guidance before pursuing a contractual engagement for modeling services.
Next steps: Staff to solicit cost and scope proposals from model providers, present estimates to the commission in the fall, and request a legal opinion on whether developers can be required to pay for modeling when it affects required infrastructure.
