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Engineers describe hydraulics, materials and spill risks for Skowhegan Whitewater Park
Summary
Merrick Whitewater engineers explained the wave-shaper’s hydraulic system, materials and maintenance expectations, noting the system uses food-grade vegetable oil, stainless components and debris-management design; board members pressed on flood and sewer-outfall interactions.
Engineers from Merrick Whitewater gave a technical briefing of the Whitewater Park design and answered detailed questions from Planning Board members about hydraulics, materials and environmental risks.
Dan Shea, Merrick's product manager, said the hydraulic system uses a food-grade vegetable oil and estimated a small reservoir capacity: "The the oil that we use, the hydraulic fluid that we use in this system is it's a it's a basically a food grade vegetable oil," Shea said, adding the system would contain a modest volume (roughly 10–20 gallons to charge the cylinders plus a small reservoir). He said leaks would typically be observable as a vegetable-oil sheen near the hydraulic vaults and could be managed as part of Main Street’s operation and maintenance program.
On durability, engineers described 304 stainless-steel panels with heavy-duty rubber coatings and noted experience at installations such as Boise Whitewater Park. "I've not seen a panel bend," an engineer said while explaining that sediment accumulation under gates, rather than panel failure, is the common maintenance issue observed. Board members also raised concerns about a sanitary sewer outfall upstream of the site; engineers said the existing system is combined and that sanitary discharge into the river typically occurs only during extreme storm overflow events, which would also coincide with times the park would not be in use.
