Hydro valves included in latest version of Bentley modeling software

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• Vortex Valves' flow control capabilities in PondPack V8i offer engineers expanded options in detention pond design

PORTLAND, ME, Dec. 7, 2009 -- Hydro International, a leading provider of environmentally sustainable products and innovative solutions that control and treat stormwater, wastewater and combined sewer overflows, today announced that its Reg-U-Flo® Vortex Valves are modeled into the new version of Bentley Systems' PondPack® detention pond design and urban hydrology modeling software. Bentley is the leading company dedicated to providing comprehensive software solutions for the infrastructure that sustains the world.

PondPack software allows engineers to analyze, design, manage and plan detention pond projects. The latest version, PondPack V8i, was released this past summer.

Hydro's Reg-U-Flo Vortex Valve is a self-activating device that uses vortex principles to control and attenuate stormwater flow and other liquid streams without the need for moving parts or external power requirements. Its hydraulic vortex action chokes back peak flows far more effectively than other valves and conventional flow control devices such as orifice plates, which have much smaller outlet openings (apertures). This significantly minimizes the chance of blockages and reduces upstream stormwater detention volumes by up to 40 percent.

In previous versions of PondPack, engineers were able to model flow control applications using orifice plates and other conventional flow controls. With PondPack V8i engineers now have an expanded flow-control modeling capability that includes the Hydro vortex valves' unique performance.

"PondPack has proven itself as a standard bearer in the field of detention pond analysis and design," said Lisa Glennon, Product Manager for Hydro's Stormwater Business. "We're thrilled that engineers will be able to utilize the Reg-U-Flo tools in the PondPack software package to determine the right flow control options for each individual project."

"We pride ourselves on providing the most comprehensive detention pond analysis software available," said Malcolm Sharkey, Bentley product manager for stormwater products. "We're confident engineers will find solid value in the new features we have added from Hydro International and other highly respected stormwater systems providers."

About Hydro International
Hydro International plc is a global supplier of environmentally sustainable products and innovative solutions that control and treat stormwater, wastewater and combined sewer overflows, utilizing award-winning advanced vortex and complementary technologies. Hydro International's US Stormwater operation, based in Portland, Maine, is the leading provider of products designed to effectively treat and control the flow of stormwater runoff. Hydro International also has US Wet Weather operations based in Portland, Maine, US Wastewater operations based in Hillsboro, Oregon, and international offices in Dublin, Ireland, and Clevedon and Ely in the U.K. The company is a public company listed on the London Stock Exchange.

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