Intelligent Stormwater Management at the Gardner Avenue Detention Facility
City of Kansas City, MO
Kansas City, MO
The City of Kansas City, Missouri (KCMO) is the most connected and biggest smart city in North America, and the City’s sewer system provides a key foundation for Smart City initiatives. KCMO is emerging as a leader in developing smart solutions for the city’s combined sewer overflows (CSOs), which are estimated to total 6.4 billion gallons of overflow each year. To meet federally mandated mitigation requirements under the Clean Water Act, KCMO has implemented a 25-year, $4.5 billion Smart Sewer program. In 2016, KCMO issued a $1 billion Smart Infrastructure Challenge to find and implement strategic and sustainable solutions which will provide $1 billion in savings over the next 10 years.
One way in which KCMO is working toward its billion-dollar challenge is by utilizing Opti technology for intelligent stormwater management. KCMO has installed OptiNimbus at an existing 1.1 million-gallon dry detention pond located at Gardner Avenue within city limits. The discharges from this facility connect directly to the city's combined sewer system, which has limited capacity. At the Gardner Avenue facility, the objective is to provide a consistent post-storm retention time to control release of stormwater runoff to the combined sewer system. In advance of wet weather, the actuated valve closes, capturing stormwater runoff in the pond. After a storm event, the runoff is retained in the pond for a specified retention period, then gradually released downstream. With Opti, KCMO is able to directly reduce CSOs and cost-effectively meet its federal obligations.
For more information on this project, please see this case study.
Installed in April 2017, the Opti-enabled system at Gardner Avenue was found to have prevented 98% of wet weather flow in the watershed over a 9-month performance analysis period. A passive system, in comparison, would have prevented just 41% of wet weather flow over the same analysis period. This project is also expected to contribute towards Kansas City’s goal of reducing the cost of the Smart Sewer Program by almost $1 billion over the 25-year period. In the first year, the City estimates the cost per gallon managed at $0.0195 per gallon or measured in cost per control acre at $330 per acre. In year two and beyond, the City estimates the cost per gallon managed to be $0.0045 per gallon or measured in cost per control acre at $80 per acre. For Kansas City, the CMAC solution has produced an incredible value, as some other storage solutions range in price from $3.50 to $8 per gallon or more.
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Burns & McDonnell