DOEE identified intelligent retention as an important option for limiting wet-weather discharge, storing water on-site for use, and informing future improvements to District infrastructure.
OptiNimbus was deployed for intelligent retention and rainwater harvesting at two DC-area fire stations. OptiNimbus results in effective stormwater capture for use in truck washing and refilling day-tanks, and dramatic reductions in wet-weather discharge. In addition, these installations were a test-drive of technologies with high potential to improve other District stormwater infrastructure. OptiNimbus enabled the dual use of stormwater capture volume for on-site use and wet-weather flow reduction. Optimizing the performance of water storage volumes is particularly valuable in highly space constrained urban settings. OptiNimbus dramatically increased the return on investment of the installed harvesting systems.
Brooklyn Botanic Garden sought a comprehensive site water harvesting and recirculation system to maintain its landscape, water features, and special tree and plant species while minimizing impacts on the environment by reducing wet-weather discharge.
OptiNimbus preemptively releases water from the lower Water Garden Pond to create stormwater storage volume ahead of forecasted storm events. This significantly reduces the incidence and volume of wet-weather discharge while maintaining aesthetics and achieving water conservation goals. OptiNimbus saved Brooklyn Botanic Garden hundreds of thousands of dollars in capital costs for new water storage infrastructure.
The USEPA and General Service Administration upgraded an existing 6,000-gallon capacity rainwater harvesting system at the USEPA headquarters to minimize wet-weather discharge while maintaining water availability for irrigation.
OptiNimbus was incorporated into the rainwater harvesting system, providing the forecast-based logic necessary to discharge water in advance of rain events. This provides the USEPA with the flexibility to maximize environmental benefits of their rainwater harvesting system and also meter, record, and monitor inputs and outputs of the cisterns over time. OptiNimbus for rainwater harvesting has improved the functionality of USEPA's existing cisterns by reducing wet-weather discharges and providing year-round irrigation. OptiNimbus significantly increased the return on investment for their rainwater harvesting system.
The City of St. Joseph needed high-value solutions to reduce combined sewer overflows as a component of a large program to address regulatory requirements. During the design and construction of a wetland park, intelligent stormwater infrastructure was chosen to attenuate peak flows and help reduce wet-weather flow to the combined sewer.
Opti provided the City of St. Joseph with its first intelligent stormwater control system. OptiNimbus controls the wetland park and is designed to reduce wet-weather flow by 85 percent. With OptiNimbus, the wetland park minimizes contributions from the subwatershed to combined sewer overflows.
The Twin Oaks branch of the Austin Public Library wanted to upgrade its existing rainwater harvesting system to improve its wet-weather performance.
Opti improved the existing rainwater harvesting system by retrofitting it with OptiNimbus. The intelligent system optimizes the collection of rainwater based on forecasted weather conditions, minimizes wet-weather discharge, and controls the onsite irrigation system. This results in potable water savings, improved utilization of the downstream water quality facilities, and improved wet-weather performance. OptiNimbus dramatically improved the function and return on investment of the existing rainwater harvesting system at the Twin Oaks Library.
An undersized wet pond outside of Portland needed intelligent flow control function and hydromodification for improvements to water quality.
Opti succeeded in both improving flow control function and water quality. This retrofit eliminated the need for increasing the size of the pond, which would have cost several orders of magnitude more than the retrofit and OptiNimbus.
One of the country's largest coal transfer facilities operated by a large multinational, required an intelligent rainwater harvesting system to reduce potable water use and help eliminate stormwater discharges.
OptiNimbus adds forecast-based intelligence to existing control systems, allowing stormwater to be used for on-site coal dust suppression. This results in reduced reliance on municipal water for use for dust suppression and optimizes stormwater management to help achieve the facility's zero stormwater discharge goals. OptiNimbus decreases annual operating costs and helps keep the facility in compliance with clean water act and state requirements.
A Fortune 500 corporation wanted to reduce wet-weather discharge and enhance environmental benefits of their existing flood irrigated green roof while maintaining functionality.
OptiNimbus maintains a forecast-based water level in the flood irrigated layer of the turfgrass green roof. The intelligent system allows the flood irrigation layer to be drawn down through evapotranspiration before forecasted rain events. This results in reductions in potable water use and decreased runoff impacts. This corporation was able to improve water conservation as well as decrease runoff during wet-weather by incorporating OptiNimbus.
The City of Omaha enlisted Opti to actively test the effectiveness of permeable pavements and real-time stormwater management as Best Management Practices.
Opti retrofitted the stormwater underdrain with an automatic valve connected to OptiNimbus, enabling intelligent stormwater detention for combined sewer overflow reduction and water conservation. Active stormwater management was shown to be a cost efficient Best Management Practice.
Denver Green School wanted an optimized rainwater harvesting system to eliminate wet-weather discharge and retain water for irrigation.
OptiNimbus was applied to a 3,000-gallon above-ground cistern collecting runoff from a 7,300 sq ft roof area, creating an optimized, advanced rainwater harvesting system. The system provided important research data, supplied water for irrigation, and also engaged young students with the future of green infrastructure technology.
NC State sought an optimized rainwater harvesting system to eliminate wet-weather discharge and retain water for irrigation.
Five interconnected 650-gallon cisterns collect runoff from a 2,950 sq ft roof area. The system has been functioning flawlessly for over four years. During Hurricane Sandy, it may have been the only piece of infrastructure that automatically prepared for the storm.
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