Innovation in CSO Reduction: Implementing Intelligent Distributed Infrastructure
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The need to control CSOs and meet requirements of stormwater Long-Term Control Plans (LTCPs) has led to innovative solutions with the potential for limiting CSOs and obviating system expansion while realizing benefits of water conservation.

With the advent of small, inexpensive hardware and the use of distributed software applications for stormwater management, the ability to design or retrofit detention structures that integrate predictive weather forecast data, real-time system information and software modeling has lead to powerful advances in the ability to control storm flow upstream, limiting or delaying the need for system expansion or upgrades while providing a secondary benefit to water supplies by utilizing stored water for harvesting applications. By integrating water harvesting applications with stormwater control infrastructure, flow reductions and water conservation can be realized in a single, cost effective solution. Appropriate for both retrofit and new construction, implementing harvesting systems that achieve both flow control and water conservation objectives provides a double win for communities needing to mitigate CSOs and the impacts of growth on water supplies. The application of conventional real-time and dynamic control and feedback systems is commonplace in industrial settings, water supply and treatment, wastewater treatment and conveyance, and Combined Sewer System management; however, the use of onsite dynamic control systems in sustainable stormwater management has been quite limited. The availability of a new breed of robust, extremely low cost, highly functional, internet accessible, programmable logic controller systems coupled with the ease of wired and wireless communications are making onsite real-time and dynamic controls viable options for both new construction as well as retrofits with green infrastructure based stormwater systems. These new approaches and recent advances in information technology infrastructure are delivering the necessary underlying foundations of a future of ubiquitous, digitally-connected, green infrastructure that will change the means and methods by which we understand and control our urban environments and impact natural systems. Through advances in harvesting system controller technology and innovative design concepts, real-time data acquisition and active control systems have emerged that allow for a project's harvesting system and stormwater infrastructure to be tightly integrated — allowing for reduced Combined Sewer Overflow events and maximizing the performance of the harvesting system. Controller logic and innovative server side application software provide the ability to operate autonomously on a single system or in concert with any number of advanced controllers, creating large-scale virtual stormwater control and water supply systems across an entire watershed. This is enabled by specialized server-side application software the Controller accesses via wired or wireless networks, and allows system operators, regulatory bodies, owners and end-users on-demand control, status and reporting capabilities. In addition, Microsoft's Sequel Server 2005 Data Mining Services runs within the server-side application's database engine, providing objectivist Bayesian interpretation of data steams fed by the controller and other external devices or systems for data correlation and prediction resolution. This paper will outline design techniques and controls technology required to realize the coupled benefits of fully integrated harvesting and stormwater control systems, and demonstrate the cost advantages of constructing single integrated systems versus traditional harvesting and stormwater control systems in series.

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Publication Summary

  • Geosyntec Authors: Philip C. Reidy
  • Title: Innovation in CSO Reduction: Implementing Intelligent Distributed Infrastructure
  • Event or Publication: Proceedings of the 2011 World Environmental & Water Resources Congress
  • Practice Areas: Water and Natural Resources Assessment, Management, and Restoration
  • Date: 2011
  • Location: Palm Springs, California