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~ \ ''?' C02 0 71 ,~ ') \ , From.. -.}\~'v\. ~\\.\\.~'1 ~ 11 ~W\.6..... J PROJEC~ SUMMARY wATERSHED MAHAGEMEll'l' AND URBAN WAHR AND EHVIROIlMERTAL IIIFRASrRUCTURE SYSTEMS Urban water and environmental infrastructure systems (UWEISs) for water supply, wastewater, and stormwater management are vital to maintaining our future leading role in the world. Existing UWEISs were typically planned as part of a public sector watershed development whose objective was to tame our natural systems for the betterment of mankind. While this infrastructure has provided many significant benefits, it has also left a legacy of environmen- tal problems. During the past twenty years, a new environmental ethic has emerged. We now see very strong public opposition to virtually all of our supply augmentation methods and an insistence that we greatly improve our management of the demand for these services. Future UWEISs will emphasize real-time control of smart systems, demand management, multi-purpose design and operation, explicit treatment of risk, and use of sophisticated computer- based management systems. This proposal outlines a methodology for demon- strating that an integrated systems approach to the problem can significantly improve our ability to manage urban infrastructure as a subsystem of a water~ shed management program. The literature review demonstrates that such con- cepts have been espoused before but were never successfully demonstrated for urban areas. Part of the reason was the lack of computing resources that is no longer a problem. A key element of this proposal is to demonstrate the proof of concept using the Boulder Creek Watershed (BCW) and the City of Boulder as the case study. Boulder Creek Watershed (BCW) is an exceptional watershed to study urban infrastructure systems within a watershed context. It has a rich variety of infrastructure system problems and the local government and citi- zens have been very proactive in managing these problems. Consequently, a wealth of data and literature are available. Numerous cooperative studies with the city of Boulder and our group are underway. A major goal of this research is to develop new methods to evaluate the impact of watershed changes on UWEISs. These methods will be based on an integrated risk management framework with applications to design and opera- tion of sustainable UWEISs. During the first year of the project, a continu- ous simulation model with a one hour time step will be developed that will simulate the operation of the BCW and the city of Boulder UWEIS for calendar year 1996. This model will include surface-groundwater interactions. We will also simulate the behavior of the system for the major flood (1894) and drought (1954) of record. Existing models and databases will be used for this exercise. In addition, six specific studies will be undertaken to demonstrate how integration of these studies within a watershed framework will enhance their value. The six studies are: 1. Natural Disaster Manage- ment-Flooding, 2. Flood Forecasting System, 3. Impact of Urban Water Conser- vation on Evapo-transpiration, 4) Dynamic Water Quality Modeling, 5) Blending Water Supply Deliveries to Minimize Water Quality Changes in the Distribution system, and 6) Dynamic Simulation of the Performance of the Wastewater Treat- ment System during Periods of High Inflow. Following these initial efforts a workshop will be held to present the preliminary findings and to develop a research agenda for innovative ap- proaches to this important problem. Then, followup research will be conduct- ed. The total duration of the study is three years.