This dissertation answers the general question of when and where consolidation of rural and medium size community water systems is appropriate and should be considered as a solution to address the growing water demands of a single critical community. To this end, a planning support system was developed, applied and consolidation recommendation were identified. This Planning Support System is applicable to urban fringe communities.
A two-module Planning Support System was developed: (1) Problem Analysis and (2) Solution Analysis. Problem Analysis consisted of using a Current Reality Tree to identify the core problem of a critical community: lack of a long-term water plan. The first sub-module accomplishes two tasks: selection and combining of individual community water systems to be included in the analysis. The combined systems were evaluated for their existing service characteristics and their ability to meet the critical community system's water needs. The second sub-module consisted of technical analysis of forecasted demands and needs analysis. The third module consisted of economic analysis of costs associated with consolidation.
The Planning Support System was applied to the City of Owasso (critical community). The Problem Analysis module identified the core problem of lack of long term planning for the critical community. The Solutions Analysis module combined four community water systems to address the core problem in the City of Owasso: the town of Collinsville, Rogers Rural Water System 3 and Washington Rural Water District 3. Each consolidation scenario was evaluated for their water treatment and storage capacities, as well as water permits for a 50-year planning horizon. The IWR-MAIN forecasting model forecasted the entire service area of the City of Owasso's water demands to increase by approximately 37 percent per decade for the 50-year planning period.
The Planning Support System for the City of Owasso recommended the schedule for consolidation, the required water rights, additional treatment capacity, and storage required. The net present costs were estimated for water treatment plant construction, storage and the O&M The most cost-effective consolidation scenario is the one that meets the City of Owasso's required future water demands at least cost. The least-cost consolidation scenario for the 50-year planning period was Rogers Rural Water District No. 3 with Washington Rural Water District No. 3 with a plant expansion in Rogers 3.