• Hydraulic Modeling for Capital Improvements Planning

      Davis, Stephen E.; Tucson Water (Arizona-Nevada Academy of Science, 1980-04-12)
      The Tucson Water Department has developed a long-range water master plan utilizing a computerized hydraulic modeling system from which to determine size and phasing of major water capital improvements. Alternative water sources and amounts were modeled under a fifty-year peak demand condition. Nodal pressure, pipeline headloss, and reservoir drawdown results were evaluated against pre -set standards to determine the optimal solution to the supply- demand balance. A mid-range demand condition for 1990 was modeled subsequent to the modeling of the 2030 planning horizon to incorporate a major domestic water source change. Sizing of new facilities will he based upon the long-range solution. Phasing of capital improvements will he based upon existing system deficiencies, rate and spatial distribution of growth, delivery date of new imported surface supply, and the availability of funds for water project construction.
    • Impacts of a New Water Resources Management Plan for Tucson, Arizona

      Johnson, R. Bruce; Tucson Water (Arizona-Nevada Academy of Science, 1980-04-12)
      Major events during the summer of 1974 led to the beginning of a new, progressive program of water resources management for the City of Tucson. Critical supply shortages during the 1974 peak demand period brought into sharp community focus the need to reassess the previously existing philosophy of meeting continually increasing demand for water with extensive capital construction. An analysis of the impacts resultant from unmanaged peak demands, increased water level declines, potential land surface subsidence, projected increased operational costs and changes in water quality led staff and consultants to formulate and recommend the "Beat the Peak" program. A new philosophy on basin -wide groundwater withdrawals was implemented along with additional programs designed to evaluate the effect of our continued dependence on local groundwater sources. The results of this new management approach have been impressive. Per capita water consumption has been voluntarily reduced, total groundwater pumpage has been reduced and the potential for land surface subsidence is being actively evaluated resulting in direct benefits to Tucson Water and the customers it serves.
    • The Northwest Area Water Plan - Tucson, Arizona

      McLean, Thomas M.; Tucson Water (Arizona-Nevada Academy of Science, 1980-04-12)
      In May, 1979, the City of Tucson entered into contractual agreements with three private water companies to ensure 100 year adequacy and to manage scarce water resources within a large area northwest of Tucson. These agreements implemented the Northwest Area Water Plan. The Northwest Area Water Plan provides a mechanism by which local and imported water sources can be cooperatively managed by the City of Tucson and local private water companies within the Northwest Water Service Area. This plan has been developed to complement agreements for water service between the City of Tucson and private water companies and is an integral part of those agreements. The purpose of this plan is to identify those facilities and associated costs which provide, on a regional basis, a permanent, cost-effective water supply to new customers within the Northwest Water Service Area. The basic plan approach is to utilize existing local groundwater to the fullest extent possible while maintaining local water tables at their present levels. This will be accomplished through the planning, design, and construction of an import water supply system to meet the base demands of customers within the Northwest Water Service Area and the conjunctive management of local well capacity and storage reservoirs to meet the variable peak demands and fire flow requirements.