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This item was digitized as part of the Million Books Project led by Carnegie Mellon University and supported by grants from the National Science Foundation (NSF). Cornell University coordinated the participation of land-grant and agricultural libraries in providing historical agricultural information for the digitization project; the University of Arizona Libraries, the College of Agriculture and Life Sciences, and the Office of Arid Lands Studies collaborated in the selection and provision of material for the digitization project.

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No description available.

Introduction: The Office of Arid Lands Studies (OALS), the Water Resources Research Center (WRRC), of the University of Arizona, and the Arizona Water Commission (AWC) have developed a generalized data storage and retrieval system on the DEC-10 computer system at the University of Arizona for systematic reporting of water information (quality and quantity) within the State of Arizona. The objective of the on-line system is to expand the AWC's efficiency in answering routine questions regarding Arizona's water resources easily and on short notice through remote terminal access to hydrologic information. Currently, two files reside on AWIS whereby water-related information can be extracted for the entire State on either quarter- township basis or regionally by drainage basin. AWC is given authority to "collect and investigate information upon and prepare and devise means and plans for the development, conservation, and utilization of all waterways, watersheds, subterranean waters, groundwater basins and water resources in the State. . ." To this end, AWC is developing a State Water Plan, and the data residing on the two files in AWLS are part of the Plan's first phase--an inventory of the resource, current uses and associated problems as presented in Arizona Water Commission Report "Arizona State Water Plan, Inventory of Resources and Uses, Phase I, July, 1975."

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United States Army Corps of Engineers, Los Angeles District, Tucson Urban Study, Eastern Pima County, Regional Water Supply Element / Final Report / The Feasibility of Utilizing Remote Sources of Water to Augment the Natural Supply of the Tucson Area, Pima County Arizona / DACW09-79-M-1223 / April 1980

No description available.

No description available.

The traditional water-supply planning problem is characterized by two main steps: (1) project future water requirements based on present rates of economic growth, 'and (2) schedule water development projects to be introduced into the system on time to meet these predicted requirements. If alternative projects are thought to exist, the one thought to cost the least amount is selected. As project costs rise and actual new water availabilities become less, there is a growing awareness that more new water is not necessarily the only answer. Increased efficiency in water use through conservation, reuse, transfer to less consumptive and higher valued applications, and improved management techniques are becoming practical alternatives. These alternatives lead to a need for a restatement of water-supply planning objectives in more precise forms than have heretofore been put forth. The various water- supply planning objective functions including the traditional one are all expressions which maximize the difference between gains and los se s involved with water development. They can be expressed mathematically and differentiated on the basis of how these gains and losses are defined. In the traditional sense, gains derived from meeting projected requirements are assumed to be infinite, and losses are taken to be actual project costs; therefore, maximization of net gains is accomplished by minimizing project costs and gains do not even have to be expressed. Consideration of alternatives, however, requires that gains be expressed quantitatively as benefits to individuals, communities, or regions, i. e. , primary, secondary, or tertiary benefits. The same thing holds for the expression of total costs. An objective function used to express the water-supply problem in the Tucson Basin, Arizona, considers gains as cash revenue to a hypothetical central water-control agency which sells water to the users within the basin. Losses are considered as marginal costs to the agency for producing, treating, and distributing water. The concept of economic demand is used to estimate the amount of water that municipal, agricultural, and industrial users will purchase at different prices. The possible sources of supply considered are groundwater from within the basin, groundwater from the neighboring Avra Valley Basin, reclaimed waste water, and Central Arizona Project water from the Colorado River. Constraints are formulated in order to determine optimal allocations of water under different conditions. The model used is referred to as a pricing model and is optimized by first decomposing the objective function into component parts, each part representing terms involving only one source of water. Then in instances involving inequality constraints, quadratic programming is used. In other instances where equality constraints or unconstrained conditions exist, Lagrangian multipliers and the calculus are used. The se latter conditions arise when it is determined at which point certain constraints become inactive. In the completely general case, this type of decomposition is not possible, but it appears that in many specific uses objective functions of this nature can be profitably decomposed. and optima determined much more conveniently than otherwise possible.