3 years ago

TECHNICAL AND INSTITUTIONAL ASPECTS OF SEWAGE EFFLUENT‐IRRIGATION WATER EXCHANGE, TUCSON REGION1

W. G. Matlock, K. J. Decook, C. B. Cluff

Abstract

ABSTRACT

.Many growing municipalities near irrigated agriculture are advocating a transfer of water now utilized for irrigation to municipal use. Alternatives are presented whereby this water can be transferred to municipal use in exchange for treated sewage effluent. The irrigation water would in effect be cycled through the municipal system prior to use on the farms.

A case study of the Tucson region illustrates the relevant legal, economic and technical aspects. Effluent could be delivered to irrigators in Avra Valley at a cost less than that now paid for water pumped from declining water tables. In return the City of Tucson could import ground water now being used for irrigation through an existing pipeline which presently cannot be used because of a court injunction obtained by the irrigators. It appears that such an exchange agreement could be made without modification of existing statutory law.

Similar exchange arrangements may prove to be feasible in other regions containing irrigated agriculture. Increased efficiency of water use can be achieved avoiding external effects which commonly arise in a direct transfer and are difficult to evaluate. High quality water is allocated to municipal use whereas nutrient‐rich sewage effluent is transferred to irrigation.

Publisher URL: https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1752-1688.1971.tb04984.x@10.1111/(ISSN)17521688.JAWRA55

DOI: 10.1111/j.1752-1688.1971.tb04984.x@10.1111/(ISSN)17521688.JAWRA55

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