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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.

Project Completion Report, Office of Water Resources Research Project A-047-ARIZ / Period of Investigation: July 1973 - June 1974 / The work upon which this report is based was supported by funds provided by the United States Department of the Interior, Office of Water Resources Research, as authorized under the Water Resources Research Act of 1964. / A means of referencing various entities along a given stream course is the river mile index. This gives the location relative to the coordinate geometry of the river system. This type of referencing is very useful to a number of agencies both within the State and at higher levels. Detailed map coverage of the State has not been available until recently with the production of 7-1/2 minute orthophoto maps of the entire State of Arizona. Since these maps were produced from imagery obtained during 1972-73, the State has a fairly definite point in time with which the maps were produced. The existing U. S. Geological Survey maps varied by up to 50 years in their generation. A scheme was worked out and six orthophoto maps were annotated using that method for an area around Tucson, Arizona. The problem of developing a computer software package to produce river mile indices was begun but soon shown to be too vast in scope to accomplish all that was desired. Several existing similar programs were examined. The U. S. Environmental Protection Agency (EPA) has a program AUTOMAP which is designed to do all that was sought to be done and much more. The development of a small, crude, local computer program was abandoned. Linkage to the EPA program AUTOMAP was sought and will be effected soon. The enlargement of project scope and envolvement meant that the pilot project was absorbed into a now ongoing activity to digitize the main stream channels and ancillary data. This new enlarged project, with funding from other sources, should be completed this year. The OWRR project may be thought of as the seed of the large project now being conducted. Without the seed the present status would not have been realized.

The overall objectives of a study initiated in 1972 by the Water Resources Research Center (Univ. of Arizona), in cooperation with the Pima County Dept. of Sanitation, are to examine the possibility of interactions between recharged river water and deposits in adjoining landfills, and if such interactions occur to evaluate the effect on native groundwater quality. Corresponding to these objectives, the principal function of a monitoring program initiated during the project was to characterize background water levels and native groundwater quality during normal low flows (i.e., sewage flows) in the river, and to monitor changes, if such occur, during flood flows. As it turns out, data from the project should also be applicable to the anticipated irrigation of farmland near Marana, using effluent from the Impending Ina Rd Treatment Facility. In particular, clues will be provided on transformations in sewage effluent quality during infiltration and deep percolation. The first phase of the project was conducted at the Ina Rd landfill and the second involved both the Ina Rd and Ruthrauff Rd fills. Results of the first phase were reported in a paper by Wilson and Small. This report will review the results of the second study phase. Specific objectives of the studies during the second phase included (1) obtaining river water and well water samples for chemical and microbiological analysis, (2) monitoring water level changes in available wells and (3) characterizing general features of the geohydrology in the vicinity of the landfills.