From the Proceedings of the 1977 Meetings of the Arizona Section - American Water Resources Assn. and the Hydrology Section - Arizona Academy of Science - April 15-16, 1977, Las Vegas, Nevada / Relative water content (RWC), water potential (P), and gas exchange were measured on saltcedar at the Bernardo, New Mexico, lysimeter site. RWC and s were closely correlated; but, water potential measurements, taken with a pressure bomb, were more convenient and reliable. RWC and r decreased sharply from sunup until about 0900, when minimum values of about -26 bars T or 80% RWC were reached. Water status then remained constant or improved slightly through late afternoon. Transpiration rates typically remained high until about noon and then began a steady, gradual decrease that continued throughout the afternoon. The data suggest that water stress may be a factor in initiating stomatal closure; however, transpiration continued to decline despite a constant or improved leaf water status. Maximum net photosynthetic rates occurred by 0900, and depressions throughout the remainder of the day were largely accounted for by increased leaf temperatures. Afternoon depressions in transpiration and photosynthesis occurred in twigs held at constant temperature and relative humidity, suggesting that a diurnal rhythm may be involved in control of gas exchange. Water status of plants growing on the lysimeters was comparable to that of plants in adjacent natural stands; gas exchange rates were slightly higher for the lysimeter-grown plants.

I norra Storstockholm produceras och distribueras dricksvatten av kommunalförbundet Norrvatten. Under värmeböljan sommaren år 2018 ökade dricksvattenförbrukningen bland medlemskommunerna till en sådan hög nivå att Norrvattens tillgängliga kapacitet för dricksvattenproduktion riskerade att inte räcka till. En bidragande orsak till detta, antogs vara att en stor del av den ökade vattenförbrukningen gick till bevattning och fyllande av pooler. Det är ett behov som Norrvattens verksamhet inte är dimensionerad för att hantera. I takt med dagens växande befolkning i Norrvattens medlemskommuner och en hotande global uppvärmning, förväntas risken för kapacitetsbrist tillta. Således var syftet med detta arbete att studera hur behov av vatten för bevattning och fyllande av pooler kan tillgodoses på ett långsiktigt hållbart sätt bland Norrvattens medlemskommuner utifrån de tre hållbarhetsdimensionerna. Med hjälp av litteraturstudier, intervjuer och beräkningsmodeller identifierades alternativa lösningar och effektiviseringsmöjligheter gällande tillgodoseendet av vattenbehov för bevattning och poolfyllning. Dessutom genomfördes en stickprovsundersökning med syftet att studera socioekonomiska faktorer, vid eventuell implementering av de identifierade alternativa lösningarna och effektiviseringsmöjligheterna i Norrvattens medlemskommuner. Därefter applicerades en kvantitativ analys på det erhållna dataunderlaget med väldefinierade statistiska metoder för konfidensintervall och hypotesprövningar på signifikansnivån 5 %. Resultatet visade flertalet alternativa lösningar och effektiviseringsmöjligheter var passande att implementera för att tillgodose behov av vatten för bevattning och fyllande av pooler bland Norrvattens medlemskommuner. Det berodde på en stor välvilja gentemot såväl miljön som Norrvattens verksamhet. Mer konkret identifierades en utbredd vilja att förändra konsumtionsbeteenden gällande vattenanvändning för bevattning och fyllande av pooler. Som en följd fanns också en villighet att betala mindre summor för alternativa lösningar och effektiviseringsmöjligheter för att tillgodose sådana vattenbehov. Dock påvisades även en utbredd motvillighet till kraftiga ökningar i priser och kostnader för knippade med vattentjänster, varpå mer kostsamma alternativa lösningar uteslöts som långsiktigt hållbara utifrån socioekonomiska hållbarhetsperspektiv. Därmed rekommenderades Norrvatten att fortsätta planera för utbyggnation av sin produktionskapacitet, eftersom de identifierade alternativa lösningarna och effektiviseringsmöjligheterna inte ansågs tillräckliga för att nollställa behov av dricksvatten producerat av Norrvatten för bevattning och fyllande av pooler. Samtidigt drogs slutsatsen att behovet av utbyggd kapacitet skulle kunna reduceras vid implementering av de identifierade lösningarna och effektiviseringsmöjligheterna. Dock kunde inte det reducerade behovet beskrivas i kvantitativa termer med den applicerade arbetsmetodiken. Således rekommenderades Norrvatten att i framtiden arbeten genomföra en kartläggning av detta, i syfte att erhålla värdefullt beslutsunderlag kring storlek på utbyggd produktionskapacitet. / In the northern part of Greater Stockholm, drinking water is produced and distributed by the municipal association Norrvatten. During the height of the summer 2018, drinking water consumption among the member municipalities increased to such an extent that the available production capacity was nearly insufficient. This was assumed to be due to major increases in drinking water consumption for garden irrigation and filling of pools, which are water needs that the production capacity is not dimensioned to handle. Furthermore, the risk of production capacity shortage is assumed to increase in the near future due to population growth and global warming. The purpose of this thesis was to examine possible approaches to supply the need for water for garden irrigation and filling of pools among the member municipalities of Norrvatten in a long-term sustainable manner with regard to the three sustainable dimensions. Based on literature studies, interviews and theoretical models, alternative solutions and efficiency opportunities of supplying water needs for garden irrigation and filling of pools was identified. A sample survey was also conducted with the aim of studying socio-economic factors regarding a potential implementation of the identified alternative solutions and efficiency opportunities among the member municipalities. Subsequently, quantitative analysis was applied to the obtained data with well-defined statistical methods for confidence intervals and hypothesis tests at the significancelevel of 5 %. The result illustrated implementable alternative solutions and efficiency opportunities of supplyingwater needs for garden irrigation and filling of pools. It was due to a large benevolence towards the environment and Norrvatten’s operations. More specifically, a widespread willingness to change consumption behaviours regarding water utilization for garden irrigation and filling of pools was identified. As a consequence, there was also a great willingness to pay smaller sums for alternative solutions and efficiency opportunities of supplying such water needs. However, a widespread reluctance to larger costs associated with water services was also identified, whereby costly alternative solutions were excluded as long-term sustainable from a socio-economic perspective. Due to this, Norrvatten was recommended to continue planning for an expansion of its production capacity, with regard to the conclusion that the identified alternative solutions and efficiency opportunities were not considered sufficient to completely reduce the need for drinking water produced by Norrvatten for garden irrigation and filling of pools. Nevertheless, it was also concluded that the need for expanded capacity could be reduced when implementing the identified solutions and efficiency opportunities. However, the reduced need could not be described in quantitative terms with the chosen methodology. Because of that reason, Norrvatten was recommended to examine this further in future projects considering that it would provide a valuable basis for operation decisions regarding expanded production capacity.

From the Proceedings of the 1972 Meetings of the Arizona Section - American Water Resources Assn. and the Hydrology Section - Arizona Academy of Science - May 5-6, 1972, Prescott, Arizona / The little chino valley in central Arizona presents an interesting groundwater study as withdrawals exceed recharge. The groundwater surface is falling at about 2 feet per year over most of the area due to large irrigation development. A shallow water table aquifer overlies the artesian aquifer and receives recharge from irrigation runoff. Water quality in the artesian aquifer is excellent. Water quality in the water-table aquifer is poorer, being somewhat higher in total salts, but is suitable for most domestic and agricultural uses. Specific yield for the supply area to the artesian aquifer is 12 percent, with estimated annual recharge of 4000 acre feet and leakage from the aquifer of 2300 acre feet. Water budget and use for the basin is presented with water level and water quality data. The multiphase aquifer system is described and illustrated.

From the Proceedings of the 1972 Meetings of the Arizona Section - American Water Resources Assn. and the Hydrology Section - Arizona Academy of Science - May 5-6, 1972, Prescott, Arizona / Water information systems may have different demands, such as responding to queries about rainfall-runoff relationships, water level data, water quality data and water use. Data required for retrieval may need display, such as a hydrograph. Information systems are reviewed and results of specific water information agencies are reported. Agencies in Arizona are listed with their specific water information need. Development of a water activity file and water information system is outlined for Arizona as a pilot project. Linkage of units within the data system is shown, as is the information system's questionnaire to project leaders. Information currently in the system includes water quality from the state department of health for 450 wells in the Tucson basin, and water level, storage, storage coefficient and transmissivity supplied by the Arizona water commission for the Tucson basin and Avra Valley. Quality of data submitted to the system should be reflected in retrieval for better understanding of the data. This consideration is planned for the coming fiscal year.

From the Proceedings of the 1974 Meetings of the Arizona Section - American Water Resources Assn. and the Hydrology Section - Arizona Academy of Science - April 19-20, 1974, Flagstaff, Arizona / A progressive and coordinated effort is underway to provide a sound technical basis for managing water resources on forest and rangelands in the Southwest. An in-house Forest Service (USDA) research program including pilot testing and economic evaluations of multiple-use alternatives provides information necessary for this purpose. Demands for other goods and services also are increasing on these lands in the face of a burgeoning population. homeseekers, vacationers, and recreationists seek a variety of recreational. experiences that require open space and a relatively undisturbed environment. Frequently these uses conflict, and the combined pressure from too many activities can damage the environment. A new research effort has been organized in the central and southern Rocky Mountain Region to cope with these problems. Nine Western universities including Northern Arizona University, Arizona State University, and University of Arizona have joined forces with the Rocky Mountain Forest and Range Experiment Station to form the Eisenhower Consortium for Western Environmental Forestry Research. Simply stated, the consortium seeks to better our understanding of the relationships between man and his open-space environment in order that its quality might be maintained.

From the Proceedings of the 1974 Meetings of the Arizona Section - American Water Resources Assn. and the Hydrology Section - Arizona Academy of Science - April 19-20, 1974, Flagstaff, Arizona / A proposed desalting plant is an engineering solution to the effects of a problem which could have been avoided and even now could be reduced on the farm. Water costing $125 per acre-foot will be delivered to Mexico to grow wheat, cotton, garden crops, alfalfa and safflower, of which the average value added per acre-foot was estimated at $80 for cotton and garden crops and $14 for wheat, alfalfa and safflower. The U.S. government, instead of building the desalting complex, could accomplish its purpose just as well by paying each farmer in the Yuma area, in return for the farmers reducing their drainage flow by whatever method they see fit, $114 per acre per year for the next 50 years. With proper management on the farm, the costs of managing salinity need not be high.

From the Proceedings of the 1974 Meetings of the Arizona Section - American Water Resources Assn. and the Hydrology Section - Arizona Academy of Science - April 19-20, 1974, Flagstaff, Arizona / A summary is given of interrelated, technical and institutional events concerning the Colorado River which took place between the United States and Mexico from 1849 to 1974 with emphasis on the 1961-1974 period. Until the treaty of 1944, Mexico had had no guarantee of a specific annual quantity of water, but in the years after 1945, when a guarantee of 1.5 million acre-feet per year was established, more than that amount was available for use. Salinity problems arose, and in 1965 an agreement for a 5-year plan for alleviating the technical and political difficulties surrounding the salinity question was made. In 1973 it was agreed that the United States would build, within approximately 5 years, a facility for desalting the saline drainage water entering Mexico. Fulfillment of the technical provisions for this agreement requires, in any event, the timely provision of federal funds to construct and operate the physical works. The several states should receive assurance that their rights and those of their respective water users will not be impaired within the legal operation of the agreement.

From the Proceedings of the 1974 Meetings of the Arizona Section - American Water Resources Assn. and the Hydrology Section - Arizona Academy of Science - April 19-20, 1974, Flagstaff, Arizona / A plan for the reuse of sewage effluent is proposed for the city of Tucson, Arizona. Several kinds of use would be possible, but utilization for irrigation of existing farmland in the Avra-Marana area seems particularly attractive for several reasons: (1) conveyance can be accomplished by gravity flow, (2) no tertiary treatment is required for the presently grown crops, (3) the nutrients in the effluent would be better used, and (4) effluent use would reduce the pumpage of high quality groundwater, conserving it for municipal or other uses. An exchange of wastewater for groundwater for use in the city system is seen as a good alternative to the present practice of the city purchasing farmland in Avra valley in order to acquire the groundwater for conveyance to the Tucson basin. Objectives to maximize the quantity and efficiency of wastewater use may not appear compatible with the profit maximization motive of the individual farmer, and suitable provisions will have to be written into wastewater sales agreements to assure coordination between user and supplier.

From the Proceedings of the 1974 Meetings of the Arizona Section - American Water Resources Assn. and the Hydrology Section - Arizona Academy of Science - April 19-20, 1974, Flagstaff, Arizona / Four sources of water supply for desert cities are rainfall, runoff, groundwater, and imported water, and the potential use for each varies. The government can institute various policy changes to eliminate or reduce the imbalance between water supply and demand. Restrictions should be placed on water-use luxuries such as swimming pools, subdivision lakes, fountains, etc. Water pricing should be progressive; each unit of increased use above a reasonable minimum should be charged for at an increasing rate. Runoff from individual properties, homes, storage, and supermarkets should be minimized through the use of onsite recharge wells, and various collection methods should be initiated. A campaign to acquaint the general public with a new water policy must be inaugurated.

From the Proceedings of the 1974 Meetings of the Arizona Section - American Water Resources Assn. and the Hydrology Section - Arizona Academy of Science - April 19-20, 1974, Flagstaff, Arizona / In the lower reaches of the Colorado River, damages from the increase in salinity to U.S. water users are now estimated to be about 53 million dollars per year and will increase to about 124 million dollars per year by the year 2000 if no salinity control measures are taken. Physical, legal, economic, and institutional aspects of the salinity problem and proposed actions to mesh salinity control with a total water management plan for the basin are discussed. A scheme is presented for planning under the Colorado River water quality improvement program. Recent legislative action is also discussed which provides control plans to improve the water quality delivered to Mexico as well as upper basin water users. These efforts now under study will assure the continued, full utility of Colorado River water to U.S. users and Mexico. However, more extensive development of the basin's natural resources puts new emphasis on total resources management through improved water and land use planning to conserve a most precious western resource - water.