From the Proceedings of the 1973 Meetings of the Arizona Section - American Water Resources Assn. and the Hydrology Section - Arizona Academy of Science - May 4-5, 1973, Tucson, Arizona / Hydrologic data collected from three small urban watersheds and one rural watershed were analyzed for the purpose of investigating the effect of urbanization on runoff. A procedure developed by the Soil Conservation Service was used to explain the relationship between the amount of rainfall and runoff. It was noted that the runoff curve number, a parameter of the method, increased as the percentage of impervious area increased. Also, there was evidence that a linear relationship existed between the runoff volume and its corresponding peak rate.

From the Proceedings of the 1975 Meetings of the Arizona Section - American Water Resources Assn. and the Hydrology Section - Arizona Academy of Science - April 11-12, 1975, Tempe, Arizona / The universal soil loss equation (USLE) is widely used for estimating annual and individual storm erosion from field-sized watersheds. Records from a single precipitation gage in climatic areas dominated by thunderstorms can be used to estimate the erosion index (EI) only for the point in question on individual storms or for a specific annual value. Extrapolating the results for more than about a mile leads to serious error in estimating the erosion by the use of the USLE. Short time intervals must be used to obtain an adequate estimate of the EI when using the USLE. The variability of the annual EI can be approximated with a log-normal distribution. All studies indicated that investigations are needed to facilitate estimating the average annual EI from precipitation data as reported by state climatological summaries for states west of the 104th meridian. Additional work is needed to facilitate estimating the EI value from the precipitation data available in most areas of the southwest where thunderstorms dominate the rainfall pattern.

From the Proceedings of the 1975 Meetings of the Arizona Section - American Water Resources Assn. and the Hydrology Section - Arizona Academy of Science - April 11-12, 1975, Tempe, Arizona / Space-time variability in the hydrologic characteristics of four major soil series represented in the Silverbell validation site was investigated by sampling the infiltration characteristics, at randomly selected locations, under several vegetative covers within each series. The experimental data was the time distribution of infiltration which, for each sampled location, was fitted by least squares to the Philip's infiltration equation. The parameters of this equation have physical interpretation and therefore were used as measures of the infiltration characteristics. Analysis of variance was used to investigate the spatial variability in the parameters. The mean values of the parameters for selected soil-vegetation combinations were used to simulate runoff due to a rainfall event over a desert catchment "containing" the given combination. Statistical tests show that there is no significant difference among the infiltration parameters of all the soil-vegetation combinations. However, the statistically insignificant variations in the parameters produce significant variations in simulated runoff volumes indicating the sensitivity of the runoff generating process to infiltration characteristics vis-a-vis the hydrologic properties of the soils.

From the Proceedings of the 1975 Meetings of the Arizona Section - American Water Resources Assn. and the Hydrology Section - Arizona Academy of Science - April 11-12, 1975, Tempe, Arizona / Water can be supplied to many arid areas by harvesting the precipitation that falls on artificially prepared water-repellent soil catchments. The failure, in 1973, of wax-treated water harvesting catchment led to this study which indicates that the failure was due to swelling and shrinking of the treated soil which caused complete structural breakdown and loss of repellency. The laboratory freeze-thaw studies demonstrated that the smoother the plot, the less chance of freeze-thaw damage. Generally, coarser-textured soil can withstand freeze-thaw cycles better than finer-textured soils. Soil properties, other than texture, may also affect resistance to damage by freeze-thaw cycles. Increasing the repellent application rate may improve resistance to breakdown.

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 / Lynx Creek Watershed is located eight miles southeast of Prescott, Arizona, on the Prescott National Forest. The watershed consists of 13,600 acres, which are National Forest Lands. Approximately 600 acres in the watershed are patented mining claims. Gold was discovered in Lynx Creek in 1863 and the watershed was extensively mined for gold, silver and copper. The aftermath of the mining has resulted in numerous mine shafts, waste dumps and mill tailing ponds that were abandoned after the ore was played out. Drainage from the orphaned mine sites contribute a certain extent of toxic mineral and sediment pollution into Lynx Creek and eventually into Lynx Lake. Lynx Creek carries runoff which is slightly acidic in nature and has high concentrations of copper, manganese, iron, zinc and sulfates. The mineral pollutants have reduced the recreational and fisheries potential of the Lake. The Sheldon Mine complex consisting of a waste dump and the mill tailing dump were considered the major sources of pollutants into the Lake. The Sheldon Tailings pond was rehabilitated during the summer of 1975 and the waste dump during the summer of 1976 as part of a reclamation study that is being sponsored by SEAM (Surface Environment and Mining). The study is being conducted cooperatively by the School of Renewable Natural Resources, University of Arizona, and the Prescott National Forest. Both sites were culturally treated and dressed with lime and topsoil. Studies are currently being conducted to measure the beneficial effects of the reclamation projects.

From the Proceedings of the 1978 Meetings of the Arizona Section - American Water Resources Assn. and the Hydrology Section - Arizona Academy of Science - April 14-15, 1978, Flagstaff, Arizona / Discontinuous water quality data for the San Pedro River in southeastern Arizona is analyzed to illustrate the nature of water quality problems of ephemeral flow. The San Pedro drains a northerly-trending basin of 4,483 square miles, of which 696 are in Mexico and 3,787 in Arizona. Several questions arise in the consideration of a rational management plan: what is the necessity for protection of ephemeral flow quality when the channel consists of a dry wash much of the year, where there is little aquatic or wildlife to protect, and where occasional flow during flood conditions is put to little use by humans; and where and how do we use the ephemeral flow it is indeed decided to utilize it. Such questions as these form the basis of this discussion in an effort to bring out the point that water quality problems of ephemeral flow in arid areas differ from those in the humid zone. It is argued that in between the extremes of prohibiting or treating all runoff or eliminating all sources of pollution, there is actually little that can be done to control all sources of pollution in this typical arid stream, despite the fact that standards, for the most part unattainable, have been set for this flow.

Bibliography :leaves 158-171. A monitoring program, funded by the South Australian government (through the former MFP Development Corporation), was established to monitor the quality and quantity of storm water entering and leaving the wetland. This study formed part of the funded program. Simple regression models were developed; and will assist in the monitoring of performance of the wetland to alleviate the pollutant load into the Barker Inlet.

A ETA Guandu é de vital importância para o estado do Rio de Janeiro por ser responsável pelo abastecimento de 8,5 milhões de pessoas na Região Metropolitana. Este trabalho tem como objetivo efetuar uma análise qualitativa de sua vulnerabilidade, em relação à qualidade e quantidade de água captada, perante diversos fatores de estresse, visando dimensionar a importância da variabilidade climática na composição de sua vulnerabilidade. Adotou-se o conceito de vulnerabilidade como função da exposição (grau em que um sistema experimenta estresses), da sensibilidade (grau em que um sistema é afetado pelo estresse) e capacidade adaptativa (capacidade de um sistema de se ajustar, moderar ou lidar com as conseqüências de um estresse). Dessa forma, foi possível desenvolver uma metodologia de análise qualitativa de vulnerabilidade, específica ao caso da ETA Guandu, perante quatro fatores de estresse considerados como os mais determinantes para a vulnerabilidade atual: i) variabilidade climática; ii) transposição; iii) condições ambientais e qualidade da água e iv) acidentes ambientais. Os resultados evidenciaram que o maior grau de vulnerabilidade da ETA Guandu se relaciona à transposição, já que diversas partes de sua infraestrutura não dispõem de ações de manutenção preventiva. A vulnerabilidade devido às condições ambientais é também intensa, principalmente a turbidez no período chuvoso; entre 2000 e 2010, a ETA Guandu foi parcialmente paralisada 22 vezes em função do grande aporte de sedimentos. Não identificamos nenhum registro de paralisação total da ETA Guandu em função de acidentes ambientais, embora algumas vezes estes tenham imposto a paralisação da transposição. O componente variabilidade climática (intensificação de eventos hidrológicos extremos) revelou-se como o estressor menos determinante da vulnerabilidade atual.

[pt] Os comitês de bacia foram instituídos pela Política Nacional de Recursos Hídricos como responsáveis pela gestão das bacias hidrográficas. Sua atuação é regida tanto pela legislação pertinente, como aspectos relacionados à sua dimensão organizacional, assim também como a dinâmica que se forma pela interação destes elementos. Nesse intuito, o presente estudo teve como propósito analisar institucionalmente o Comitê de Bacia Hidrográfica do Guandu, restrito e elencado pelos padrões: legais, normativos e sócio-organizacionais, sob a perspectiva da Sustentabilidade Institucional. Neste sentido, foi realizado um levantamento da legislação pertinente, assim como os documentos internos que definem a estrutura e o funcionamento do Comitê Guandu, além da análise presencial das reuniões da plenária entre 2011 e 2012. Assim verificou-se ocorrência de disfunções na sua dimensão organizacional, assim como de incongruências na implementação dos seus instrumentos de gestão, capazes efetivamente de interferir na sua atuação, comprometendo a sua missão institucional em face ao Desenvolvimento Sustentável. Por fim, foi identificada a ocorrência do Isomorfismo Coercitivo devido às pressões sofridas pela conjuntura política do cenário ambiental no estado do Rio de Janeiro, assim como a própria estrutura e composição do Comitê Guandu. / [en] With approximately 13 percent of the surface water resources of the planet, Brazil still suffers from supply problems in their main cities, and the major reasons are: the location of springs in relation to population served and degradation of water bodies in these areas. Currently over 50 percent of the world population lives in urban areas, and the expectation is that by 2050 reaching 70 percent (UN-Habitat, 2008). Although it is not exclusive of the cities are especially them, these problems have higher impacts, and therefore turn out to be aggravated from a trend of the 21st century: the concentration of population in urban centers. Meanwhile, cities gradually became the focus of environmental debates, due to its increasing expansion, result of the displacement of populations who seek them the infrastructure, facilities and opportunities not found in rural areas. This way the sustainability of urban areas is emerging as one of the challenges to be faced by all of society, and more specifically in the case of water resources in Brazil by its governing bodies, watershed committees that are formed by representatives of organized civil society, government and users. Brazilian law regarding the environment was structured from the opening policy in the late 70s. So from this new conjecture, environmental legislation gradually set up, and with regard to water resources there were two notable moments: the definition of water as a public good by the Federal Constitution of 1988 and the creation of the Federal Policy of Water Resources, by law 9433/97. By instituting the watershed committees as responsible for the management of river basins, began a new phase in water management in Brazil.

The main goal of our thesis is a lexicographic processing of names of watercourses in the Upper Lužnice (Ober Lainsitz) river basin. Due to its location on the borders of Czech and German speaking territories and gaps in Czech methodological approaches our thesis is based on sophisticated theories of German hydronomastics that reflect common etymological roots of European water names as well as of the Slovak ones that strive for modern international processing of hydronyms complying with uniformed, obligatory methodology of the lexicographic project Hydronymia Europaea. Water names that were excerpted mainly from archival and contemporary maps have undertaken semantic classification invented by V. Šmilauer and M. Frydrich regardless of the source language. Along with the verification of suitability of the foreign methodology adopted for Czech hydronyms the thesis makes partial advice on its innovation that could help make the using of the lexicon more user friendly.