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Freshwater systems in Canada are affected by a multitude of environmental stressors, including cultural eutrophication, introduction of non‐native species, and climate change. Multiple stressors can interact in unpredictable ways and generate novel ecological scenarios, thus creating challenges for lake management. Lake Simcoe is an example of an aquatic system impacted by multiple stressors, facing management challenges of deteriorating water quality and coldwater fisheries. In order to better understand stressor interactions and pre‐disturbance lake conditions, a long‐term perspective is necessary. Therefore, this study used paleolimnological techniques to assess changes in the water quality of Lake Simcoe over the past ca. 200 years. Sedimentary diatom assemblages were analyzed in 210Pb‐dated cores from five sites across the lake. Diatom assemblages recorded several pronounced and synchronous shifts over the last ca. 200 years. Modest lake‐wide shifts in diatom community composition occurred in the late‐1800’s and early‐1900’s, suggesting that early cultural disturbances, such as land clearance and canal construction, had relatively minor impacts on Lake Simcoe. However, starting in the 1930’s, agricultural and urban development intensified, as indicated by substantial increases in eutrophic taxa. The most pronounced lake‐wide shift in diatom assemblages occurred in the mid‐to‐late 1900’s, the taxonomic nature and timing of which strongly suggest a response to regional climate warming. Moreover, diatom compositional trends at all sites were significantly correlated with instrumental records of regional temperature and lake ice the last ca. 100 years. An additional and marked lake‐wide shift in diatom assemblages occurred in the mid-1990’s, coinciding with the invasion of dreissenid mussels. The combination of stressors acting concurrently on Lake Simcoe, as well as the lake’s distinct water chemistry and size, make it challenging to reconstruct single limnological variables (such as, total phosphorus) in this system. Nevertheless, overall patterns of diatom compositional changes from the five sites revealed the largest shifts occurred in the post‐1950 sediments and that change in lake‐water total phosphorus concentrations played a minor role. Our results imply that substantial changes in climate have amplified the effects of multiple stressors in this complex system. / Thesis (Master, Biology) -- Queen's University, 2010-08-04 12:03:42.267

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A company cannot survive without giving attention to quality. Ensuring quality in products is so important that many companies give major attention to actively managing processes to make sure that quality permeates everything the company does. Quality management is a company's unique approach for addressing all aspects of quality. It requires vision, a quality policy, a quality standard, a quality system and the control of the system. The water industry is a natural monopoly in which no competition exists to provide customers the opportunity to choose between different suppliers. Due to the monopolistic nature of a water utility, the tendency was previously to neglect the customer and his needs. For water utilities, the quality of the product water has always been the important factor mainly because of their responsibility towards the protection of public health. The quality emphasis was mainly towards meeting the demands of the primary and secondary sector of the water industry that is to provide water of an acceptable standard to the customers. It was only during the 1980's that water utilities became concerned about service quality in pursuance of the example set by the broader industry. Since then the emphasis on quality shifted gradually towards the tertiary sector of the water industry, the provision of quality services to the customer. The Namibia Water Corporations Act, 1997 requires that a performance contract should be concluded between the owners of the company (the State) and the Corporation. It further requires that the Namibia Water Corporation (NamWater) should formulate and maintain service standards in respect of the provision of water, services or facilities. As both these requirements are primarily based on efficiency, performance,achievements, cost-effectiveness and the optimum use of resources, there is a need to develop a system that will address all these aspects. This document describes the outcome of a study to develop a quality management system for NamWater that will address all these aspects, to identify shortcomings within NamWater and to monitor progress regarding meeting the quality standards on a continuous basis. Together with the development of a proposed quality policy document, this study also resulted in the compilation of a proposed set of service standards as prescribed by the Namibia Water Corporation Act of 1997. Performance gaps where existing practices in NamWater do not meet industry's best practice were identified by making use of performance indicators developed by the International Water Association (IWA) and the benchmarking exercise of the Water Utility Partnership (WUP). A set of performance indicators was developed to monitor the progress of NamWater in meeting standards on a continuous basis. The study concludes with a proposal for a quality management system for NamWater to ensure that the work is carried out in accordance with the quality policy and the quality standards. To identify possible performance gaps in NamWater, the information from the Water Utility Partnership programme on performance indicators and benchmarking was used to evaluate the performance of the NamWater against other water utilities in Africa. In general terms, the performance of NamWater is better than in many other African countries. However, by evaluating the results of the benchmarking exercise performance gaps were identified within NamWater that needs urgent attention. This study identifies the Sales Process as being the area to concentrate on as a first priority, with the focus on the improvement of revenue collection, the improvement of customer relations and the decrease in total cost. The Support Process should be the second priority with the improvement of the asset management organisation high on the list. There are two fields in the Production Process that needs special attention. They are unaccounted-for-water, and supply interruptions. The identification of industry's best performers in the various fields where performance gaps exist is beyond the scope of this study. It will form part of the implementation phase of a quality management system for NamWater. To monitor NamWater's performance on a continuous basis over time in meeting the requirements of the quality policy, various performance indicators have been identified. These indicators will also identify future performance gaps, determine various performance trends in the company, and measure and monitor the benefits of the implementation of best practice. Performance indicators were identified (from the IWA and WUP programmes) due to the fact that it will serve the abovementioned purpose and it is compatible with the present situation within NamWater. As can be seen from the performance gap analysis all three processes in the NamWater organisation have shortcomings that will have to be addressed through a quality management system. The situation is ideal for the implementation of TQM for NamWater. Such a project should be high on the priority list of the management of the company. / Thesis (M.B.A.)-University of KwaZulu-Natal, Pietermaritzburg, 2004.

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Excess rural and urban nutrient inputs have led to downstream water quality degradation. Landowners in a small watershed in south central Manitoba, Canada have installed small dams as flood control mechanisms. Previous work has shown these dams and reservoirs are effective at decreasing total phosphorus (P) export, however questions of permanence, daily P fluctuation, and mechanisms influencing P retention still remain. Sediment nutrient dynamics can exert an important control on water quality on daily, monthly, and yearly timescales. To help better understand spatial and temporal patterns of P retention, P sorption assays were constructed (equilibrium P concentration or EPC0) and compared monthly measurements of EPC0 in small dammed reservoirs with their natural analog, stream pools. Dammed reservoirs and stream pools both showed a strong capacity to sorb P from the water column and as such, sediment processes represent a P sink across much of the catchment. In situ high frequency P sensors were deployed to assess short-term changes in P concentrations in four dammed reservoirs. Diel changes were only apparent later in the summer (August) but what drives these changes is unknown. Dam design to optimize nutrient retention should consider factors affecting P retention, including sediment geochemistry, but also residence time, and water chemistry as potential controls on P sorption. Diel sampling results suggest that water quality monitoring regimes that rely on singular grab samples should aim to sample in the mid-morning, especially later in the summer, so as to not over or underestimate P concentrations in water bodies.

Natural waterways form an integral part of the urban and rural environment. In New Zealand, their uses are generally related to agriculture, drainage, power generation and recreation, but their value also extends to providing ecological services that are vital to the maintenance of a fully functioning environment. In the areas of the world that are considered to be developed, several functions and services that waterway systems initially would have provided, have been degraded, or lost completely, due to water abstractions, altered flow regimes and input of pollutants. In New Zealand, and around the world, groups of volunteers give up their time in order to help monitor the quality and state of waterways. However, there remains a distrust of data generated by such groups throughout the scientific community. This concern is also voiced by members of these groups, querying what the point of their monitoring is, if the data has no real use. As a result of this uncertainty about the data quality and its subsequent uses, data is often just entered onto a database with little, or no, analysis conducted. The purpose of this research was to ascertain the quality of the data generated by volunteers groups in New Zealand by comparing it with data collected by professionals from city and regional councils. Volunteer monitoring methods and tools were also compared with those available to professionals in order to determine if any differences observed were a product of equipment, or other factors. However, data generation is not the only purpose of these volunteer groups. By being involved, volunteers are gaining education, practical skills and knowledge they may not have access to otherwise, and they are meeting people and strengthening community ties. Volunteers from each group therefore also completed a survey to determine their knowledge of the programme they participate in, of the environment and freshwater, and to collect some basic background information. The Styx Living Laboratory Trust (SLLT) in Christchurch, the Wakapuaka Rivercare Group in Nelson and Wai Care in Auckland were the three New Zealand community water monitoring groups chosen to be the subject of this study. Generally, the volunteer conductivity and pH data was significantly different from that of their professional counterparts, with large differences obvious in the data sets from all three groups. Water temperature was the only variable that was consistently similar for volunteer and professional data. Comparison of the SLLT’s methods with professional-level methods, however, revealed that differences in the data sets may be due to a combination of factors including equipment (e.g., use of pH colour strips instead of meters), and variation in the monitoring protocols, rather than a lack of quality in the volunteer data. However, new dissolved oxygen and nitrogen monitoring methods utilised by Wai Care did produce some promising results, with some of the comparisons unable to be statistically differentiated from the professional data set. Visual assessment of the SLLT data over time suggests seasonal patterns in pH and conductivity, and possible increases in water clarity over time. Statistical analysis of the individual variables of pH, water temperature, clarity and conductivity, in the SLLT data revealed several significant predictors and interactions, including time, date and pH among other things. However, the very small effect size and the large data set suggest this may just be a product of the large data set with very few of these variable interactions having any real meaning with regards to management. Volunteers were predominantly over the age of 40, and were generally either very new recruits to their monitoring programmes (<6 months) or had been involved for a reasonably long time (>5 years). There were differing patterns of involvement between the groups with the WRG having volunteers mainly involved for >10 years while the SLLT had a large number of new recruits. There were also varying reasons volunteers chose to become involved however, the predominant reason was concern for the environment. Approximately half of the volunteers surveyed proved to be very knowledgeable about their programme and understood the purposes of the monitoring programme, although most were associated with a science-related industry and therefore likely already had this knowledge. More education and training would be needed to bring all of the other volunteers up to this level. All volunteers had good knowledge of issues in New Zealand’s environment and freshwater currently face, with public apathy considered the most pressing issue. In summary, despite the lack of clear statistical similarities between volunteer and professional data sets for some variables, the data do not appear to be randomly inaccurate and could be corrected to be combined with professional data. The benefits the volunteers gain appear to outweigh any issues that may be present in the data, as long as the volunteers perceive the data to be ultimately useful. Volunteer-based water quality monitoring has proved to be a valuable way to gather environmental data, educate the community and improve their commitment to local waterways.

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