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Abstract: This paper describes an algorithm that has been developed to process field data from two upward looking sonars, one high (546kHz) and one low (235kHz) frequency, a 2MHz current profiler and a monitoring station, to measure surface ice characteristics on the North Saskatchewan River in the north east of Edmonton, AB, Canada, during the 2009/2010 freeze-up season. The algorithm used to calculate pans/rafts drafts and lengths, and the surface ice concentration is described. The validity and the accuracy of this technique were tested and computed surface ice conditions are presented. For the purpose of examining the effects of hydro-meteorological conditions on measured pan characteristics, the freeze-up period was divided into three distinct stages depending on the measured surface ice concentration. Pan/raft drafts were found to range from 0.1 to 1.0m and pan/raft lengths from 0.6 to 8.0m. The sonar proved to be very accurate in detecting the exact surface ice conditions locally above the sonar beam. However, interpretation of the results can sometimes be challenging, especially when physical processes such as bridging affect local ice conditions. Therefore, additional visual observations (e.g. time lapse photography) of surface ice conditions are recommended to aid in the interpretation of sonar measurements. [Copyright &y& Elsevier]

Between 1936 and 1940, the Lady Tweedsmuir Prairie Library Scheme sent approximately 40,000 books to readers in rural areas of the western Canadian provinces of Manitoba, Saskatchewan, and Alberta. Founded and directed by Susan Buchan, Lady Tweedsmuir, the wife of the Governor General of Canada, after visiting Depression-ravaged Prairie communities, the Scheme received the support of philanthropic foundations in Canada and the United States, the Women's Institute, women's service organizations, and individual donors of books. While the Scheme is mentioned in passing in biographies and local histories, little is known about the scope and scale of its activities or how it was organized or operated. Using primary and archival sources in Canada and the United States, this paper explores the history of the Scheme and its role in the distribution of books, the promotion of literacy, and the creation of libraries in the Canadian West during the Great Depression. [ABSTRACT FROM AUTHOR]

Abstract: Flooding and flood control long have been topics of concern for geographers and historians of North America, from Gilbert White''s foundational work to attempts to understand the recent disaster in New Orleans. This paper considers the problem of flood control along the Assiniboine River in the province of Manitoba, Canada. The first section addresses the local landscape and the larger context, explaining changes in the relevant human and physical geography. The second section examines efforts to mitigate flooding, focusing on how the risk of inundation was shifted in location (not eliminated altogether) and compounded through time (not progressively resolved). The third focuses on a further source of complexity: the contested character of government jurisdiction. This final section also addresses major mid twentieth century changes in mitigation efforts: in the light of flooding on an unprecedented scale, governments became more open to compromise and more willing to undertake substantial projects. Gilbert White asserted that while floods are natural occurrences, flood damages are the responsibility of humanity. The question of responsibility might seem relatively clear in relation to flood mitigation, given that dykes are human constructions. The history of flood mitigation along the Assiniboine would suggest, however, that assigning responsibility for the failures and successes of flood mitigation is not so straightforward. [Copyright &y& Elsevier]