Prehispanic water pressure: A New World first

Ancient cultures have a wide range of water control management techniques, each associated with a particular purpose, including water for consumption, agriculture, flood control, drought relief, and rituals (Scarborough, 2003). One technique that has received limited archaeological attention is the purposeful creation of water pressure to perform useful work. Perhaps the earliest such example was found on the island of Crete in a Minoan palace and dates as early as 1400 BC. Terracotta pipe segments with graded diameter reductions were used to create fountains (Evans, 1921–1935). Although gravity and the weight of water are the most efficient means of generating water pressure in a closed conduit, natural conditions (climate, geology, topographic slope, etc.) that might lead to the construction of water pressure systems are less clear. Here we show that the Classic Maya (AD 250–600) constructed a water pressure system with the potential to control the flow of water within an urban area. By burying a conduit along a steep ephemeral channel passing through a residential group, upland springs could be diverted to build pressure in the conduit to provide a dry-season supply of water. Up to 6 m of hydraulic head could have been recovered to lift water from the pressurized conduit to a point of use. Water pressure systems were previously thought to have entered the New World with the arrival of the Spanish. Yet, archaeological data, seasonal climate conditions, geomorphic setting, and simple hydraulic theory clearly show that the Maya of Palenque in Chiapas, Mexico had empirical knowledge of closed channel water pressure predating the arrival of Europeans.     

Omstrede Land – Die Historiese Ontwikkeling van die Suid-Afrikaanse Grondvraagstuk, 1652-2011

Abstract

This article aims to analyse the water policy of the French Protectorate in Morocco (1912–1956). After the proclamation of the protectorate, actions on the part of the new rulers affected both the modern and traditional water sectors. The authorities aimed to regulate water resources to help economic growth and favour the settlers living in the occupied areas. On the management side, they tried to adapt traditional institutions and practices to those of metropolitan France, while respecting tradition to some extent. During the first half of the 20th century, these colonial interventions caused profound changes in the established order, which can still be seen at the heart of water management systems used today in this part of the Maghreb. For the purposes of this article, we have adopted evolutionary and institutional theories and applied a methodology based on historical and anthropological analysis, with contributions from the fields of law, economics and geography.     

Books Received

While improving the “hard” resources of the physical infrastructure is important to facilitating cross-border trade, studies of global supply chain logistics performance suggest that expanding the focus to include “soft” infrastructure resources will be critical for future gains. Border management is increasingly important to North American trade facilitation, yet little is known about what constitutes the soft infrastructure of border crossings or how to design and manage this infrastructure for improved performance. Hence, this study uses an exploratory research design to examine the nature and dimensions of the soft infrastructure of border crossings. The research relies on a grounded-theory analysis of primary data collected in an exploratory case study of two border crossings between Alberta, Canada, and Montana, US.     

Wellsprings of Belonging: Water and Community Regeneration in Queensland

ABSTRACT This article considers how local communities in South Queensland make use of the cultural meanings encoded in water to articulate social connections and notions of belonging. Drawing on recent ethnographic research, it compares the activities of a community catchment group in Brisbane, and participants in a water festival in Maroochydore, exploring how each group engages creatively with local water sources to materialise particular beliefs and values about identity and belonging. Their creative efforts range from conventional attempts to strengthen local community ties through inclusion in catchment management, to more subversive visions, which resist inclusion in the mainstream and promulgate ‘alternative’ social and environmental values.     

William Gould,Land Agent and the Rural Community in Nottinghamshire and Derbyshire 1783–1788

The land agent played an important role in community relationships. His position was frequently one of mediator and liaison between landowner and tenant, although his role often extended to settling disputes more generally. These relationships are often hidden in estate correspondence but in the case of William Gould agent to the Duke of Portland are more readily available through his diaries. This article will utilise this valuable resource to explore how the land agent of a large estate which was entering a period of industrialisation interacted with both agricultural and industrial communities.     

China's Infrastructure Investment Boom and Local Debt Crisis

A noted Hong Kong-based economist addresses the emerging financing problems prompted by debt-laden local governments in China in the aftermath of the global financial crisis. More specifically, using the most recent data available, he traces the root of China's local debt overhang to a protracted debt-financed infrastructure investment boom in which several key institutions (the cadre evaluation system, the land management regime, and the banking sector) have created an environment that draws local governments into a land-infrastructure-leverage trap. The author argues that the resulting high levels of debt may ultimately impede the country's efforts to mitigate structural imbalances in its economy. Journal of Economic Literature, Classification Numbers: H600, H700, P200, P300. 3 figures, 9 tables, 121 references.     

New radiometric dating of water management features at the prehistoric Purrón Dam Complex,Tehuacán Valley,Puebla, México

Recent investigations at the prehistoric Purrón Dam Complex in the Tehuacán Valley of southern Puebla, México applied radiometric dating to more securely date the complex. Ceramic-based dating in the 1960′s placed the Dam's origin to the Formative Period. While Formative Period origins are widely accepted, the chronology lacks resolution and direct dates. Samples from impounded sediments behind the dam and from prehistoric canal fill were dated through Optically Stimulated Luminescence (OSL) as well as both standard ¹⁴C and accelerated mass spectrometry (AMS) assays. These samples directly date the functioning of the water management features within the complex. The results confirm the Formative Period origins of the Purrón Dam, and offer new insights into the construction and functioning of the dam and irrigation system.     

黑河中游湿地社区管理评价的居民感知研究——以甘肃省酒泉市六分湿地为例

以黑河中游酒泉市六分湿地社区管理为例,从居民感知视角,采用因子分析、非参数检验等方法评价了湿地社区管理绩效。结果表明:整体居民感知均值为3.71,社区管理模式符合当地社会经济及环境的发展需求;不同性别的居民感知差异不显著(P>0.05),与男女性格差异吻合;各年龄段的居民感知存在差异(P<0.05),感知规律曲线大致呈倒\"U\"形;不同文化程度的居民感知差异显著(P<0.05);不同收入的居民感知差异却不显著(P>0.05)。不同利益群体对社区管理的关注视角不同,居民感知存在差异。资源管理居民感知研究,尊重利益相关者的价值判断,注重地域性文化及居民综合需求的影响,实现了资源管理的集成定量评价。     

Water, technology, and the courtroom: negotiating reclamation policy in territorial New Mexico

Historical investigation of arid landscapes and communities in the American West has long focused on the pivotal influence of federal reclamation policy, typically characterizing its implementation as the application of scientific and technological methods to a variety of water resource management issues. This paper departs from traditional views of reclamation by highlighting the highly variable and contingent ways in which new science-based forms of water management were proposed and negotiated in specific local places with particular cultural, legal, and historical geographies. Drawing theoretically from literature on the ‘geography of science,’ the paper probes the ways in which authority for a scientific approach to water management was created, negotiated, and expressed in local and regional contexts in the Territory of New Mexico, where authoritative systems of practical resource use and administration had been in long use before the U.S. government initiated its federal water reclamation program in 1902. Specifically, the paper examines two disputes entered and argued in front of northern New Mexico’s Rio Arriba District Dourt between 1903 and 1905. By departing from the geographical and scalar perspectives typically applied to environmental histories of the West and its reclamation landscapes, this ‘microgeographical’ approach promises a fresh perspective that emphasizes the highly contingent ways in which science-based water policy was implemented in multiple and complex environments.