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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Guadalupe Watershed ： ウィキペディア英語版 Guadalupe Watershed The Guadalupe Watershed consists of of land within northern California's Santa Clara County. This watershed is owned and managed by the Santa Clara Valley Water District. The surface runoff from this area drains into the various rivers (namely the Guadalupe), streams, reservoirs or other bodies of water which all eventually gets carried into the San Francisco Bay (indicated below, with surrounding counties in red). Essentially, all the water from the creeks and rivers that make up the Guadalupe watershed, including water from storm drains, flows into the Guadalupe River, and then flows downstream into the San Francisco Bay at the Alviso Slough in Alviso. The Guadalupe watershed's main tributaries include Los Gatos Creek, Trout Creek, Hendlys Creek, Ross Creek, Pheasant Creek, Rincon Creek, Herbert Creek, and Golf Creek. Six major reservoirs exist in the watershed: Calero Reservoir on Calero Creek, Guadalupe Reservoir on Guadalupe Creek, Almaden Reservoir on Los Alamitos Creek, Vasona Reservoir, Lexington Reservoir, and Lake Elsman on Los Gatos Creek. The area covered by the Guadalupe River and its tributaries spreads over the neighboring cities of San Jose, Los Gatos, Monte Sereno, Campbell, and Santa Clara. == Mercury contamination == The Guadalupe watershed was an area of high activity during the California Gold Rush, and as a result, Mercury toxicity and its effects on surrounding citizens and wildlife is a major concern for the area, and monitored intensively. Because mercury is an effective magnet for gold, miners during the Gold Rush would regularly line their sluices with mercury to amalgamate the gold out. An estimated 6,500 tons of mercury was lost in the system of creeks and rivers along the coast between 1850 and 1920, and is still being detected today in the water, animal life, and riverbeds of these affected tributaries. The effects of mercury on aquatic environments are very complex and create a number of health and safety risks. The most dangerous effect is its conversion into methylmercury by bacteria in rivers and lakes, which is in fact a more toxic substance than plain mercury. Methylmercury has a capacity to be taken in by insects and other invertebrates which the fish eat, which are in turn consumed by humans. Through this process of biomagnification, the methylmercury concentration increases the further up the food chain it reaches. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Guadalupe Watershed」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.