…These plans, which are implemented to efficiently utilize the benefits of rivers and prevent flood damage, are collectively called river plans. River plans include flood control plans to control floods, erosion control plans to control sediment upstream, river channel improvement plans, and flood control plans that integrate these. They also include water utilization plans for water intake for agricultural and urban use, plans for navigation (both of which are collectively called low-water plans, as they apply when the river's water level is low, i.e., when the water volume is low), and hydroelectric power generation plans. River environment conservation plans, which aim to maintain, improve, and manage the river environment, are also important pillars of river plans. The focus among these plans varies depending on the circumstances of each country, the characteristics of the river, and the era. … *Some of the terms mentioned in the "River Improvement Plan" are explained below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…このような河川の恩恵を効率よく利用するとともに洪水の害を防ぐことを目的として実施される計画を総称して河川計画と呼んでいる。 河川計画には,洪水を処理する洪水防御計画,上流の土砂を処理する砂防計画,河道部における河川改修計画,およびこれらを総合する治水計画があり,また農業用水や都市用水のための取水などを目的とした利水計画,舟運のための計画(この両者は河川の水位が低い,すなわち水量が少ないときを対象とするもので低水計画と総称される),発電水力計画も含まれ,さらには河川環境の維持・向上・管理を目的とした河川環境保全計画も河川計画の重要な柱となっている。これらのうちいずれに重点を置くかは,それぞれの国の事情,河川の特性や時代によっても異なっている。… ※「河川改修計画」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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