TA的每日心情 | 擦汗 2019-6-16 23:34 |
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签到天数: 1277 天 [LV.10]大乘
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njyd 发表于 2013-11-12 13:07
有几种情况。
一是河流本身水量就小,到冬天枯水期还要把水留着第二年春灌用。
二是灌溉用水库,把水引到 ...
尼亚加拉瀑布的水哪里可能全引走。那完全是胡说了。
To preserve Niagara Falls' natural beauty, a 1950 treaty signed by the U.S. and Canada limited water usage by the power plants. The treaty allows higher summertime diversion at night when tourists are fewer and during the winter months when there are even fewer tourists. This treaty, designed to ensure an "unbroken curtain of water" is flowing over the falls, states that during daylight time during the tourist season (April 1 to October 31) there must be 100,000 cubic feet per second (2,800 m3/s) of water flowing over the falls, and during the night and off-tourist season there must be 50,000 cubic feet per second (1,400 m3/s) of water flowing over the falls. This Treaty is monitored by the International Niagara Control Board. |
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