Mud and sand accumulation and earth crust movement, which induces lake basin evolving continuously, make lake water level go up or down.

泥沙淤积和地壳运动使湖盆不断演化，导致水位不断升降。

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At the city of Coba the Maya built dikes around a lake in order to raise its level and make their water supply more reliable.

在科巴市，玛雅人围绕着一个湖泊修建堤坝，以提高水位，使供水更加稳定可靠。

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The surrounding basin is that of Red River, but because Devils lake's own basin is closed, the lake must reach a sufficient water level before the water travels elsewhere.

周围的属于红河的流域，但是由于魔鬼湖流域是封闭的内流区，必须使湖面水位达到足够的高度，水才能流到其他地方。

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Meanwhile, the water level in Lake Lanier remains close to the record low reached in December.

ECONOMIST: Georgia opens a northern front in its battle with drought