Water resources systems of irrigation district are composed with surface water system and groundwater system.

灌区水资源系统由地表水系统与地下水系统构成。

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The groundwater allocation in red beds is controlled by environment factors such as climate, geomorphology, surface water system, lithology and tectonics.

红层地下水水量受控于气候、地形地貌、地表水文网、岩性、构造运动等环境因素。

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If no drainage system exists, the water table rises, bringing dissolved salts to the surface.

如果没有排水系统，地下水位就会上升，把溶解的盐带到地表。

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Mirra deep cleans any type of in-ground pool surface and water without using the pool's filtration system, hoses or booster pumps, which results in energy cost savings from running these pool systems less frequently.

ENGADGET: iRobot flaunts the Mirra 530 pool cleaning robot, sends the Looj 330 abroad

In addition to containing the vast majority of the liquid freshwater on the surface of our planet, humans use lakes for more purposes than any other type of water system.

UNESCO: Summary

The habitable zone is the region of a planetary system which is neither too hot nor too cold - such that water on the surface of a planet will neither evaporate nor freeze, but instead can stay liquid.

BBC: NEWS | Science/Nature | Earth-like planets may be common