中国北方平原的城镇同时还面临地表水位下降的困难。
Towns and cities are also facing difficulties as ground water levels fall in the major north China plains, he added.
由于地下水位不是平面的，而是随着地形起伏的，所以地下水和地表水一样受到重力的影响。
Because the surface of the water table is not flat but instead rises and falls with topography, groundwater is affected by gravity in the same fashion as surface water.
同时，地表水一旦入渗墙后土中，则可以通过砌体较快地排出，有效降低地下水位。
At the same time, once the surface water infiltration wall in soil, can be discharged through the masonry quickly, effectively reduce the ground water level.
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