地下水与地表水的比较(英文版).doc

Groundwater： ㈠ Definition: It refers to the burial and movement in different depth below the surface of the soil and rock gap in the water, the narrow sense of the groundwater is the underground 1000m range of water. ㈡ Features: ① Flow slowly. ② Water quality parameters change slowly. ③ Once the pollution, it is difficult to restore. ④ Differences in burial depth, the temperature variation ofdifferent. ⑤ Water quality status after removing easy to change. ⑥ Little influence from the outside word. ⑦ Located below the water resisting layer, which belongs to the static water. ⑧ Cycle update cycle is long.