北京是以地下水作为主要的供水水源,随着工农业生产的发展及居民的增加,地下水开采量大幅度增加,水位不断下降,单井出水量衰减,而且水质逐渐恶化,硬度升高。城近郊区一些地段地下水硬度超过 Beijing uses groundwater as the main source of water supply. With the development of industrial and agricultural production and the increase of residents, the amount of groundwater exploitation has increased dramatically, the water level has been declining, the discharge of single well has decayed, and the water quality has gradually deteriorated and the hardness has risen. Some parts of the city near the suburbs of groundwater hardness exceeded