Assessment of Groundwater Quality in Zhengzhou

摘要

Water shortage and pollution are serious problems which are obstacles to sustainable development of the society and the economy in Zhengzhou. To ensure public safety and reduce contamination, it is necessary to assess the groundwater quality in Zhengzhou. Fuzzy Synthetic Evaluation is used to confirm the extent of groundwater contamination. The results show that grades I, II and III (the Chinese Water Quality Standards) account for 91% and that grades IV and V account for 9% of the shallow groundwater. Grades I and II account for 94% and 6% of the deep groundwater quality. These results reveal that a part of the shallow groundwater quality is seriously contaminated but deep water quality is safe, which coincides with the results of cluster analysis. Based on the results of fuzzy synthetic evaluation, using Geographic Information System (MAPGIS) to assess the direction of groundwater flow around the monitor wells, we deduce that the industrial wastewater from upstream had probably infiltrated into the deep confined groundwater.