论文部分内容阅读
1 认清水资源紧缺现状,创建节水灌溉示范市,走可持续发展的道路许昌市水资源严重短缺。水资源总量多年平均为8.9亿m~3,人均210m~3,为全国人均占有量的7.7%,全省人均占有量的31%,是全国40个严重缺水城市之一。据计算分析,全市平水年缺水1.14亿m~3,中旱年缺水3.06m亿m~3。同时又存在严重浪费现象,渠系水的利用系数仅有0.5,深层渗漏达30%以上,水资源的有效利用率很低。地下水超采严重,据统计,年均超采浅层地下水0.6亿m~3,使地下水位从1985年的3.4m降
1 recognize the status quo of water scarcity, create a water-saving irrigation demonstration city, take the road to sustainable development Xuchang City, a serious shortage of water resources. The average annual total amount of water resources is 890 million m 3, with a per capita population of 210 m 3, accounting for 7.7% of the national average and 31% of the province’s per capita, making it one of the 40 cities with severe water shortages. According to calculation and analysis, the city’s water shortage is 114 million m 3, and the water shortage is 3.06 million m 3 during the dry years. At the same time, there is a serious waste phenomenon. The coefficient of utilization of canal water is only 0.5, and the deep leakage reaches more than 30%, and the effective utilization of water resources is very low. Over-exploitation of groundwater is serious. According to statistics, over-exploitation of shallow groundwater by an average of 60 million m 3 per year has resulted in a decrease of groundwater level from 3.4 m in 1985