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Drinking water and water for domestic use often come from groundwater. In order to protect this water, local water authorities c
Drinking water and water for domestic use often come from groundwater. In order to protect this water, local water authorities c
admin
2009-01-13
34
问题
Drinking water and water for domestic use often come from groundwater. In order to protect this water, local water authorities can apply to local administrative authorities to mark certain locations as water protection areas. The size of these areas is calculated in such a way that the quantity of groundwater taken from them corresponds to the actual rainfall going into them. In the water protection, areas certain uses of the land and activities on the land are banned or restricted. Water protection areas fall into three zones. Zone 3 is the outermost zone with a diameter of 4 kilometers around the groundwater well. Here no chemical works or the use of pesticides (杀虫剂) are allowed. Zone 2 is determined around the so-called 50-day line. It is assumed that after 50 days in the groundwater harmful bacteria will have died off. Here settlements and fertilizer storage are forbidden. Zone 1 marks the ten-meter boundary around the well. Here, any use of the land, as well as access by unauthorized persons, is forbidden.
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答案
饮用水和家庭用水常取自地下水。为保护地下水源,地方用水管理机构可向地方政府提出申请,将某些区域标记为水保护区。水保护区的面积用以下方法计算:从水保护区抽取的地下水数量相当于实际渗入水保护区的雨水流量。在水保护区,土地的某些用途和地面的某些活动将被禁止或受限制。水保护区分为三个区。第三区是外区,以地下水井为中心,直径 4公里。在该区,不得修建化工厂或使用杀虫剂。第二区围绕所谓“50天线”确定。人们设想,地下水中的细菌在50天内将全部死亡。在该区,不得修建住宅和储存化肥。第一区是以地下井为中心10米以内的地域。在该区,不得以任何形式使用土地,任何人未经许可不得进入。
解析
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