In many developing countries, the wastewater treatment plants that do exist are inadequately managed and maintained or may be overwhelmed by excessive volumes of water, particularly at times of heavy rainfall, requiring the release of untreated water.35
在许多发展中国家，虽然设有废水处理厂，但未予适当管理和维持，或者可能因水量过多，特别是在暴雨之时，需要释放未经处理的水。