因为建设施工几乎不考虑设置充分的废物处理和污水处理系统，以至于城市的河道及运河逐渐变成垃圾场，堵塞到根本无法有效充当将雨水排入海洋的管道。
Because construction has occurred with scant regard for the provision of adequate waste disposal and sewage systems, the city’s rivers and canals have become garbage dumps, so choked that they can no longer serve as effective conduits to channel rainwater to the sea.