Because of the lack of water absorption by structures and paved roads, runoff is substantially higher in urban areas.
Ineffective Sewage Systems:
Many of the sewer systems that are still in use today date from the immediate post-World War II period. The majority of these systems struggle even without the additional strain of intense rain or storms because their infrastructure is outdated and deteriorated at this time.
Insufficient Drainage:
Less green space is available in metropolitan areas due to rising urbanization and the constant construction of new buildings. Urbanization depletes the natural drainage systems that are supported by vegetation and soil.
Rapid Population Growth:
Urban population growth is accelerating, yet most cities' infrastructure cannot keep up. Populations have increased during the post-war era, outpacing the capacity of the sewage facilities put in place at that time. It stresses systems that are already vulnerable.
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