Final answer:
A storm sewer backup can lead to basement flooding due to overflow during heavy rainfall, especially in combined sewer systems. The potential for future flooding events exists and depends on several environmental and infrastructural factors.
Step-by-step explanation:
True, a storm sewer backup can cause basements to flood. The subject matter of this question involves understanding how storm sewer systems work and how they can contribute to flooding events. For example, in combined sewer systems, heavy rainfall can overwhelm the sewage treatment process, resulting in a mixture of stormwater and untreated sewage being released directly into the environment, which can lead to flooding conditions.
If the drainage capacity of the sewers is exceeded by the volume of water, it can result in backflow into basements and other lower-lying areas. Furthermore, during significant flood events, like the one from September 23, 2009, the potential for similar events in the future depends on various factors, including changes in climate patterns, urban development, and improvement in sewer infrastructure.
Basement flooding can occur due to other reasons such as heavy rainwater seeping through cracks in the foundation, inadequate drainage systems around the house, or a malfunctioning sump pump. It is important to address these issues to prevent basement flooding.