However, we are not immune to drywell flooding as the municipal storm water facility backs up. Not only it backs up, it also increases moisture and humidity.
Here is a good New York Times article of sewer and storm water pollutions. It has contributed floodings in many multi-unit buildings.
When it backs up, it affects tenants living lower floors especially with teraces above them. We need to keep an eye on clearing drywell and watch for flooding.
"To combat these shifts, some cities are encouraging sewer-friendly development. New York, for instance, has instituted zoning laws requiring new parking lots to include landscaped areas to absorb rainwater, established a tax credit for roofs with absorbent vegetation and begun to use millions of dollars for environmentally friendly infrastructure projects.
Philadelphia has announced it will spend $1.6 billion over 20 years to build rain gardens and sidewalks of porous pavement and to plant thousands of trees."
