Day 25

Combined sewer overflow

January 24th, 2012

Most of NYC's sewers are combined sewers, meaning they collect both sewage from buildings and stormwater runoff from the streets in a single pipe and carry it all to a wastewater treatment plant. During times of significant rainfall or snowmelt, however, the increased volume of runoff entering the sewer can exceed the capacity of the system. In order to prevent a backup, the excess (including untreated sewage) is dumped directly into area waterways.


  1. Rob says:

    Uh… Gross!

  2. Gail from SLO says:

    To which I would add … Yuck!

  3. Dorinda from Mentor, Oh. says:

    Oh that is just gross!

    Beautiful skyline shot though in the background.

  4. Leif says:

    Nice work Matt! Keep the photos coming!

Leave a Reply