A Program Of The

City Of Columbia

Sanitary Sewer Overflows - FY15/16

CW2020 Employee Newsletter Vol. 4, No. 2

In June 2016, the Wastewater Collection and Transmission System experienced four Sanitary Sewer Overflow (SSO) events. Four of these events occurred during dry weather. The total number of SSOs for the 2015-2016 Fiscal Year finished at 155. This is a net increase of 33 over the 2014-2015 Fiscal Year, which had 122 events.

This year’s increase in SSOs was due to wet weather events and collapsed lines, with 41 more SSOs occurring in those two categories this fiscal year (FY15/16) than the previous fiscal year (14/15). The total number of SSOs per 100 miles of pipe for the City of Columbia was approximately 14.09.

As of June 2016 (FY15/16), the total SSO estimated volume was 6,080,061 gallons. In comparison, the total SSO estimated volume for the 2014-2015 Fiscal Year was 1,237,897 gallons. This was a net increase of 4,842,164 gallons.