Sanitary sewer overflow: Difference between revisions

Revision as of 07:22, 29 January 2007

Revision as of 11:21, 5 May 2007

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==Magnitude of the problem==

The United States Government has set a goal of upgrading every municipal treatment and collection system such that an overflow event would be expected in any given community no more frequently than every five years. Costs to achieve this goal approximate 88 billion dollars. This cost is in addition to approximately ten billion dollars already invested in the [[USA]]. Although the volume of untreated sewage discharged to the environment is less than .01 percent of all treated sewage in the USA, the total volume amounts to several billion gallons per annum and accounts for thousands of cases of gastrointestinal illness each year.<ref>[http://www.ens-newswire.com/ens/aug2004/2004-08-30-09.asp#anchor2http://www.ens-newswire.com/ens/aug2004/2004-08-30-09.asp#anchor2 EPA press release, August 30, 2004]</ref>. Advanced European countries and Japan have similar or somewhat larger percentages of SSO events.

==Engineering aspects==