By utilizing the new intelligent control logic of the AWS ISOS systems, upstream storage volumes for both sewer collection and pump station systems can now be maximized prior to overloading the downstream pump stations.

Since medieval times rulers have been aware of the impact of raw sewage improperly discharged to the environment.  Before treatment systems existed in 16th century England, King Henry VIII decreed that sewage troughs should be kept flowing so that they would not stagnate in London prior to reaching the River Thames. (London sewer system) It was not until the 19th century when America and parts of Europe developed wastewater treatment, that the concept of SSO materialized; however, communities were merely happy to have wastewater treatment systems, and did not complain greatly about overflows until the dawning of 20th century environmental awareness in the 1960s. At that time the USA began recognizing locations and frequencies of SSOs (
sanitary sewer overflows) in a systematic way. Local governments heard complaints of citizens, beach closure protocols were systematized and the U.S. Environmental Protection Agency began detailed engineering analyses for major cities across the country. After passage of the U.S. Clean Water Act, the 1980s saw spending of billions of dollars on system upgrading. In the 1990s Japan, the UK and a number of other European countries began earnest investigation of some of their countries’ overflow issues.



ISOS Panel