Richard Field & Daniel Sullivan 
Management of Combined Sewer Overflows [PDF ebook] 

There are approximately 10, 000 combined sewer overflow (CSO) locations in the United States. During peak storm events they can release about 1.2 trillion gallons of waste and up to 95% of a municipality’s raw sewage into surface waters. Although many cities have initiated programs, the CSO problem remains largely unsolved and continues to be a majo