It is called "Project Clear" and as the name suggests, the idea is to make improvements to the wastewater system in the St. Louis region. The problem is an old one: when it rans hard, storm water often gets into the wastewater system and floods it causing sewage to back up into home.
"Project Clear" will involve several initiatives which include creating massive underground tunnels and getting residential downspouts off the sanitary sewer system. This is not a short-range problem. To fix the system will take 23 years and cost $4.7 billion.
MSD is required to make the improvements after the U.S. Environmental Protection Agency sued MSD because of its ongoing overflow problems.