 Like many local municipalities, the Godfrey Street Department has a calendar full of work through the summer. There are large projects and small. Some of the bigger projects are still to come this summer. And among the questions community members asked, the Riverfront Advisory Commission meeting Tuesday was this. What is the difference between a 100-year flood and a 500-year flood? The commission is considering putting up a measure to try and control that flooding, some of which would be a flood wall.