Code Red: How this team helped stop MSD’s record April 30 sewage spill-attachment2 Published on June 19, 2013in Code Red: How this team helped stop MSD’s record April 30 sewage spill View full-size image Knife gate: This 400-pound knife gate — which closes off sewage flowing into the pump station — blew out of position April 30, leading to a shutdown that caused a major spill.