We discovered the scupper / exhaust connection issue on our way to Hansen Rigging in Alameda. We were concerned about the scupper hose being in place with the hole in it, so we immediately replaced the scupper with a new hose. This meant that we had to set up the engine exhaust differently before we could move the boat back to Berkeley.
There was an existing vented loop (missing a duckbill valve). Two hoses were running forward to the engine, and the third hose was connected in to the scupper. We replaced Hose #3 with some nylon hosing we had laying around and connected it to our cockpit vents.
We were expecting it to spit some water, but we were expecting more air than anything – and we got a whole lot of water. It was spraying close to our shore power connector, which is closed and sealed when we are underway, but we still did not want to be spraying it with warm salt water.
We set up a piece of cardboard to re-route the water into the cockpit floor, which drained easily and never left standing water. That was enough to get us home from Alameda.