[jnaas2]

If you can get to the drain line where it discharges into the ditch install a bach-flow preventer or as some people call it a check valve. Then when the creek fills up you wont need the plug. You can install a sump pump at the location of the floor drain or in the lowest area in the floor but as you know that will take busting up the concrete. If its installed where the floor drain is you can purchase a pump with a adjustable float so the only time it kicks on is when the check valve wont allow water to flow outside by the gravity drain