Ok heres how to get rid of the rats. This trap works well and i've got rid of a few infestations this way. Cut a metal or plastic 55 gallon drum length way so that you get sort of a trough. Drums are cheap, but you could use anything you have on hand. An old watering trough or bathtub would work just as good. Lay it on it's side, open side up and drill a hole in each end of the drum centered about an inch down from the top. Get a 1/2" piece of pvc pipe (it's cheapest, copper would also work, but not iron as its too heavy). Cut the pvc so that it is 16 inches less than the length of the drum. Now you will need a good stiff wire. I like to use some household bare solid copper grounding wire, but you could also get by with some rope or bailing twine in a pinch, even a piece of rebar would work. Tie the wire to one of the holes you drilled and then run it through the pvc pipe, and attach it tightly to the hole on the other end of the pipe. So now you have a pvc pipe suspended above the empty barrel. Screw or hot glue a piece of wood or cardboard to the pvc pipe. The piece needs to be about 6 or so inches long, and about 3 or so inches wide. a 6" piece of 1x4 works great. Screw it so that it is perpendicular to the pvc and centered. Place some peanut butter on both the top and bottom of the board. Lastly place the trap where you want to catch the rats at, put about 6 inches of water in the bottom of the barrel, and lay a board like a ramp from the ground up to the center of the barrel on one side (not the ends). The rats will smell the peanut butter and go up the ramp. At the top they will smell and see the peanut butter on the board, but they wont be able to reach it, so they will attempt to hop to it. When they land on it, the pvc pipe will spin on the wire, dumping them into the water below. Because of the water the rats can't jump out of the barrel and will be trapped. Empty daily, and refresh the peanut butter. This is the basic idea, you can adapt it to whatever materials you have on hand. You could use a 3/4" piece of pipe and then use a piece of rebar instead of the wire etc.