Today Miss Wesley said we would be doing an experiment. She was going to show us what a catchment area was. First we all got a container each because we didn't have a hose. We walked down to the sandpit and made hills and mountains in the sand. (Just so it looked all bumpy.) We laid a plastic sheet over the sand. We sprinkled some sand on the edges of the plastic so it keeps it flat down. Then we raced up to the tap and filled our containers with water. When we were all back in the sandpit we tipped the water slowly onto the sheet. You could see all the water was running down the hills to the lowest point. Some of the water formed lakes. The water flows off the plastic sheet into the sand and forms a river. If we had of kept putting water on it would have flowed to the sea (eventually).