Take a look at these pictures. I told the people at Niblock Homes, who built the house, that the drain at the rear of the property wasn't working. No one listens. Niblocks warranty man, Dave Robinson, came by the house and took pictures to show to the developer. Although there is a swale at the rear of the property I don't think the developers thought about the fact that the rain drains downhill from the left and the right, as well as directly from the higher level land to the rear.