I would estimate that it is about 120 feet from the back of the house to the street and that the street is about 10 inches lower than the back of the house. There are small bumps (maybe several inches high) that interrupt the waterflow from both sides of the house from the back to the front. Because the slope is so gradual and because of the bumps, I know that some water will pool at some points near the house. (I just bought it a month ago, and there has not yet been a heavy rain, so I don't totally understand the drainage flow yet. I have run a hose however to get some idea of drainage flows.) If I were to place pipes on both sides of the house and underground, I believe that they would end up beneath the street level. If I tried to level out the surface and get rid of the bumps, I would be afraid that such subtle work would be difficult to accomplish. I am wondering what members of this group would suggest as the best methods to drain the water away from the house.