It is not good to have water in the back. The ancients paid attention to the water behind the mountain, and the end of the dragon branch behind it was the place where life gathered. There is a famous hall in front of it, and the gas storage is surrounded by water, so that it will not leak out, and the left and right dragons, tigers and white tigers will protect it, forming a good pattern of storing wind and gathering gas. Gas is dispersed by the wind, and gas stops when water stops, so water can accumulate gas and block the flow of gas. There is water behind the house, which makes the gas accumulate behind the house, forming a great gas field. The gas can't be conducted here, so it will have a bad influence on the health of people living here, which ordinary people can't bear.
I hope it helps you.