Because you can't judge whether your home is really against the current, so name a few factors of the water conservancy bureau and judge for yourself.
1, countercurrent can be divided into true and false, which really refers to rivers, highways or main roads, and falsely refers to ordinary roads (not counting rural roads); The real source has a great influence;
2. Against the current, there must be an arch, which means that a river flows from other places, turns around the house, and then flows out in the opposite direction of the house;
If water becomes a pool, it is countercurrent. If it becomes a pool, it is considered to be another bureau (if it is an expressway, it refers to the turntable, and there is no countercurrent with the turntable);
There is little difference between the incoming water and the outgoing water, and it can be reversed. If the water coming in is large and the water going out is small, it will not be reversed.
If you really sail against the current, the threshold of the gatehouse is lower than that of the inner room, isn't it that the gas is pulled faster?
The way to deal with the real adverse current is to close the mirror when removing water and turn the bow when coming water; The way to deal with false sources is to plant trees with five elements to replenish wood and collect moisture, so as to enrich themselves.