Where is the decline level of self-built houses?

In the past, when it rained on the tile house in the countryside, the rain would drip down along the drip tile on the side, so it was called dripping.

Rural users build their own houses, which are generally dripping. Actually, there are rules for dripping water. Normal drip is about 50 cm.

The specific size of drip line for building houses in rural areas is affected by air resistance, wind and other factors, so the water drops fall to the ground with a deviation from the wall size, so the drip line of each household is different.