Is there a pond behind the rural building?
The great role of the pond
Over the years, the disappearance of "Hao Qing" in various places has something to do with China's understanding of the ecological environment, which has not attracted great attention from government departments at all levels. For example, the implementation of major projects such as new rural construction and rural land leveling did not really consider that the existence of "Hao Qing" could reduce the frequency of natural disasters in the downstream; Nor did it consider that the existence of "Hao Qing" can make the local ecological environment more reasonable.
In the past, when it rained, the water flowing into Hao Qing was very dirty. Especially after summer, many people will take the smelly "black mud porridge water" in their pigsty to the street, and it will eventually flow into Hao Qing because of the rain. After a rain, the water in Hao Qing was muddy.
But in a few days, the water in the whole "Hao Qing" will magically become clear and crystal clear. It will never be polluted by the "sewage" that people wash clothes here for a long time or wash out from the pigsty. The water quality here can always be kept in good condition. As far as I can remember, except when there is little water entering the pond in winter, it is clear at other times.
To explain this reason, we must start from the time when ordinary people collect farm manure. Before the end of 1980s, farmyard manure was mainly used by ordinary people, and the amount of chemical fertilizer was very small. A farmer has to save at least two or three rounds of farmyard manure a year, so people collect all kinds of weeds or leaves all year round to accumulate fertilizer. In winter or early spring, there is basically no water in Hao Qing, so people will dig out the silt flowing into Hao Qing to pad pigsty.
Because these sludge have the characteristics of farmyard manure, some dark black sludge can actually be directly used as fertilizer. The common people all know that the mud can fertilize the fields, so that the whole "vast" mud becomes a scarce thing for the common people to accumulate fertilizer. Only farmers who have geographical relations with their families can dig mud and accumulate fertilizer here.
Therefore, the sludge here can basically be dug up before next spring, so that there will be "new stubble" at the bottom of Hao Qing, and its infiltration function will be further enhanced. Therefore, even if more sewage flows in next year, these pollutants will sink to the bottom of Hao Qing within a few days, which can completely reach the quality of surface water.