Skip to main content

Rice Paddy, Are the Dams in the Plain

Modern rivers have become large drainage channels. The rain that falls on our living area is pushed away from the drains into the rivers as an obstruction.

This is because there is no more space for the rain to soak into the soil in our living areas. The result of forgetting to return the rain to the ground is the excessive amount of water flowing into the rivers, and when the limit is exceeded, the rivers overflow and flood the city. 

This is not good, so we have raised the sides of the river and armed them with concrete to prevent the water from overflowing. It can be said, a forceful flood control. Hence, when the overflowing; limit is exceeded, we have to accept the enormous flood damage.

River overflows are caused by narrow, shallow, or slow-flowing rivers. But what I think is important is the amount of water flowing into the river per unit of time, because if it is too large, the river cannot handle the amount of water flowing into it, and it will easily overflow.

The key to flood control is how to reduce the amount of water flowing into the river per unit of time.



The Power of Rice Paddies

The rice paddy is a wet field for harvesting rice, and usually, a large amount of water is filled into it.

Most of the water supplied to rice paddy comes from rivers, but river water is usually contaminated due to the influence of human life. The river water supplied to the rice paddy slowly seeps deep into the ground, supplying organic matter to the soil. The infiltrated water is purified and joins the underground water veins.

This is similar to the principle of a slow-sand-filtration for obtaining purified water. The rice paddy functions as a biological device for purifying river water, and at the same time, by supplying purified water underground, it preserves the underground water veins and prevents ground subsidence.

In any case, rice paddy can hold a huge amount of water there. Even with the addition of water from the rains, the rice paddy can penetrate the water into the ground, thus keeping the amount of water constant. This means that water from rivers or rain can be stored in the rice paddy. It is as if the rain is stuck to the earth. 

Even though it is not clear how much water the rice paddy hold, there is no doubt that it is a huge amount. In this sense, we can say that rice paddy is a “dam”.



The flood control mixed natural power

To prevent overflow from rivers, it is important to reduce the amount of water flowing into the river per unit time.

Dams in the upper reaches of rivers play a role in this. Rainfall in our living area is just pushed down into the river, so without dams upstream, the amount of water flowing into the river would be enormous and could easily exceed the limit.

From the perspective of flood control, it is desirable to have dams in our living areas, too. A practical solution is to set up rice paddy around the rivers. Normally, we can use the river water for irrigation, and it is expected to purify the water. When it rains, the rice paddy will hold water as long as they can. If the river were to overflow, the area would become dangerous, but since the paddy fields are uninhabited, what will be lost is the rice that was to be harvested, not human life.

Another practical measure to reduce the amount of water flowing into the river per unit time is to use rainwater tanks. These tanks can be placed at the sides of homes, schools, gymnasiums, etc. to store rainwater. The water is not suitable for drinking, but it can be used for gardening. In case of emergency, the water can be used for daily use by removing impurities with a filter.


I hope the world will continue to be a peaceful place where Noah's Ark is not needed.

Labels:

Comments

Post a Comment

Popular posts from this blog

The Sealer-Puff After the Root Canal Obturation, the Relationship Between Root Canal Irrigation

  The sealer-puff is a characteristic appearance of sealer overflow outside the apical foramen on the confirmatory dental photograph after root canal filling.  This is caused by a small amount of sealer overflowing outside the apical foramen when the dentists pressurize the area around the apical constriction to achieve a tight root canal filling. It is also caused by sealer penetrating the lateral branches of the apical-delta due to pressure at the apex. The sealer puff is, after all, an overflow of foreign material into the periapical tissue of the root apex. Of course, dentists must always try to prevent foreign material to overflow from the root apex into the apical periapical tissue. However, if we take into account the cause of sealer puffs, we can evaluate them from a different perspective. Sealer puffs are... The area around the root apex is properly cleaned and free of debris, ensuring the patency of the root canal. And Be caused by the application of a good flow of s...
Post a Comment
Read more

The Agitation for Root Canal Irrigation

 An important aspect of root canal cleaning is just disinfection, especially at the root apex. This consists of removal of the smear layer of the dentinal wall and disinfection with sodium hypochlorite solution in the apical delta. Normally, dentists perform positive pressure irrigation using a syringe for root canal irrigation. They use saline solution, hydrogen peroxide solution, EDTA, or sodium hypochlorite solution as the cleaning solution. If the needle is thin enough to rinse deep into the root canal, dentists will usually feel that can clean the root canal. However, the reality is that the cleaning is not satisfactory. This is because only positive pressure irrigation makes it difficult to exert the chemical action of the irrigants. In particular, a narrow path such as the apical delta is difficult for the cleaning solution to reach. Therefore, it will be necessary to use some other method in addition to positive pressure washing. The agitation of root canal irrigation is. T...
Post a Comment
Read more

Are Kurds Refugees?

　 This article is not related to my usual dental practice. Recently, Kurds have been causing problems in Kawaguchi City, Saitama Prefecture, Japan. The Japanese mass media has not reported on this at all, but Japanese people who lived in Kawaguchi City have reported the situation vividly on Twitter. There is a growing sense of anxiety among the residents.  These Kurds have applied for refugee status in Japan, claiming that they are Turks, but they are persecuted in Turkey, so they have come to Japan as refugees and are asking for help. However, we know that they entered Japan as Turkish tourists and applied for refugee status as Kurds as soon as their tourist visas expired. By the way, about 600$ per month is provided from taxpayers' money as protection money. Generally, Japanese people do not discriminate against foreigners, but we do not like criminals who disrupt social security. The Japanese are equally averse to criminals, whether they are fellow countrymen or foreigners. I wo...
Post a Comment
Read more