There are walls around the fang, four doors are opened, and the fang is equipped with cross streets. Cross streets and smaller cross streets divide the entire fang into sixteen districts. The fang implements an inspection system and is strictly managed. Commercial transaction activities are limited to the east and west cities that are also closed.

This kind of planning to set up palace cities and government offices in the northwest corner of the city, adopting a square layout of lifang was mostly adopted by local prefectures and counties at that time and even later generations.

The area of ​​large and medium-sized prefectures and county towns is generally equivalent to the area of ​​the sixteen fangs, four fangs or even one fang in the capital, and the layout is roughly the same, that is, one door is opened in the middle of each side of the roughly square city, and the city is divided into four districts by cross streets, and the number of fangs in each district varies according to the order of prefectures and counties. In each district, small cross streets and smaller cross streets are also set up. The planning of cross streets and alleys is one of the characteristics of the layout of city sites in the Sui and Tang Dynasties, reflecting the unique urban form of the period when the feudal hierarchy was strict.

It is also clear enough, at least far better than the messy layout in the past, and the various infrastructures can be proportional and built according to the number of stores.

I can only admire this architectural pattern, and the current population of Chang'an City is not large. In the ninth year of Daye, the Sui Dynasty, the Book of Geography records: Jingzhao County had 300,8499 households, and each household had a population of more than five people. Even if it was calculated based on 5.5 people, the population of the entire Jingzhao County was 1.69 million.

The Sui Dynasty established Jingzhao County, which was established as a county-level system to govern more than 21 counties including Chang'an and Daxing. In the ninth year of Daye, the population of Chang'an City had reached 500,000. In addition, the natural increase over the years, and the chaos in the world, only in the general environment of Guanzhong'an, the permanent population of Chang'an City increased day by day.

But even so, there are still many places empty, so these are naturally for the purpose of giving them to princes and grandchildren, princes and nobles as rewards in the future.

Now that I am here, I naturally want to use these territories to make a big fuss or replace them. At present, hospitals, tax offices, primary and secondary schools, theaters, and public toilets have been established in the eight fire squadrons in the locations of these eight markets.

Well, the two institutions that have been established are fire squadrons and tax offices, and the others are still recruiting personnel for preparation and construction. However, I am planning to build one of the public toilets in every yard. No one wants the magnificent and majestic historical city like Chang'an to be full of yellow lumps or beaches of dirt everywhere in the streets and corners of the walls.

It would be too strange to dig out a mass of feces fossils when excavating and researching Chang'an City less than a few thousand years later.

All the public toilets flow into the unified sewage treatment system of each workshop, namely the septic tank. I made it out before the farmer saw them repair the house, and asked the technicians from the town to give guidance. Anyway, it was a bit similar to the biogas tank. This was what the technician said.

As early as Hancheng County, I designed the drawings of the three-cage septic tanks in later generations and handed them over to the construction workers to build them. The so-called three-cage septic tank is composed of three connected pools, connected by a manure pipe in the middle, mainly using anaerobic fermentation. The proportion of the middle layer of manure and parasite eggs is greater than the specific gravity of the general mixed liquid and is easy to precipitate. The feces are fermented and decomposed in the pool for more than 30 days. The middle layer of manure flows from the first pool to the third pool in turn to the purpose of precipitation or killing parasite eggs and intestinal pathogenic bacteria in the feces. The manure in the third pool becomes high-quality fertilizer.

There is no way. There is no chemical fertilizer in this era. Only farm fertilizer can be found. The farm fertilizer in this era is often very incomplete, so the fertility is insufficient. Moreover, the parasitic eggs and intestinal pathogens in the feces are not yet fart, which may cause reinfection of the disease.

Therefore, when Hancheng County built these septic tanks on a large scale, people often complained, but when the results came out, the guys cried and shouted that they could help build such a game at home.

Nowadays, every household in this era uses toilet buckets, that is, night fragrance, and someone will come to collect them specially. Now, there is no need to be so troublesome. They are poured into the septic tanks of each workshop. Only two staff members need to be busy, so that the entire workshop area can be clean and clean.

And the public health system is naturally not just these. After this young master established his capital, he began to dig deep and hard in Chang'an City, and naturally he was following the example of Hancheng County to build sewer projects.

Sewers are a kind of urban public facility, which appeared as early as the ancient Roman period. The prototype of modern sewers originated in Paris, France, and Paris still has the largest urban sewer system in the world. Generally speaking, sewer systems are used to collect and discharge domestic wastewater generated by cities, industrial wastewater generated by industrial production, and rainwater.

The most magnificent sewer in the ancient world was the Maxim sewer in Rome. Ancient Rome was extremely skilled in public facilities and was proficient in building public facilities. By 315 AD, there were more than 140 public toilets in the city of Rome.

Even the social Romans developed public toilets into places for entertainment and leisure. Like public bathrooms, people could gather in public toilets and engage in natural behaviors such as chatting with neighbors, planning gatherings, discussing politics, or contacting business.

Anyway, I can't believe that some people regard public toilets as entertainment venues. If it is a bathhouse, it's almost the same. However, from this point of view, the ancient Romans were indeed very good at socializing, and they could brag and spank happily even if they squat in a hair pit.

Yes, when I read world history in later generations, I studied ancient civilizations quite carefully. The ancient Greeks had profound attainments in many aspects such as philosophy, history, architecture, science, literature, drama, sculpture, etc. After the demise of ancient Greece, this civilization heritage was destructively continued by the ancient Romans, thus becoming the spiritual source of the entire Western civilization.

Moreover, in terms of public facilities, ancient Rome surpassed its predecessors. The proportion of public buildings in ancient Rome was amazing. There were a large number of colosseums, bathhouses, theaters, libraries, public spaces and markets. The use of these public facilities was free in most cases. All urban enjoyment was provided by the city. The ancient Rome not only provided citizens with "city space", but more importantly, it provided "public life".

In contrast to the long medieval era, ancient Rome can be said to be a truly "city of citizens". On the other hand, Gentiles or subordinate provinces only had a powerless sense of worship of ancient Rome. The high level of urban construction and social life in ancient Rome was completely unimaginable in that era. "City" made every Gentile feel shock - the shock of architecture, the shock of pictures, the shock of urban life and culture. "When the Colosseum stands, Rome will also exist" - any enemy of ancient Rome will agree that Rome is invincible and dare not have any rebellious intentions against brutal rule.

Ancient Roman cities were a spatial media with discourse power, which made citizens in the city crazy and scared the enemies outside the city. For the first time, ancient Rome showed the charm of urban civilization in front of the wild world - population gathering is not a real city, only space and public life are hugely prosperous. The power that makes citizens cheer and shocks outsiders is the foundation of the concept of the city and the secret of the ancient Romans making the city great.

However, what I admire most about these Western barbarians was their drainage system. The Romans built the most magnificent sewer in the ancient world, which was the Maxim sewer built by the Idalarians for Rome in BC. The Idalarians were prosperous in central and northern Italy in the 8th to 6th centuries BC. The prosperity of Rome made them eventually absorbed into the Roman Empire.

Around the sixth century BC, the Idalaris dug the sewer that was discharged into the Tiber River, which was over 16 feet wide, and then expanded it by the Romans. Seven branches of the sewer flowed through the city streets and eventually merged into the main Maxim sewer. When the storm came, the sewer was cleaned by the huge impact of running water. Roman scholar Pliny praised it as Rome's "most eye-catching achievement". Until more than 2,500 years after its completion, the sewer was still in use in Rome in the 21st century.

On the land of China, even in the 21st century of modernization, our drainage system is a luxury that we dare not have. The newly built road sections that can be seen everywhere in the city, even the sidewalks with just paved floor tiles, may be dug up the next day.

Why? It is naturally to facilitate the production and life of the people. What a warm and nonsense reason. Under the sidewalk, many horizontal pipelines belong to various management departments. They do their own things in construction and maintenance, and are messy and wasteful. I often see the same section of the road being dug up and buried by this department, and soon they are dug up again by another department.

China's drainage system was not learned from the West, but learned from the drainage system built by the Soviet elder brother, and then copied to the land of China. This kind of drainage pipe is probably specially for people to climb. Anyway, I have never seen anyone dare to get in. Even in the city I lived in, I saw drainage pipes that were not much thicker than my waist. The impact of such a small diameter drainage pipe is that in our area, it is as if it is light rain, and heavy rain is as a swimming pool.

I remember when I saw the news broadcast that Beijing was flooded. At that time, I finally felt a sense of accomplishment. I didn’t expect that Beijingers would have the same experience as people from small towns like me.
Chapter completed!