Since the metropolitan area of Paris and London was to be built, the whole city had to be replanned. Because, at present, the expected population capacity of Aurich and Emden is only 20,000 people. Combined, the two cities can accommodate up to 40,000 people.

Therefore, if you want to build a metropolis, you need to expand the size of the city. But there is a problem - in this era, the city had to build walls......

Because, in this era, there are still wars. In order to ensure the safety of the city, it was necessary to build tall walls to protect the safety of the city. Unlike later generations, the city was abolished because of the peace of the world and the ease with which weapons could penetrate the walls.

But this era was different, because there was a threat of war, and the walls could adequately withstand enemy attacks. Therefore, the richer the city, the more it needs to build tall and strong walls.

However, in this way, it is contrary to the development of the city. Because, while the city wall ensures the safety of the city, it also restricts the expansion of the city.

Of course, these are all small things. The biggest problem is that in this era, there are not enough floating populations!

For a city to grow, it must have enough floating population. Why are there so many floating populations in later generations? Because agriculture is mechanized! In the era of lack of agricultural machinery, farmers were trapped in the land, and it took a lot of manpower to sow the plough and harvest. Moreover, in order to cultivate the land, the farmers are very hard, and it is very appropriate to describe it with the phrase "facing the loess with their backs to the sky".

However, with the popularization of agricultural machinery after the 90s, all of them have been mechanized, from ploughing, sowing to harvesting. At this time, the rural population is idle. Because, the family does not need the support of the strong man, and women and the elderly can go to hire machinery to help with the work, and there is no longer a need for the strong man to contribute. Then, there was a boom in migrant workers, and migrant workers crowded the capitals of Beijing, Shanghai and Guangzhou.

However, without agricultural machinery, Marin could not now allow the serfs on the estates to flood into the city and become citizens. Because, that would be a waste of farmland.

After thinking about it, Marin could only rely on recruiting the surplus population of other vassal states to replenish it. Merchants, on the other hand, were attracted mainly from other German regions by good policy. For example, Marin legislated to protect merchants, learning from later Western laws that stipulated that "private property is sacrosanct" and that nobles were not allowed to oppress and extort merchants. In this way, it will be attractive enough for businessmen.

It's just that because of the cost of building the city wall and the limitation of too few floating populations, Marin's idea of building a metropolis with a population of one million cannot be realized. Now Marin has only set a small goal, which is to have a population of more than 100,000 people in the metropolitan area, which is the level of the city of Milan......

Fortunately, Marin now has the technology to manufacture cement and can produce cement in large quantities. As long as the cement production site in Conabrook, Newfoundland, is fully built and starts to burst into capacity, Marin will be able to secure a large supply of cement to build the city more cheaply.

Now, the first thing Marin has to do is fix the concrete road from Aurich to Emden. Moreover, it must be built big enough to be useful.

Previously, due to cost considerations, the experimental cement road in Marin was only 20 centimeters thick and 3.5 meters wide. Such a road can only be said to be barely enough. However, to be used for the main roads of the metropolitan area, it is too narrow.

Therefore, Marin decided to build a two-way four-lane main highway this time. Of course, the width cannot be compared with that of later generations. Later, the width of each lane of the two-way four-lane highway reached 3.75 meters, which was larger than the width of the rural cement road. However, that was because the large trucks of later generations were relatively wide.

But this era is different, and the width of the wheels of horse-drawn carriages is generally more than one meter. Usually the British standard was 1435 mm, which later became the width of the rails.

Of course, tracked and trackless are different. Railcars can travel precisely on the tracks, while trackless cars can easily sway from side to side. Therefore, the width of the highway lane is generally much larger than the width of the body.

Considering that the width of the carriage is generally no more than 1.5 meters, Marin finally decided to set the width of the single lane at 2 meters. If you have four lanes, it will be a total of 8 meters. However, due to the block in the middle, the final width of the road was set at 10 meters. The thickness, on the other hand, is increased to 25 cm. The total length from Orich to Emden is about 20 kilometers. Therefore, the engineering team needed to build a large cement road 20 kilometers long, 10 meters wide and 20 centimeters thick to achieve rapid communication between the two cities.

As for the interior of the two cities, there is no need for these four-lane roads. Moreover, the cost of this kind of road is also a little higher. Marin intends to use two avenues in the city, east-west and north-south, of the kind with a width of 5 meters. On other roads, a 3.5-meter-wide village-grade cement road is built. After all, the carriages were not wide and there were not many of them these days. For general roads, 3.5 meters wide is sufficient. Even, when visiting the city, Marin found a lot of small streets that are only one or two meters wide.

In addition, new cities also need new planning. In addition to the main street that needs to be planned, the drainage system is the most important, and there are also public toilets.

The gutters need to be constructed with cement to facilitate the flow of sewage. As for public toilets, this is very important. Why? Because Marin has to collect the manure of the city population and use it as fertilizer.

Therefore, Marin ordered that the use of toilets be promoted in the city. In addition, it is strictly stipulated that every household needs to dump the feces from the toilet bowl in the early morning of each day in the nearby public toilet. Open defecation will be punished heavily. Then, every day, Marin would arrange for serfs to go to the public toilets in various neighborhoods early in the morning and use a manure truck to transport the manure in the pond. Then, it is shipped to a fertilizer processing plant and processed into fertilizer.

Of course, on the surface, Marin's argument is that the feces stink too much and must be pulled out of the city to be disposed of. As for what to do, that's not a matter for the residents.

And for the sake of secrecy, the serfs of the manure and fertilizer processing factories under Marin were all considered employees of "state-owned units" and were treated well. That is, the usual working environment is a little worse. But Marin also gave them masks to prevent them from being smoked to death. At the end of each day's work, I take a shower in a specially built bathroom at the fertilizer processing plant to wash away the smell of feces.

After several years of management, the city under Marin now has centralized treatment of manure. Therefore, in the cities of East Friesland, everyone can't smell the feces everywhere in other cities, and the environment is much better.

In fact, people in other countries don't know the role of feces, and they think that Marin personally loves cleanliness too much, or has a habit of cleanliness. Therefore, outside, Marin's concentrated cleaning of manure was ridiculed by many princes, thinking that he was a waste of money and food. After all, dispatching a large number of workers to transport manure also consumes a lot. At the very least, a lot of food needs to be consumed to feed those workers.

However, if they knew the benefits of the manure in the ground, they probably wouldn't think so, but would rush to follow suit......

In addition to road planning and centralized manure processing and transportation, Marin also set up an environmental protection bureau to select poor middle-aged and elderly people in the city (not too old) to become sanitation workers and clean the streets. In this era, in addition to ordinary garbage, there is also a very special kind of garbage on the streets, that is, horse manure.

After all, Marlin can prohibit people from defecating in the open, but he can't prohibit live horses from defecating in the open. In this era, horses and carriages were important means of transportation, and there were many on the road. So, it's quite normal for horse manure to appear on the streets. This requires sanitation workers to clean up the horse manure in a timely manner. Of course, according to the regulations, this horse manure must be sent to the public toilet and not put together with ordinary garbage. Because, this horse manure is also fertilizer......

With road corrections, centralized manure disposal, and frequent cleaning by sanitation workers, the cities of the Grand Duchy of the North Sea will be the cleanest in Europe. This, combined with Marin's policy of encouraging business development and preferential treatment of merchants, will attract a large number of merchants to live in Emden, and then, contribute to the economic development and tax revenue of the area......