Doomsday Bunker Upgrade

If the water supply in the urban area is still smooth, Chen Xin can find a way to get a water pipe from his original home and add water to the water tank. When the shelter was built before, he used the long water pipe connected by the construction team to add water. of.

But now, on the one hand, the construction team has left, and Chen Xin does not have a long enough water pipe. On the other hand, Chen Xin is not sure whether tap water is still available.

In the month after the meteorite hit, the earth's surface was almost completely covered by fire and high temperature, and meteorites fell from time to time. Whether the water plant can survive such a disaster is a matter of concern.

What's more, even if the water plant can be preserved, the government is maintaining the operation of the water plant in order to ensure the water supply of the shelter facilities, but how will Chen Xin fill the water tank of the shelter?

Water pipes? Chen's novice doesn't have such a long water pipe, and only a bunch of 1.5-liter mineral water bottles can be used.

Maybe some people will say that it is not enough to bottle the mineral water, but it is a big deal to pack a few more bottles!

That's right, but before you bottle water with mineral water, let's briefly explain the relationship between the volume and weight of water, that is, the density of water.

The density of pure water should be 1 in standard state, that is, one liter of water weighs one kilogram, and one ton of water has one cube.

Chen Xin's water tank can hold three tons of water, that is, three cubes. He has 30 1.5-liter mineral water bottles in his hand, that is, if they are fully filled, they can transport 45 liters and a total of 90 kilograms of water, which is about equal to a girlfriend's. weight.

Without considering Chen Xin's physical fitness or time, how many round trips are required to fill the water tank?

This is not a difficult problem, and all first-grade students who have learned addition, subtraction, multiplication and division can solve this problem.

A water tank with a total volume of three tons, converted into liters, is three thousand liters. Chen Xin can transport 45 liters at a time. After a simple division calculation and simple rounding, we can conclude that Chen Xin needs to go back and forth at least 67 times to fill him. 's water tank.

This is really not a number that can make people feel calm. Who can pick up his girlfriend and run back and forth 60 times at a time?

If it was ten or eight times, Chen Xin would not think about it, just go out and find a faucet or a clean water source that can be used now, and the irrigation will be done.

But sixty-seven times, this is really the number that makes Chen Xin have no desire to act.

It may be possible to replenish in several times, but the premise is that Chen Xin can find a stable source of water.

So at this time, he should consider the second option, use the system to upgrade the water circulation system of the shelter, and see if he can find a solution.

The reason why this solution was not considered at the beginning was because the system cannot be created out of nothing, and the existing things must be upgraded.

Chen Xin's shelter itself has no water source, whether it is external tap water or a well inside, which was not prepared when the shelter was built.

At the beginning, Chen Xin did consider drilling a well for the shelter, so that even if he used up the pure water reserves, he could still obtain new fresh water resources.

It's just that when the shelter was built, the construction team that Chen Xin invited did not have well drilling equipment, and he did not contact the construction team that could drill wells.

The city where Chen Xin is located is located in the south of the Yan Kingdom and is close to Daze. The groundwater resources are very rich. In the past, there were indeed many hand pumps for extracting groundwater in the countryside.

But during the previous construction, due to the construction period and the lack of contact with the construction team, even though Chen Xin wanted to build a well for his shelter, he could only give up the idea.

Now that Chen Xin wants to upgrade the water supply system of the refuge, whether there is an upgrade plan that can exploit groundwater, this is what Chen Yu is not sure about.

However, when he thought that he would have to run sixty-seven times to find water outside, Chen Xin could only bet on whether there was something he needed in the system upgrade plan.

Fortunately, the survival system he picked up did not disappoint Chen Xin.

"Water-scarce water supply system"

"Upgrade plan 1: Upgrade the material of the water supply system pipes, improve the efficiency of sewage recycling and regeneration, the volume of the water tank is +2 cubic meters, the regeneration water quality +1, and the required survival points for the upgrade are 500"

"Upgrade plan 2: Upgrade the material of the water supply system pipes, improve the efficiency of the water recycling system, increase the water pump, the water tank volume is +5 cubic meters, and the survival points required for the upgrade are 300"

"Note: The available head of the water pump is 50 meters. This pump is only used for pumping water. Based on the refuge, the groundwater cannot be obtained if there is no groundwater layer within 50 meters of the ground."

Seeing the appearance of a water pump in the upgrade plan, Chen Xin immediately breathed a sigh of relief. As for the remarks about the upgrade plan two, Chen Xin just glanced at it and didn't care.

This is the southern part of the Yan Kingdom, known as the Jiangnan Water Town. This city is next to Yunmeng Daze, and the groundwater is rich beyond imagination. When Chen Xin built the shelter, he also specially considered waterproofing and water resistance. Avoid digging into groundwater.

As for whether there is groundwater 50 meters underground, this is something that Chen Xin does not need to worry about at all, because the place where Chen Xin lived before used to have a well with a hand pump, but it is now abandoned.

Chen Xin didn't think much about it, and directly used the survival points accumulated in this month to open the upgrade of plan two.

The upgraded grid of lights once again appeared in the shelter, only this time they covered the water system.

And Chen Xin once again witnessed the power and magic of the system, because in the process of upgrading just now, Chen Xin saw with his own eyes a pump formed by grid-like light, condensing and forming in front of his eyes.

Seeing the appearance of the water pump, Chen Xin didn't care to sigh at the magic of the system. He checked the wiring of the pump and went to the power distribution room to look at the switch. Then, he turned on the power of the water pump and let the water pump start working.

It's a small pump, not very powerful, but it still hums when it works.

The noise from the working of the water pump is a bit loud, and it looks like a noisy child compared to the generator next to it, but at this moment, Chen Xin is staring at this "bear child" nervously, hoping to hear the flow of water from the roar of the machine. sound.

Although he knew that there was groundwater underground, Chen Xin was still a little nervous. What if the water layer was a little deeper?

But "Bear Boy" obviously didn't let Chen Xin think about it for too long. Just when Chen Xin was thinking about what to do if he couldn't pump water, there was a rushing sound of water in the pump, and the sound of the pump running soon stopped. It sank suddenly, and the sound of water also sounded in the water tank that had more than doubled in size and was embedded in the wall.

Water, pumped up.