ᐅ Experience with Building a 600-Meter Water Service Line?

I do not have a connection to the public drinking water supply at home (instead, I use a spring and a well). Now, the electricity grid operator has planned a new power line and has offered to lay a (private) water pipe in their trench. The water supplier offers me a connection to their public network about 600 meters (660 yards) from my two-family house (from there, my private water supply line would start). There are a few minor challenges—perhaps someone here has experience and can offer advice on the following aspects:

• The energy grid operator digs 80 cm (31 inches) deep, while the water supplier usually digs 100 cm (39 inches). I assume and hope that 80 cm (31 inches) is frost-proof here in the Rhineland.
• The private line contains about 600 liters (160 gallons) of water. How can I ensure a minimum flow rate so that the water does not stagnate in the pipe?
• The water meter is far away. If a leak occurs along the 600-meter (660-yard) pipe and I read the meter six months later, I will probably face bankruptcy. Fortunately, we do not have a sewer connection and therefore no wastewater fees.
• The energy grid operator is allowed to lay their lines on public land, but I am not. What kind of permit do I need (from the city) if I use the same trench? (Of course, I will ask the city about this.)

I believe pressure will be more of an issue.
To save costs, we wanted to deviate from our connection point located 49m (54 yards) away and switch to a "private line" of nearly 150m (164 yards).
However, according to the water supplier, this would require oversized pipes and peripheral components above ground, which is not cost-effective in the single-family home sector.

Ask again here whether the minimum pressure requirements can be maintained at 600m (656 yards) and which pipe diameter they are referring to.

Malunga schrieb:

I think pressure will be more of an issue.

True, but not in the way you might expect. One of the supplier’s first pieces of information was, “You’ll need a pressure reducer.” The supplier delivers with a line pressure of 8 bar (116 psi), my pressure is somewhat lower, and according to their calculation, I would have about 8.5 bar (123 psi), which wouldn’t be ideal for my pipes or household appliances. My current pressure regulation (located after the well pump and the pressure tanks) manages between 2.5 and 4 bar (36 to 58 psi), so with my new pipe, I should be able to easily maintain that range without any problems.

That contradicts itself. Even if you were 5 meters (16 feet) deeper, your pressure loss in the 600-meter (1,969 feet) long pipe would be zero.
And an increase from 50 to 150 meters (164 to 492 feet) is supposed to be extremely expensive above ground?

DN25 100 meters (328 feet) cost 129 EUR, DN50 costs 565 EUR. Well, that is four times the price. But the other work stays the same. The excavator doesn’t care whether it digs the trench for a DN25 or a DN50.

@xMisterDx it looks like you’ve probably mixed up two lines (from @Malunga and me)?

I am referring to the contradiction clearly shown in both of your posts.
There, 150 meters (490 feet) instead of 50 meters (164 feet) is not possible because it is significantly more expensive...
But 600 meters (1,970 feet) is no problem, and there is hardly any pressure loss, even pressure increase.
Because even with a DN25 (1-inch nominal diameter) pipe and 0.5 liters per second (about 8 gallons per minute), the pressure loss is “only” 5.4 millibar per meter (0.23 psi per foot). This decreases drastically with a DN50 (2-inch nominal diameter), and honestly, 30 liters per minute (7.9 gallons per minute) is already quite a lot— a regular showerhead uses 12–15 liters per minute (3.2–4 gallons per minute).

But no pressure loss at all is definitely misleading. With a DN25 at 600 meters (1,970 feet) and 0.5 liters per second (8 gpm), the pressure loss is actually 3.24 bar (47 psi).
Are you really about 40 meters (130 feet) underground? Or was something larger assumed?