Lowering of groundwater according to soil report - Your experiences?

Can you still remember how high the costs were regarding authorities and how many days in total you had to pump? You probably don’t remember the cubic meters pumped :) That would still be interesting.

we have had this several times,
then the water flows from the drainage into the basement window wells :oops: .
So we closed the basement window wells, placed the pump in the vertical drainage pipe, and pumped for 2-8 weeks until the groundwater has dropped again.

I would have the pit for the basement excavated and drive 2 lances for suction wells into the ground. The idea with the drainage pipe is good, but I can only imagine it if the pipe is at least 1.2-1.5m below the basement slab.

I discovered an illustration in a technical book that exactly describes my approach. Unfortunately, I couldn't find it quickly anymore. Since the drainage pipe forms a closed loop around the excavation pit, 50 cm is actually enough to keep the ground free of groundwater. Sure, it can happen that water also presses up from below a bit, but due to the good permeability of the soil, it flows relatively quickly to the sides so that no large water column can form. If I work with only 2 probes, I have to insert them correspondingly deep to achieve an appropriate drawdown radius to which the water level drops. I would have some concerns about having to lower too much around the well. I want to cause as little disturbance as possible in the soil.

we pumped for about 4-5 months until the house was backfilled. 30 years ago no authorities costs for that. Today it will be more expensive, whereas a sewer cleaning/flushing by you, my argument would be to save a bit. You also have the water costs if a company does it, plus the rental for the equipment, the labor and their profit.

The costs for water are present in both variants, that's clear. Back then, that was probably still state of the art. Today, it should be doable within 6-8 weeks. Then the basement is usually finished. I just hope we don't overextend ourselves with drainage on our own. The neighboring houses are all only about 6m away and also have basements. A professional company could of course immediately say how it can be done best and safest, but unfortunately nobody has been interested so far...