Recommendations for a garden pump to empty a shaft

This is a picture of the shaft from Saturday. At that time, nothing had yet emerged at another location. Currently, the water is just below the orange pipe. However, there is already a lot of water next to it at a deep spot (Image 2).

That means, you have two basins. One in the concrete cistern with the overflow pipe and the other one next to it, unlined, in a hole in the ground? So the water is pressed into this open hole in the ground despite the cistern? Hm..... I’m less familiar with how you can fix that. You should plaster the red pipe a bit so the water only flows into the overflow. Then I would regulate it with a domestic water system but ALWAYS and ABSOLUTELY put a lid on the cistern. Oh dear..... just be careful with that...... children and that kind of water....!!!!!!!!!!!!!!

If the shaft is not so full, there is no water in the earth hole basin. Actually, no water should come up there in the first place.

I want to pump the shaft empty tomorrow and see if the water from the earth hole then evaporates quite quickly.

How do I best coat the red pipe? Like, with what is best? The earthworker said that was okay ... But I can manage that.

1. Test, when you pump out the shaft, does the puddle empty? 2. Do you have sand or clay soil? 3. Where does the overflow lead? 4. When you pump into the overflow, do you hear water rushing in the wastewater inspection shaft? 5. Do you have mountains around you or flat land? 6. Was there swamp grass, a pond, or muddy soil on the empty building site?

2. Clay soil
5. Rheinhessian table and hill country
6. No mud, pond or similar. Soil sample also showed nothing special. The earth below the topsoil was soaked with water. The earthworks contractor pumped out the construction pit in the evening, in the morning there was a small pond in the depth again.

Hopefully I can answer the other points tomorrow.

I would find it difficult to take measures without knowing the origin of the water. I'm not a hydrologist or anything similar, but if large amounts are pumped away quickly, it can cause quite different problems. Groundwater layers, etc., will keep flowing back in – and possibly lead to unintended other effects (maybe even much more will flow back because water is lazy too and takes the path of least resistance). Otherwise, in a similar setup (rainwater from the roof), we have a sewage submersible pump from Homa. It is absolutely reliable and practically inaudible.