Well, well, well
Punchline: 3 holes in the ground.
I don't remember seeing the original instalment, but this is what I've got just north of Madrid: 2 official wells; both built from brick; the type with 6 round, through holes instead of a frog on top. These are laid side-on to allow the water through. The wells are 4 m deep; one is 2m in diameter, the other is approx 4m x 10m rectangular. The lowest I've ever seen the water table is 2m below ground; the highest is just above ground. God knows how they built them, or how many people died in the progress. I have a 2hp pump from the wells, and the water level in the wells doesn't even change after pumping out 40m³ of water.
The 3rd "well" is the original plant room for the swimming pool. It is half underground, and in the winter it fills up to the level of the water table due to small pin-holes in the concrete.
On the subject of H&S, you should've seen how they emptied the propane tank of 800L this week to take it away. Admitedly, they did manage to get most of it in the lorry; some just made the nieghbourhood smell funny, and the rest created the largest flame and loudest roar I've ever experienced.