« on: 30/12/2022 05:56:39 »
Is Montana the area of very flat ground? Ground water will be a factor, the type of material, wet sand or chalk will allow a greater permiablility of surface water than clay or rock, the height of the site in relation to the local aquifer, the prominence of the site, a hill is obviously more exposed than a valley.We live on a small (~4 km x ~10 km) pretty flat area which is glacial outwash, at the abrupt foot of mountains on the west side of the continental divide; a river is within 10m and ~10m below the heat pump wells. Our water well, ~50m from the river, is ~15m deep. The "dirt" is glacial outwash cobble, from marble to 1m dia size; very little sand, at least in the first 3m; can't remember what the well log said, and I can't remember if the layer below the well water was clay or rock. I think rock, and when punched through it was just more cobble. The surface is extremely porous.