Meant to type 30" concrete cased wells.....they are contructed with 3' tall sections of 30" ID concrete stacked inside a roughly 48" borehole. As for minumums....Virginia just passed new laws for minumum welll yield and storage. A well producing more than 3 gallons per minute needs no additional storage. Wells less than 3 gpm need 150 gallons/bedroom storage per bedroom. I drill mud rotarty wells in the coastal plain. Properly installed screened, gravel packed wells in the Virginia coastal plain generally produce >50 gpm with 20' of 4" screen. The normal residential installation is a 10 gpm pump, and that generally has less than 5' of drawdown, so storage in the well is completely unnecesary.
...the minimum is 1gpm, but it is rather arbitrary...
Cased to within a foot of the rock with no screen, just the bottom of the open casing with crushed stone dumped in to hold back the mud. The formation is clay to within 5 feet of the bedrock, then fine sand/gravel glacial till. It took a lot of work to develop it to where it is now.LLigetfa --- So do you have a screened well, or is it just cased to rock and then open hole?
I'm not a well driller so cannot answer that but will take a stab at it. I don't think they intended it to be a mud well. They originally welded on a drive shoe probably with the intent on setting it into the bedrock in anticipation of it being a rock well. I think they drove down the casing as they went, not knowing the formation until after they passed it. I'm guessing they didn't want to pull up all the casing to add screen to the last 5 feet of it and thought the glacial till would be stable enough to be the screen.
They did not actually develop the well and only pumped it at 5 GPM to satisfy the minimum requirement. After I built the house I put in my 10 GPM pump, it sucked in the mud and I had to get the driller back to flush it out and set the gravel pack. It filled back in with mud again and I augered it out by hand and developed the well myself after the driller did a bunch of no-shows.
This is awkward, but...
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