Pond Boss Forums INTRO Questions & Observations 1/16th of an Inch at a time.

Dave,

Are you sure Jeff's spring water does not already have some oxygen in it? I say that because I can't imagine it would get up to 6 mg/l almost instantly even with higher D.O. around it.

The trout farmer I referred to in Harrisville, Michigan, that also gets his ground water from limestone rock maintains it already has oxygen in it right out of the ground. The only thing I can think of is there must be cavities in the limestone e.g. caves, sinkholes that aerate the water due to splashing and air cavities or expose it to open air. Is that possible?

Another trout farmer I know in Ohio has incredible artesian well flow and gets it out of a well punched through a confined layer or limestone. I don't know if he has any D.O. in his well water but he does aerate.

Good morning, Cecil! Did you ask "are you sure?" Of course I'm not sure!

Seriously, all I ever learned in school about this entire situation was that "ground water has no oxygen." However, as we typically find, it just seems that things are never as simple as "ground water has no oxgyen." That's the entire point of Dwight's interest in the ground water.

I suspect what we'll find is that exceptions happen, just like the examples you listed.

It depends. Some GW has O2 some does not. The best rule is to always assume GW has no O2. That is IMO why it is almost universally stated that GW has no O2. In my experience the vast majority of GW has little to no O2 as it has dissipated from the formation that contains the water. If the formation has a confining seal then gases can be trapped and under pressure infused into the water or liquid. Temp and pressure effect the form of all substances (ice , water and steam). Also recall that chemistry is at work in the process ( water on limestone or sandstone , air and water on iron , etc) and that can be a big concern as to water quality

You Geologists need to explain all this stuff !

Finally got internet service back. It's been off for 36 hrs. No idea why.

My pond has dropped about 10" in the past week with no well water going into it. It's now as low as it was back in 2008 after the renovation. The well has been turned back on. Hopefully it won't drop any more. 4.5 feet below full pool now.

I took a reading on my well water (from 66' depth) and the DO was .21 mg/l right out of the 2" pipe. Just flowing thru a 20' piece of 4" pipe that was open on both ends increased the O2 to 2.2 mg/l.

I hooked up the test well and pumped it for 24 hours. That is roughly 24,000 gallons through a garden hose hooked near the pump. The water pumps clear and there is no sediment in the test beaker after sitting for 24 hours. We have a good well.

I took a sample without letting the water touch air and put it in a dark room where the D.O. meter resides. After acclimation and calibration I took a reading and found: water temperature 72.2 F, DO 2.55. I am going to keep this sample for a few days and then check it again to see if there are any organisms at work in the water that cause the readings to change.

I need to take samples directly at the well and will, but have some work to do to make that a less problematic operation.

Sucking water: