Population genetics. Population genetics is a subfield of genetics that deals with genetic differences within and between populations, and is a part of evolutionary biology. Studies in this branch of biology examine such phenomena as adaptation, speciation, and population structure.
In the fluid-filled case, the wellbore is presumed to be full of either all liquid or gas which gets compressed as afterflow continues into the wellbore. The wellbore storage constant (C) is a function of the wellbore volume (Vw) and the wellbore fluid compressibility (cwb) as shown below: For a fluid-filled wellbore:
Ozarka natural spring water contains 0.07 to 0.088 ppm fluoride according to the Ozarka Bottled Water Quality Report (PDF). Interestingly, they also show that their fluoridated spring water contains 0.77 ppm fluoride. Poland Spring. Poland Spring bottled water contains 0.075 to 0.17 ppm fluoride according to the Poland Springs Water Quality Report (PDF). They also state that their fluoridated brand of spring water contains 0.86 ppm fluoride.