By RYAN LANCASTER
Staff Reporter
It's widely known that the underground body of water that supplies fresh drinking water to Airway Heights, Medical Lake and Four Lakes has been in decline for years.
The aquifer's subsurface geography has so far been extremely difficult to map, but research suggests basement rocks with a very low permeability, such as granite, are acting as a barrier to groundwater recharge, which is limited to between 15 and 19 inches of yearly rain and snowfall.
Precipitation is though to flow between thick layers of basalt that sit on top of the basement rock, forming small,...
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