Posted by Ian EN on February 11, 2009 at 11:15:53 user IanEN.
In Reply to: Re: Sitka spruce (was: Four firs) posted by David Bamford on February 10, 2009 at 22:55:18:
misconception that salt water penetrates into the ground around it
can do, with fresh layered over it. I've just grabbed young Nick Chappell who doodled all over my paper - along the lines off :
"Freshwater layers or lenses above saline water bodies are frequently exploited, but there is a risk of drawing saline water into the pumped boreholes. If a partially penetrating pumped borehole is positioned in a fresh groundwater layer, the underlying saline water tends to rise in a cone due to the upward potential gradient caused by pumping (Figure 2.42)."