Elaine Harmon wrote: > > On Mon, 30 Aug 1999 Outfit3029_at_aol.com wrote: > > I > > am supposing that the science is this, the water table at sea level is high, > > the salt water is heavier than the fresh water. The first water entering the > > well is fresh, but before long the salt water intrusion takes over. > > Interesting! What kinds of places have these fresh water deposits > (lenses?) close to the shore? Is it common? This only works where there is a *very* high water table inshore -- maybe a couple of feet below ground level, such that when the tide is very low, there is a substantial "downhill" slope from the (fresh) water table surface to the (salt) water surface. I'd guess it works well in the winter/spring/early summer in wet places like the coast of BC, WA, OR, and the like. Probably not workable in late summer in those regions. Under exceptional circumstances it might work in a tropical region where there is substantial annual rainfall and no local easy route for the water table to "leak" to the sea. In other words, no stream or tidal slough. Where I live, there is a humongous aquifer located in some 45 square miles of sandy deposits adjacent to the Columbia River, which "renews" itself every 6 years or so, due to our 6 feet (sometimes 8 feet) of rain annually. Despite the favorable circumstances, some of the water wells drilled in this aquifer produce nasty sulfur/iron saturated water. YMMV -- Dave Kruger Astoria, OR *************************************************************************** PaddleWise Paddling Mailing List Submissions: paddlewise_at_lists.intelenet.net Subscriptions: paddlewise-request_at_lists.intelenet.net Website: http://www.paddlewise.net/ ***************************************************************************Received on Mon Aug 30 1999 - 09:26:50 PDT
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