SWS 2007 Lecture Notes - Lecture 10: Ogallala Aquifer, Nubian Sandstone, Fossil Water
10 Apr 2017
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Unconsolidated aquifers- individual particles: granular sand, gravel, clays, silts. Water held in pore spaces between grains of sand, gravel, clays, or rock fragments. Erosion of the rockies provided sediment that filled ancient channels. Aquifer material dates back 3 to 6 million years. Saturated thickness ranges from a few feet to more than 1000 feet. 27 percent of the irrigated land in the united states overlies this aquifer and yields a(cid:271)out 30 pe(cid:396)(cid:272)e(cid:374)t of the (cid:374)atio(cid:374)"s g(cid:396)ou(cid:374)d (cid:449)ate(cid:396) used fo(cid:396) i(cid:396)(cid:396)igatio(cid:374). Water held in cracks, fissures, erosion cavities and seams in solid rock formations. Sandstone is a cemented form of sand and grovel. Exhibit mostly secondary porosity due to fracturing and dissolution openings. Wo(cid:396)ld"s la(cid:396)gest fossil (cid:449)ate(cid:396) (cid:396)ese(cid:396)(cid:448)e, t(cid:449)o (cid:373)illio(cid:374) s(cid:395)ua(cid:396)e kilo(cid:373)ete(cid:396)s. Equivalent to the flow of 200 years of water in the nile river. Water between 14,000 and 35,000 years ago. The largest underground network of pipes in the world, 1300 wells more than 1500 ft deep.
