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<br /> <br />A <br /> <br />B <br /> <br /> <br /> <br />N <br />~ <br /> <br />N <br />~ <br /> <br />o 1 MilE <br />'----' <br /> <br />o 1 MILE <br />'----' <br /> <br />EXPLANATION <br />-590- WATER-TABLE CONTOUR-Shows altitude of water table in <br />feet above sea level. Contour interval 2 feet <br /> <br />Figure 1-2. In Ilood plains of large rivers, such as the <br />Missouri River near Glasgow, Missouri, patterns of ground. <br />water movement (A) and water-table fluctuations (B) can be <br />complex. Zone I is an area of rapidly ffuctuating water levels. <br />zone II is an area of long-term stability, zone 11/ is an area of <br />down-valley flow, and zone IV is a persistent ground-water <br />high. (Modified from Grannemann, N. G., and Sharp, J.M., Jr., <br />1979. Alluvial hydrogeology of the lower Missouri River: <br />Journal of Hydrology, v. 40, p. 85-99.) (Reprinted with <br />permission from Elsevier Science-NL, Amsterdam, The <br />Netherlands.) <br /> <br /> <br />Missouri River Valley, near Atchison, Kansas. <br />(Photograph by Robert Meade.) <br /> <br />alluvium, it was possible to construct a hydrologic section <br />through the alluvium (Figure 1-3), showing that the river <br />receives ground-water discharge from both local and regional <br />ground-water flow systems. In addition, the section aiso <br />shows the effect of the break in slope associated with the <br />terrace at the edge of the swamp, which causes ground water <br />from a local flow system to discharge into the edge of the <br />swamp rather than to the river. <br /> <br />FEET <br />230 <br /> <br />FEET <br />230 <br /> <br />I-BlaCk Swamp Wetland--I <br /> <br />205 <br /> <br /> <br />155 <br /> <br />" , <br />"'" <br />0' <br />.'- <br />,,0: <br /> <br />205 <br /> <br />180 <br /> <br />--------- <br /> <br />160 <br /> <br />155 <br /> <br />~ <br />-( <br />Regional flow <br /> <br />Sand and gravel <br /> <br />130 <br /> <br />130 <br /> <br />DA rUM 15 SEA LEVEL <br /> <br />o <br />, <br /> <br />0,5 <br />, <br /> <br />1 MILE <br />, <br /> <br />Ffgure 1-3. The Cache River in Arkansas provides an <br />example of contributions to a river from regional and local <br />ground-water flow systems. In addition, a small local ground- <br />water flow system associated with a terrace discharges to <br />the wet/and at the edge of the flood plain. (Modified from <br />Gonthier, G.J., 1996. Ground-water flow conditions within a <br />bottomland hardwood wet/and, eastern Arkansas: Wetlands, <br />v. 16. no. 3, p. 334-346.) (Used with permission.) <br /> <br /> <br />Cache River, Arkansas. (Photograph by <br />Gerard Gonthier.) <br /> <br />41 <br />