SKETCHES 1-20. How can lakes exist at elevations above the groundwater table? 1-
ID: 285823 • Letter: S
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SKETCHES 1-20. How can lakes exist at elevations above the groundwater table? 1-22 Why are naturally filled-in lake locations often thought of as areas that offer poor support for building foundations? 1-24. In glacially affected areas, what types of glacial deposits are possible good sources of sand and gravel for the construction industry? 1-28 a. Briefly explain the geological differences between a transported soil and a residual soil deposit. and climatic conditions are deposits? and climatic conditions are formations? b. What combination of geographic, geologic, topographic associated with, or responsible for, transported soil c. What combination of geographic, geologic, topographic associated with the presence of residual soil 1-29. Formations of residual soil typically have strength-related characteristics distinctly different from deposits of transported soils. Briefly describe the significant differencesExplanation / Answer
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1) When referring to how fast surface water moves, hydrologists generally talk in terms of either meters or feet per second. Groundwater moves much more slowly than water in streams, often at rates of only a few centimeters (inches) per day. Groundwater velocity is controlled by the permeability of the aquifer and steepness of the water table (or potentiometric surface). The more permeable the aquifer and the steeper the the slope of the water table or potentiometric surface (i.e., the pressure gradient), the faster groundwater moves
roundwater- the water within the zone of saturation ( a zone deep underground where all open spaces in sediment and rock are completely filled with water)
-The upper limit of the zone of saturation is the water table
-The water table is rarely level- its shape is usually a subdued replica of the surface- it has high elevations beneath hills, low elevations beneath valleys, and swamps indicate the water table is at the surface
-Lakes and streams occupy areas where the land surface is below the water table
-Groundwater is the main cause of the irregular surface of the water table- it moves very slowly, thus water tends to pile up beneath hills. If rainfall stopped, this pile up would subside and slowly approach the level of the valleys. But, new supplies of rainwater are usually added often enough to prevent this.
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