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08/8/00 <br />WATER FEATURES <br />1 Endnote -- WATER FEATURES--Continued <br />Information on the extent of flooding based on soil date is less specific than that provided by detailed engineering <br />surveys that delineate flood-prone areas at specific flood frequency levels. <br />High water table (seasonal) is the highest level of a saturated zone in the soil in most years. The depth to a <br />seasonal high water table applies to undrei ned soils. The estimates are based mainly on the evidence of a saturated <br />zone, namely grayish colors or mottles in the soil. Indicated in this report are the depth to the seasonal high <br />water- table; [he kind of water table, that is, "Apparent", "Artesian", ar "Perched"; and the months of the year that <br />the eater table commonly is high. A water table that is seasonally high for less than I month is not iMicated in <br />this report. <br />An "Apparent" water table is a thick zone of free water in the soil. It is indicated by the level at which water <br />stands in an encased borehole after adequate time is allowed for adjustment in the surrounding soil. <br />An "Artesian" water table exists under a hydrostatic beneath en impermeable layer. When the impermeable layer has been <br />penetrated by a cased borehole, the water rises. The final level of the water in the cased borehole is characterized es <br />an artesian eater table. <br />A "Perched" water table is water standing above an unsaturated zone. In places an upper, or "Perched", water <br />table is sepe rated from a lower one by a dry zone. Only saturated zones within a depth of about b feet are <br />irx'" tad. <br />Ponding is standing water in a closed depression. The water is removed only by deep percolation, transpiration, <br />evaporation, or a combination of these processes. <br />This report gives the depth and duration of ponding and the time of year when ponding is most likely. Depth, duration, <br />and probable dates of occurrence are estimated. <br />Depth is expressed as the depth of ponded water in feet above the soil surface, Duration is expressed as "Very <br />brief" if less than 2 days, "Brief" if 2 to 7 days, "Long" if 7 to 30 days, and "Very long" if more than 30 days. The <br />information is based on the relation of each soil on the landscape to historic ponding and on local information about <br />the extent and levels of ponding. <br />