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U.s. DEPARTMENT OF AGRICULTURE FADE 3 DF 3 <br />NATURAL kESUURLES CUNSERVATIUN SERVICE • • 04/i11v8 <br />NATER FEATURES <br />Endnote -- NATEk FEATURES--Continued <br />Information on the extent of flooding based on soil sate is less specific than that provided by detailed engineering <br />surveys that delineate flood-Drone areas et specific flood frequency levels. <br />Nigh eater table (seasonal) is the highest level of a saturates zone in the soil in most years. the depth to a <br />seasonal high eater table applies to undrained 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 />eater table; the kind of eater table, that is, 'Apparent', 'Artesian , or 'Perched'; end the months of the rear that <br />the eater table commonly is high. A eater table that is seasonally high for less than 1 month is not indicated in <br />th15 report. <br />An 'Apparent' voter table is a thick zone of free eater in the soil. It is indicated by the level at which eater <br />stands in an encased borehole after adequate time is allowed for adjustment in the surrounding soil. <br />An 'Artesian' rater table exists under a hydrostatic beneath an impermeable layer. Uhen the impermeable layer has been <br />penetrated by a cased borehole, the water rises. the final level of the rater in the cased borehole is characterized as <br />an artesian aster table. <br />A 'Perched' eater table is eater standing above en unsaturated zone. In places an upper, or 'Perched', eater <br />table is separated from a loner one br s dry zone, Gnly saturated zones within a depth of about o feet are <br />indicated. <br />Ponding is standing water in a closed depression. The eater is removed only by deep percolation, transpiration, <br />evaporation, or a combination of these processes. <br />This report gives the depth and duration of pondin9 and the time of near Uhen Ponding is mast likely. OeDth, duration, <br />and probable dates of occurrence ere estimated. <br />Depth is expressed as the depth of ponded eater in feet above the soil surface. Duration is expressed as 'Very <br />brief' if less then i days, 'Brief' if 2 to 7 days, 'Lone' if 1 to 3G days, end 'Very long' if more than 30 days. The <br />information is based on the relation of each soli on the landscape to historic pondin9 and on local information about <br />the extent and levels of Ponding. <br />