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V DEPARTMHNT OF AGAICVLTURB <br />REOOURCHH CONSHRVATION EERVICE <br />., <br />WATER FEATURES <br />~ote -- WATER FEATURES--Continued <br />• PAGE l OP 3 <br />08/1'1/98 <br />~rmation on the extent of Flooding based on soil data Se lees epecif is Chan that provided by detailed engineering <br />eye that delineate flood-prone areas at epecif is flood frequency levels. <br />High water table (eeaeonall ie the highest level of a saturated zone in the soil in moat years. The depth to a <br />~eonal high water Cable applies to undrained soils. The estimates are based mainly on the evidence of a saturated <br />e, namely grayish colo re or mottles in the soil. Indicated in this report are the depth to the seasonal high <br />water [able; the kind of water table, that ie, •Appare nt•, •Artee ian•, or 'Perched'; and the months of the year that <br />the water table commonly ie high. A water table that ie seasonally high for less Chan 1 month is not indicated Sn <br />~e report. <br />An 'Apparent' water table ie a thick zone of free water in the soil. It Se indicated by Che level at which water <br />nda in an uncae ed borehole aE[er adequate time ie allowed for adjuetme n[ in the surrounding soil. <br />~•Arteeian• water [able exists under a hydros tat is beneath an impermeable layer. When [he impermeable layer hoe been <br />penetrated by a cased borehole, [he water rises. The final level of the water in the cased borehole Se characterized ae <br />~arteslan water table. <br />A Pe rahed• water table ie water standing above an unsaturated zone. In places an upper, or "Pe rchetl•, water <br />cable ie separated from a lower one by a dry zone. only saturated zones within a depth of about 6 feet are <br />rcated. <br />ponding is standing water Sn a closed depression. The water ie removed only by tleep percolation, tranepi ration, <br />~poration, or a combination of these processes. <br />e report gives the depth and duration of pontling and the time of year when ponding ie moat likely. Depth, duration, <br />and probable dates of occurrence are estimated. <br />I~Ch is expressed ae the depth of ponded water in feet above the soil surface. Dura Cion ie expre need ae "Very <br />NSa1 ef• if leas than 2 days, 'Brief' if ] to '1 days, 'Long' if ] to 30 Jaye, and 'very long' if more than JO days. The <br />information ie based on Che relation o£ each soil on the landscape to historic ponding and on local information about <br />extent and levels of ponding. <br /> <br /> <br />1 <br />1 <br />1 <br /> <br /> <br />