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Intermittent stream <br />A stream, or reach of a stream, that does not flow year-round but that is <br />commonly dry for 3 or more months out of 12 and whose channel is generally <br />below the local water table. It flows only during wet periods or when it receives <br />ground-water discharge or long, continued contributions from melting snow or <br />other surface and shallow subsurface sources. <br />Invaders <br />On range, plants that encroach into an area and grow after the climax <br />vegetation has been reduced by grazing. Generally, plants invade following <br />disturbance of the surface. <br />Iron depletions <br />See Redoximorphic features. <br />Irrigation <br />Application of water to soils to assist in production of crops. Methods of <br />irrigation are: <br />Basin: Water is applied rapidly to nearly level plains surrounded by levees or <br />dikes. <br />Border: Water is applied at the upper end of a strip in which the lateral flow of <br />water is controlled by small earth ridges called border dikes, or borders. <br />Controlled flooding: Water is released at intervals from closely spaced field <br />ditches and distributed uniformly over the field. <br />Corrugation: Water is applied to small, closely spaced furrows or ditches in <br />fields of close-growing crops or in orchards so that it flows in only one direction. <br />Drip (or trickle): Water is applied slowly and under low pressure to the surface <br />of the soil or into the soil through such applicators as emitters, porous tubing, or <br />perforated pipe. <br />Furrow: Water is applied in small ditches made by cultivation implements. <br />Furrows are used for tree and row crops. <br />Sprinkler: Water is sprayed over the soil surface through pipes or nozzles from <br />a pressure system. <br />Subirrigation: Water is applied in open ditches or tile lines until the water table is <br />raised enough to wet the soil. <br />Wild flooding: Water, released at high points, is allowed to flow onto an area <br />without controlled distribution. <br />Kame <br />A low mound, knob, hummock, or short irregular ridge composed of stratified <br />sand and gravel deposited by a subglacial stream as a fan or delta at the <br />margin of a melting glacier; by a supraglacial stream in a low place or hole on <br />the surface of the glacier; or as a ponded deposit on the surface or at the <br />margin of stagnant ice. <br />Custom Soil Resource Report <br />45 Index #10