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Impervious soil <br />A soil through which water, air, or roots penetrate slowly or not at all. No soil is <br />absolutely impervious to air and water all the time. <br />Increasers <br />Species in the climax vegetation that increase in amount as the more desirable <br />plants are reduced by close grazing. Increasers commonly are the shorter <br />plants and the less palatable to livestock. <br />Infiltration <br />The downward entry of water into the immediate surface of soil or other <br />material, as contrasted with percolation, which is movement of water through <br />soil layers or material. <br />Infiltration capacity <br />The maximum rate at which water can infiltrate into a soil under a given set of <br />conditions. <br />Infiltration rate <br />The rate at which water penetrates the surface of the soil at any given instant, <br />usually expressed in inches per hour. The rate can be limited by the infiltration <br />capacity of the soil or the rate at which water is applied at the surface. <br />Intake rate <br />The average rate of water entering the soil under irrigation. Most soils have a <br />fast initial rate; the rate decreases with application time. Therefore, intake rate <br />for design purposes is not a constant but is a variable depending on the net <br />irrigation application. The rate of water intake, in inches per hour, is expressed <br />as follows: <br />Very low: Less than 0.2 <br />Low: 0.2 to 0.4 <br />Moderately low: 0.4 to 0.75 <br />Moderate: 0.75 to 1.25 <br />Moderately high: 1.25 to 1.75 <br />High: 1.75 to 2.5 <br />Very high: More than 2.5 <br />Interfluve <br />A landform composed of the relatively undissected upland or ridge between two <br />adjacent valleys containing streams flowing in the same general direction. An <br />elevated area between two drainageways that sheds water to those <br />drainageways. <br />Interfluve (geomorphology) <br />A geomorphic component of hills consisting of the uppermost, comparatively <br />level or gently sloping area of a hill; shoulders of backwearing hillslopes can <br />narrow the upland or can merge, resulting in a strongly convex shape. <br />Custom Soil Resource Report <br />44 Index #10