Differs soil to soil. Figure 1 illustrates these different infiltration regimes. Infiltration capacity curve: A graph showing the time-variation of infiltration capacity if the supply were continually in excess of infiltration capacity. 7.6a; Fig.7.6b shows an infiltration capacity curve for normal antecedent conditions on turf. Infiltration. The dashed curve represents the infiltration capacity q cap (t) of a sandy loam soil profile. Assumes spatial homogeneity of rate . Typical infiltration rates at the end of 1 hr () are shown in Table 7.1.A typical relation between and the infiltration rate throughout a rainfall period is shown graphically in Fig. Therefore, the actual infiltration rate equals the infiltration capacity, and the decay of infiltration capacity follows Horton’s equation with an initial infiltration capacity equal to f op and starting at time t * = 20 min (Table 3 - Column 5 and Table 4 Column 3). Horton model: Horton (1938) observed that the time reduction in infiltration capacity is directly proportional to infiltration rate and hence, proposed the following equation (2) f = f c + (f 0 − f c) e − k t where f = infiltration capacity at time t from the start. Infiltration is high at the beginning of a storm when the soil is dry. infiltration capacity . The infiltration capacity curve for a watershed is given by f p = (296 – 21)e–0.07t +21, where t is in min and f p in mm/hr. Infiltration rate. For an initially dry soil subjected to rain, the infiltration capacity curve shows an exponentially decaying trend as shown in Figure. The rate at which infiltration takes place expressed in depth per unit time. It decreases as the soil becomes saturated and ultimately approached a limiting constant value (fc). When infiltration is below its capacity, the infiltration function will also depend upon the temporal history of the application rate. fo – initial infiltration capacity fc – limiting constant value of infiltration 12. also different for the same soil in its moist and dry states . infiltration capacity f op = 6.15 cm/h. If the slope of a line for infiltration capacity curve is 1 to 1.737 , the value of constant k in Horton's equation of infiltration capacity curve, is A.2 B.2.5 C.3 Infiltration Capacity Curve Infiltration occurs only after the interception and depression storage losses have been satisfied. The storm pattern is: Prepare the (a) standard infiltration curve, (b) cumulated infiltration curve, and (c) revised infiltration curve for the storm pattern above. Converted to volume (ft3/s, m3/d) by multiplying rate times area .

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