DU fife L n So Ic Fa U5135

where qin is the unit inflow rate (per furrow or per unit width of the border or basin); L is the length of the furrow, border, or basin; n is the roughness coefficient; SO is the longitudinal slope of the field; Ic represents the intake characteristics of the soil; Fa represents of the cross-sectional characteristics of the furrow, border, or basin; and tco is the time of cutoff.

The water application efficiency can be described by the same factors above together with the SWD when irrigation starts:

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