Graphic Relation of Intake, Length-of-Run and Time

by I-pai Wu, (A.M.ASCE), Asst. Agric. Engr. and Asst. Prof.; Agric. Engrg. Dept., Univ. of Hawaii, Honolulu, HI,
A. Alvin Bishop, (F.ASCE), Prof. and Head; Dept. of Agric. and Irrig. Engrg., Utah State Univ., Logan, UT,

Serial Information: Journal of the Irrigation and Drainage Division, 1970, Vol. 96, Issue 3, Pg. 233-240

Document Type: Journal Paper


The total amount of infiltration of surface irrigation expressed as a function of length of run and time is controlled by the advance function of stream inside the furrow (or border) and the infiltration intensity function can be expressed as a power function. There is a linear relationship between the time of advance and the opportunity time of infiltration with the total irrigation time as parameters. A simple graphic solution can be developed and used for estimating infiltration along the furrow (or border) at any given time during irrigation including the recession time. The technique is simple and requires no mathematical computation and can be used as a preliminary estimation of infiltration pattern or evaluation of an irrigation system. The shape of the infiltration pattern along the run can be used to determine the distribution efficiency and the application efficiency of surface irrigation.

Subject Headings: Infiltration | Surface irrigation | Irrigation systems | Two-dimensional flow | Linear functions | Parameters (statistics) | Graphic methods | Computing in civil engineering

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