Boarder irrigation.

 Border irrigation is a method of controlled surface flooding. The field to be irrigated is divided into strips by parallel dikes or border ridges, and each strip is irrigated separately. Water is introduced at one end and progressively covers the entire strip. Three different kinds of border irrigation--level, graded, and guide--are used depending on topography, soil, water supply, and other factors. Each kind has features that are advantageous under some circumstances and disadvantageous under others. In planning an irrigation system for a farm and selecting a method of applying water to the soil, the advantages and limitations of each of the three kinds of border irrigation must be considered carefully.

Border irrigation is suited to all crops that are not damaged by inundation for short periods. It can be used with almost any crop if site conditions are such that the needed degree of water control can be obtained. It can be used on nearly all irrigable soils but is best suited to soils whose intake rates are neither extremely low nor extremely high.

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