Several variations of border irrigation have been devised.

畦灌的几种变通方式已经被设想出来了.

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Border irrigation can be described as elongated basins with a gentle slope in the long direction.

畦灌可以描绘成长条形的格田,沿其长边方向具有较缓的坡度.

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Extensive land leveling is often required because the topography must be smoother than for furrow irrigation.

由于畦灌的地形必须比沟灌的平坦,因此,常常需要大面积平整土地.

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