One major problem is that degraded soils become compacted and so absorb less water, which then tends to run off the surface, taking topsoil with it.
一个主要的问题是，退化的土壤变得密实，造成吸水量减少，从而导致水从地表流失并将表土带走。
An expansive biological pond serves as a basin collecting rainwater and surface water run-off for landscape irrigation.
一个广阔的生物池塘作为收集雨水和地表水径流的景观灌溉流域。
Deep pipe irrigation can be especially useful on slopes and in crusty soils where surface applied water will run off.
深度管道灌溉在斜坡和硬质土壤环境中非常适用，因为在那些地方地表灌溉浪费水资源。
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