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随着对耕地垦拓的需求日益扩大,秦汉时期在继续开发条件良好的平原和河谷地带的同时,也加大了对低洼、沼泽、干旱地带等相对劣等土地的利用.当时兴建的很多农田水利工程都以营造田地为主要目的,在扩大土地利用,改善土壤性状方面起了无可替代的关键作用.北方地区的灌溉渠系对于盐碱地的淤灌改良,江淮以南的陂塘工程对于低洼沼泽的改造利用,西北边区的明渠井渠对于干旱地区的农田开发都具有非常重要的意义.
As the demand for cultivated land reclamation increased day by day, the use of relatively inferior lands such as low-lying, swampy, drylands and other lands was intensified while Qin and Han Dynasties continued to develop plains and valleys with good conditions. The main purpose of the project is to create the land, which play an indispensable key role in expanding the land utilization and improving the soil properties. The irrigation canal in the north is good for the siltation improvement in saline-alkali land and the transformation to the low-lying swamp in Huangtang project south of Jianghuai Utilization of open channel and canal in the northwest border area is of great significance for the development of farmland in arid areas.