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许昌市郊多年来平均降雨量为75毫米,其中70％集中于七、八、九三个月份;年蒸发量为1200毫米,远大于年降雨量。该地区土壤多属粉质壤土,浅层地下水埋深8～9米。虽然已建有井渠配套工程,但渠道水源供水不足,单井出水量又较小,远不能满足市郊灌溉用水要求,严重影响农业正常生产。为了在这种缺水地区探索增产省水的新途径,市水利管理站在省水科所和地区水科所的协助下,从1974年起开展了渗灌试验研
In the suburbs of Xuchang, the average rainfall over the years is 75 mm, of which 70% is concentrated in seven, eight and nine three months; and the annual evaporation is 1200 mm, much larger than the annual rainfall. The soil is mostly silty loam in the area, shallow groundwater depth of 8 to 9 meters. Although a well and channel supporting project has been built, the lack of water supply in the channel water source and the small single-well water discharge can not meet the requirements of suburb irrigation water and seriously affect the normal agricultural production. In order to explore new ways to increase water saving in such water-scarce areas, the Municipal Water Management Station, with the help of the Provincial Water Science Institute and the Regional Water Science Institute, conducted a pilot seepage experiment