对于三江平原的水利建设,曾有过“赛马场型”、“沟井池田”、“内水内销”、“井灌井排”和“排蓄灌”等不同模式。“赛马场型”水利系指把耕地区划成椭圆型,中央开挖椭圆型贮水池。把土填在耕地四周,并撒开摊平,形成四周外高内低,使耕地耕作单元如赛马场跑道似的。可见这种区 For the water conservancy construction in the Sanjiang Plain, there have been different modes such as “racetrack type”, “ditch well pond”, “inner water domestic sales”, “well and well row arrangement” and “row and fill irrigation”. “Racetrack type” means the farming area is divided into oval plow, the central excavation oval cistern. Fill the soil around the arable land and spread it flatly to form four outer highs and lows so that the cultivated arable units such as the racetrack runway. Visible to this area