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三江平原发展水田，主要依靠地下水．根据该地区水文地质情况，一般都打较大井生产，井深20～50m，井径150～400mm左右，安装6～8寸水泵，可控制面积100～300亩左右．
The development of paddy fields in Sanjiang Plain mainly depends on groundwater. According to the hydrogeological conditions in the area, generally larger wells are drilled with a well depth of 20-50m and a bore diameter of 150-400mm. A 6-8-inch water pump can be installed and the controllable area is about 100-300 mu.