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北引渠首江道工程位于嫩江中下游们河市拉哈镇三江口，拉查（拉哈一查哈阳农场）公路上游7km的观测区域内，分东、西两支水流。为了系统探讨北引渠首引水江道演变规律，保证北引元坝引水工程的正常运行，设立了拉哈水文站（北引渠首水文站），任务就是积累逐年的水文资料，为江
The north lead channel project is located in the observation area of 7km upstream of the highway Racha (Racha-Chahayang Farm) in Laha Town, Middle and Lower Nenjiang River, Nenjiang River and divided into two streams of east and west. In order to systematically investigate the evolvement law of the diversion channel in the north channel and ensure the normal operation of the diversion project in the northern part, the Laha Hydrographic Station (North Diversion Canal Hydrology Station) was set up. The task is to accumulate yearly hydrological data,