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龙州县位于广西西南部,西面与越南民主共和国接壤。水口河、平面河(黎溪)由越南分别入境后,在县城汇合而成左江。龙州水文站是左江上游控制站,流域面积约一万八千九百平方公里,大部分在国外,国内仅占三分之一。该站地处亚热带,气候炎热,夏季长,光照强,蒸发量大,雨量充沛,年平均降雨量在1450毫米以上。较大和特大的洪水多由台风雨造成。洪水陡涨陡落,漂浮物多,具有山溪河流特性。据实测资料,一次洪水最大涨幅高达19.63米,最大水深27.0米,最大流速3.46米,最大流量12000米~3/秒,最大水位涨率每小时1.30米,洪峰持续时间一般为一小时。因此,水文测验工作有一定的困难。
Longzhou County is located in southwestern Guangxi Province, west of the border with the Democratic Republic of Vietnam. Shuikou River, Plane River (Li River) by the Vietnamese immigrants, respectively, in the county merged into the left. Longzhou Hydrological Station is the upper reaches of the left river control station, drainage area of about 18,900 square kilometers, most of them in foreign countries, only one-third of the country. The station is located in the subtropical, hot climate, summer long, strong light, evaporation, rainfall, annual average rainfall above 1450 mm. Larger and larger floods are mostly caused by typhoons. Flood steep rise and fall, floating objects and more, with the characteristics of mountain streams and rivers. According to the measured data, the maximum flood rise of up to 19.63 meters, the maximum depth of 27.0 meters, the maximum flow rate of 3.46 meters, the maximum flow of 12,000 m ~ 3 / s, the maximum water level rise rate of 1.30 meters per hour, peak duration is generally one hour. Therefore, hydrological tests have some difficulties.