淡水河,流經中華人民共和國廣東省深圳市和惠州市,是西枝江左岸支流,上游也稱龍崗河,發源於深圳市梧桐山北麓,[1]支流有坪山河、橫嶺水[2]向北流經深圳市龍崗區和惠州市惠陽區,最後於惠州市惠城區三棟鎮紫溪匯入西枝江。河長95千米,河床比降0.57‰,流域面積1308平方千米。年徑流量12.23億立方米。1991年後,受上游影響,淡水河水質極差,平、枯水期水質為V類或劣V類。[3]
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