water rushing over rocks, a torrent, or a waterfall

山间飞泷如白练般垂下。

torrential, specifically describing the intensity or sound of heavy rain

大雨泷泷，彻夜未停。

Shuang river in Hunan and Guangdong (modern Wu river 武水 Wǔ​shuǐ)

泷水流经湖南与广东交界处。