訓 なが(れる),なが(れ),なが(す),-なが(す) ・ 音 リュウ,ル
Sino-Vietnamese: lưu
Water 氵 gives the meaning; the right side shows a baby carried along with its hair streaming: water sweeping things away, so it means flow (Han Viet luu, as in luu thong = circulation).
Stroke data: KanjiVG (CC BY-SA 3.0) — kanjivg.tagaini.net
川の水がきれいに流れています。 (かわのみずがきれいにながれています)
The river water is flowing clear.