BT Yom 77b(35) :שני ההוא נחלא דרדפי מייה‏ : that wadi is different since its water flows rapidly
See the entire entry for nḥel, naḥlā n.m. wadi

BT Yom 77b(35) :שני ההוא נחלא דרדפי מייה‏ : a wadi whose water flows rapidly is different
See the entire entry for rdp vb. to follow, pursue