Groyne is building cross river that serves as building steering flow to protect riverbanks from attacks the current flows. Laboratory model used to demonstrate the phenomenon of pattern flows that occur around the Groyne at the maender. Groyne models used in this study is Groyne type impermeable with dimensions of length 0.15 m, width 0.03 m and high 0.15 m. The flow rate used is 0.00134 m3 / s…