In this study, selected types of grasses were studied to determine their hydraulic roughness coefficient and select the most suitable grass for erosion control. The experiments performed in twelve trapezoidal open channels measuring 5 m x 0.12 0.03 at different flow depths (0.001m, 0.002m, 0.003m, 0.004m 0.005m) varying bed slope (0.2%, 0.3%, 0.4%). Overall, Bahama showed highest Manning’s n-va...