Determination of Hydraulic Roughness Coefficients of Some Vegetated Species in Awka, Nigeria

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-value due its deep root system creeping nature. For each slope, degree submergence, Reynolds number, depth increases as n decreases. As increases, number increased while drag coefficient, Cd