Estimation of Manning Roughness Coefficients on Precast Ecological Concrete Blocks

Investigating the Relationship between the Manning Coefficients (n) of a Perforated Subsurface Stormwater Drainage Pipe and the Hydraulic Parameters

“…The relationship between the obtained Manning's n for the perforated pipe under two slopes of 1:750 and 1:1000 under phases of GFO and GPO and the measured flow velocities in the perforated pipe in this work (Figure 7) agreed with Manning's equation (Equation ( 1)), where the Manning coefficient varied inversely with flow velocity [34]. This relationship followed a similar pattern to studies conducted by Kee et al [23], Mohammadpour et al [25], Barky [35], Trout [36], and Chang et al [37] using modular channels and Chen et al [38], Fathi-Moghadam and Drikvandi [39], and Conesa-García et al [40] using vegetated channels for the runoff infiltration purposes. The relationship between the obtained Manning's n for the perforated pipe and the measured Froude numbers (Fr) also followed a trend similar to studies conducted by Kee et al [23] and Mohammadpour et al [25] using modular channels and Chen et al [38] and Fathi-Moghadam and Drikvandi [39] using vegetated channels for the runoff infiltration purposes.…”

Impact of the Drainage Slope Experimental Study on the Manning Roughness Coefficient

“…In addition to on the angles between perpendicular plate and gradient plate it's formed a compressed plastic tubing with a diameter of one centimeter to a climactic and the same situations for water current on gradient and evade break the current of water was located. It is important that all the perimeter of the wedge is closed by paste aquarium to avoid the error discharge (current degree) (Chang et al, 2010). First trials connected to the flat panel is done in dissimilar current degree, then the steep panel dry and the favorite coarseness plane which superficial coarseness quantified by siftings for each coarseness size have been consistently sized and devoted to procedure compressed iron by glue on a plastic plate with a width of about three millimeter or less.…”

“…Dissimilar revisions and examines pointers by the way in addition to investigational modeling and scientific modeling and they are seeking associations amongst hydraulic possessions of the current in the hydraulic persistence in outside situations, mostly the current of the stream Models has been finished, then insufficient revisions have examined about surface river in zones with sharp gradient (Emmett, 1970). These revisions tried to suitable relationships by evaluation a quantity of flexibles for example the Re number, the Fr number, the roughness features, Area gradient and flora cover proportion gained in this zone (Chang et al, 2010). Most new revisions gained empirically associations with application to surface currents, network tubes and flat conduits.…”