time of concentration (min) Length (km) of flow path from catchment divide to outlet Chezy’s coefficient at the site = R1/6/n hydraulic radius = 0.75RSwhere stream slope is fairly uniform 0.65RSwhere stream slope varies appreciably along the stream hydraulic radius at the initiallyassumed flood level at the site average Manning roughness coefficient for the entire stream length catchment area (ha) equal area slope of stream flow path (%) as defined in Figure 4.12.
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