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(Solved): = 0.035 river) 4. The cross section of a river is shown below. The main river channel is lined with ...
= 0.035 river) 4. The cross section of a river is shown below. The main river channel is lined with slope of with short grass and has a Manning's n of 0.035. The over bank area is lined the river is 0.2%. a) Compute the water depth, h, if the dry weather flow is 1.0 m³/s is the water depth contained in the main channel? b) Compute the water depth for a flood flow of 30 m³/s. c) Show that the best hydraulic section (minimum wetted perimeter for a given cross sectional area) for a rectangular channel occurs when the water depth y is one half the channel width (B). 1? 1 1 K Over Bank Area 0.5 m B? = 100 m Not To Scale Main River Channel B? = 10 m THP rec h? Va h? I trig h?
4. The cross section of a river is shown below. The main river channel is with short grass and has a Manning's \\( n \\) of 0.035 . The over bank area is lined with dense brush and has a Manning's \\( n \\) of 0.150 . The tongitudinal slope of the river is \. a) Compute the water depth. \\( h_{1} \\) if the dry weathor flow \\( 151.0 \\mathrm{~m}^{3} / \\mathrm{s} \\) is the watert depth contained in the main channel? b) Compute the water depth for a flood flow of \\( 30 \\mathrm{~m}^{3} / \\mathrm{s} \\). c) Show that the best hydraulic section (minimum wetted perimeter for a given cross sectional area) for a rectangular channel occurs when the water depth y is one half the channel width (B).