Ogee spillway with a designed water depth of hd= 3 m. Downstream of spillway is a straight floodway (channel) made of compact aggregates with D50=12 mm and slope of So=0.0003 [25/100]. Note: Assume an energy loss equal to 15% of the velocity head at the downstream. Use Swammy and Mittal’s formula to estimate critical shear stress. Use two iterations if needed.
Water flows over a 3 m wide and 10 m high Ogee spillway with a designed water depth of hd= 3 m. Downstream of spillway is a straight floodway (channel) made of compact aggregates with D50=12 mm and slope of So=0.0003 [25/100]. Note: Assume an energy loss equal to 15% of the velocity head at the downstream. Use Swammy and Mittal’s formula to estimate critical shear stress. Use two iterations if needed.
a) Calculate the flow rate.
b) Write energy equation and find y1 and Fr1.
c) Calculate the tailwater level of the floodway using tractive force method.
d) Determine whether the hydraulic jump at the downstream submerges of washes away.
e) Design the necessary hydraulic structure (Increasing the slope of apron for submerged
condition or step rise if the jump washes away
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