132 BENDS, TRANSITIONS, AND OBSTRUCTIONS 



grade of 1.5 per cent. The maximum discharge will be about 300 c.f.s. Design the 

 curve. How high should the walls be built? 



1002. A bridge which has three sets of twin cylindrical piers 6 feet in diameter 

 crosses a stream which is normally 300 feet wide and 15 feet deep when the discharge 

 is 30,000 c.f.s. What will be the height of the backwater caused by the bridge at this 

 discharge? 



