332 



HYDKAULICS AND ITS APPLICATIONS 



Section C is 220 feet long and includes two 50 feet radius reverse 



curves. 



D is 1075 feet long and is practically straight. 

 The horizontal curves were approximated to in construction by 10 foot 

 tangents. The mean depth throughout was approximately 4 feet and the 

 hydraulic mean radius 2' 14 feet. 



The low value of the coefficient C in D as compared with that in A is 

 doubtless due to the loss produced in this section during the redistribu- 

 tion of velocities produced by bend C and ought strictly to be debited to 

 that bend, while similarly, a certain portion of the loss really due to 

 bend B would appear due to the bends in the next section C. 



Probably the following values of C would be more approximately 

 correct. 



A. and D. Straight channel 



B. Curve of 100 ft. radius . 



C. Eeverse curves of 50 ft. radius 



Value of C. 



128 



118 



88 



ART. 95. DISTRIBUTION OF VELOCITY IN AN OPEN CHANNEL. 



Depression of the Filament of Maximum Velocity. 



As in the case of a closed pipe, the resistance introduced by the solid 

 boundaries causes the velocity to diminish in the neighbourhood of the 



