164 



HYDRAULICS AND ITS APPLICATIONS 



; log 4^ = '0301 ; .-. K'= 3-46 x 



Example : s = 2 : 1 ; H = 4-0 ; .-. K 1 = 3'46 x 

 1-0716 = 3-70. 



This formula holds for weirs with an up-stream slope more than from 

 3 feet to 4 '5 feet broad, and with a down-stream radius (above from 2 feet 



35 83' 



Q'4 5-0'-4-5-0'^ 13-1' 

 6 : 75' 5-92' 1--4-6' 



FIG. 89c. 



to 3 feet) great enough to retain the nappe in contact, and yet not so 

 large as to simulate a broad, flat crest. 



TRAPEZOIDAL AND TRIANGULAR WEIRS (G TO L). FIG. 89B. 



Type G. 



" Kafter," crest height = 4'7 feet. 



