For loss of head in a canal inverted syphon barrel, the factor in the Unwin formula is a coefficient for loss of head due to

For loss of head in a canal inverted syphon barrel, the factor in the

1.	For loss of head in a canal inverted syphon barrel, the factor in the Unwin formula is a coefficient for loss of head due to
A.	friction
B.	exit
C.	entry
D.	gradient
Answer» D. gradient