If Dc is the critical depth, D is the depth of water down stream and HL is the total head loss at the cistern of a vertical fall, the depth x of the cistern below the bed level down stream suggested by Blench, is

If Dc is the critical depth, D is the depth of water down stream and H

1.	If Dc is the critical depth, D is the depth of water down stream and HL is the total head loss at the cistern of a vertical fall, the depth x of the cistern below the bed level down stream suggested by Blench, is
A.	<img src="/_files/images/civil-engineering/irrigation/20-15-95-1.png">
B.	<img src="/_files/images/civil-engineering/irrigation/20-15-95-2.png">
C.	<img src="/_files/images/civil-engineering/irrigation/20-15-95-3.png">
D.	<img src="/_files/images/civil-engineering/irrigation/20-15-95-4.png">
Answer» C. <img src="/_files/images/civil-engineering/irrigation/20-15-95-3.png">