If B and d are the bed width and depth of a channel in metres, the combined losses due to evaporation and seepage in cumecs per kilometre length of the channel, is

• A. <img src="/_files/images/civil-engineering/irrigation/15-15-31-1.png">
• B. <img src="/_files/images/civil-engineering/irrigation/15-15-31-2.png">
• C. <img src="/_files/images/civil-engineering/irrigation/15-15-31-3.png">
• D. <img src="/_files/images/civil-engineering/irrigation/15-15-31-4.png">