单选题The controlling depth of the river is（）.Athe minimum depth of the river prescribed in the channel maintenance programBthe edge of a dredged channelCthe highest level to which the river may rise without floodingDthe least available water in a channel which limits the draft of boats and tows
单选题
The controlling depth of the river is（）.
A
the minimum depth of the river prescribed in the channel maintenance program
B
the edge of a dredged channel
C
the highest level to which the river may rise without flooding
D
the least available water in a channel which limits the draft of boats and tows
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