Can't be zero: You have for example, a 1 ft by 1 ft column in flowing water, perhaps 12 feet deep.
That's got to be calculable for water resistance on a resistance per foot length basis.
There's also material, thickness and shape to consider. Is it a perfect square, how thick is it and what's the material? Density plays a role in drag/resistance.
yea zero doesnt make sense. I must have remembered the formula wrong, or maybe the wrong formula! Would it be drag coefficient?