Hum...
so if cross section is irrelevant, the water would be raised/lowered by 30 mm, no matter what the diameter...
...but if the diameter is say, 1 meter, the volume of water moved would be 0.024 cubic meters, which is 24 liters, which weighs 24 kg.
If the diameter was 2 cm, then the volume of water would be 0.0000094248 cubic meters, which is 0.009425 liters, which weighs 0.009425 kg, aka 9.4 grams.
Given that the fan will produce a fixed amount of force, the diameter very much makes a difference.
Am I wrong?
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