If you scaled the earth to the size of a large bowling ball, the average depth of the oceans would be 0.00248 inches or about 2.5 thousandths of an inch.
Also, on such a small amount (depth) of water, you have to take into account forces that do not scale such as evaporation and water surface tension and the size of atoms/molecules.
Evaporation would probably get rid of the water in a minute (oceans don't do that) and surface tension would probably be 1000's of times more important than gravity.
I have a great idea for anyone who wants a scale model - why don't you first demonstrate a scale model of a human at that size with functioning systems (e.g. circulatory, respiratory, reproductive, etc.). After all, size doesn't matter does it? If you can make a human 100 nm tall (scale model), I will believe humans exist.