Is there a saying in Feng Shui that water gathers wealth?

Yes "Buried Sutra" mentioned: "Qi is scattered by the wind, and the boundary water comes. The ancients kept it together and stopped it. " So it's called feng shui.

In modern furniture geomantic omen, roads and water are used as wealth, but if you want to gather wealth, you need geomantic mascots with different functions. Elephants, for example, have the function of making money.