I plan to introduce water and water to the balcony when I wash clothes and decorate. Is this good from the perspective of geomantic omen?

Now, most of the layout of the house has been laid on the balcony, which is used to put the washing machine.

There is nothing wrong with feng shui. The point is, if your balcony didn't have a sewer, it's troublesome to change it to a sewer now, and it may not be feasible. As for the water inflow, there is no problem.