Is it legal for someone else to drip water from the balcony in front of my house and make a 1 meter

Unreasonable, because it affects your light.

But there are two issues that affect your rights:

First, whether this is your foundation house or commercial housing, different houses say differently.

Second: Is the ownership of the drip edge yours or a public place or land. If the drip is outside someone else's violation, in principle, you have no right to open the window because your lighting is someone else's area.

If the other party has agreed to open the window and then affect the lighting, it is the other party's violation. This is the statement of the foundation dwelling. If you are a commercial house, you can find a property to deal with, and the commercial building cannot change the structure of the house or do the behavior of influencing other residents.

When you didn't build a wall before, why didn't you refuse, now that you have done it, you can discuss with him and demolish the wall, but it really can't be done, you can forcibly demolish it, and you can make your own decisions.

You should take a picture of this problem!!

Fences also belong to buildings. If it is built without approval, it is an illegal construction. You can report it to the construction committee, urban management, property, community, street and other management departments.

If the walls are very low and do not affect third parties, then things can be calmed.

But the other party in your question is obviously not like this, then it must be solved by law.

Others made a one-meter-high fence on the balcony in front of your house for the first water. It is not legal, first of all, find him and warn him.