There are several reasons why your overflow pipe may be dripping outside, including a faulty ball valve, a blocked or damaged pipe, or high water pressure. To fix the issue, you may need to replace the valve, clear the blockage, or adjust the pressure regulator. It's best to consult a plumber if you're not sure what's causing the problem.
The purpose of an overflow pipe is to prevent flooding or damage caused by excess water in a system. It allows water to escape from a container or system when it reaches a certain level, preventing overflow and potential damage. This is commonly seen in plumbing systems, water tanks, and even in aquariums.
It depends on the severity of the leak and the potential damage it could cause. If the leak is minor and can be easily fixed, it may not be considered an emergency. However, if the leak is significant and could cause water damage or flooding, it should be addressed immediately. It's always better to err on the side of caution and call a professional plumber to assess the situation.