That would depend on the fixture load and the pitch of the line and the local codes as far as connecting to the public sewer /storm system
The recommended diameter for a 2-inch drain pipe in a residential plumbing system is typically 2 inches.
The recommended diameter for a 4 inch drain pipe in a residential plumbing system is typically 4 inches.
The standard shower drain pipe size for residential bathrooms is typically 2 inches in diameter.
The standard shower drain pipe size for most residential bathrooms is 2 inches in diameter.
The standard washer drain pipe size for residential washing machines is typically 2 inches in diameter.
The recommended drain pipe size for a residential kitchen sink installation is typically 1.5 to 2 inches in diameter.
The standard kitchen drain pipe size for residential plumbing systems is typically 1 1/2 inches in diameter.
The recommended diameter for a 4-inch vent pipe in a residential plumbing system is typically 2 inches.
A standard sink drain pipe is typically 1 1/2 inches in diameter.
The standard washer drain size for residential washing machines is 2 inches in diameter.
The standard shower drain size for most residential bathrooms is 2 inches in diameter.
The size of a standard sink drain pipe is typically 1 1/2 inches in diameter.