MB4 208a: Drawing Water via Overlapping Porches over Water on Shabbos (355:5); Canals Running Through a Yard (356:1 - part 1)

Two apartments one above the other with porches that hang over a body of water with holes to draw water. Do they need to make an Eruv to draw water?

Using water from a canal of water that bisects a walled yard and enters/exits under the wall.