The existing yard was 30'x40'. To add to the length of the yard, we took the kennel panels we used to use to keep the goats in at night (when they were little) over to the chicken yard. In the photo above, we were in the process of adding the panels to the end of the existing chicken yard. After we had two additional panels added to each side of the yard, we moved the three end panels out to the 'new' end of the yard. Alan set a t-post at each joining section of fence, to keep things nice and stable.
By adding four more panels we were able to make the yard 30'x60'! I will need to fasten some wires across the yard at various locations to deter predatory birds from dropping into the yard. At night, all the chickens and ducks get locked up in the covered yard/coop area, safe from night time predators.