Other chickens walk around the bale browsing around the edges of the bale, and eating the alfalfa flakes that get scratched off onto the ground by the upper chickens. Alfalfa is a very nutritious food crop. Alfalfa sends it's roots deep into the soil.
Soil or Waste Stacks. A soil or waste stack (normally just called a stack) is a drainage pipe that passes through at least one story(floor to ceiling) as a drain pipe, this also includes any horizontal offsets. Every soil or waste stack will terminate in a stack vent that leads to outside air or a vent header.
Behind the wall (where you canât see), a vent line and drainpipe lead to a soil stack, which is the control center of the wastewater system. Drain pipes take the wastewater to the soil stack; through the stack, sewer gases are carried up to the roof through vent lines. All the faucets and water appliances in a house use this same system of drains, pipes, and vents.