Given: An engineer designs a building storm drainage system in Type-M copper tubing. The building height is 6 stories. The rainfall in the area is based on 4 inches per hour. He calculates that he will need two 4 inch roof drains and one 3 inch roof drained would be most nearly ____ square feet.

Given: An engineer designs a building storm drainage system in Type-M copper tubing. The building height is 6 stories. The rainfall in the area is based on 4 inches per hour. He calculates that he will need two 4 inch roof drains and one 3 inch roof drained would be most nearly ____ square feet.