Bentonville, Ark. -- Wal-Mart Stores said Friday that its new store in Portland, Ore., will feature the state’s largest green roof.
According to a report by Oregon’s Daily Journal of Commerce, the 90,000-sq.-ft. store, which broke ground Friday in North Portland, will be topped by a 40,600-sq.-ft. green roof, surpassing by more than 10,000 sq. ft. the current largest green roof over the Ramona apartment complex in Portland.
The report said that the Bureau of Environmental Services will use the roof to conduct a three-year water run-off performance study.
Each of the green roof’s three sections will have different soil levels to allow the city to determine which level is most effective in reducing stormwater runoff. One of the sections will feature a rougher soil type, which wil