Managing the Integrity of Metal Washington Park Pavillion Washington Park in Chicago was developed in 1869. Ever since it has become the most recreational area in the whole city. The flexibility provided by the metal structure offers a situation with abundant connection options for sound and lighting equipment. The aluminium tubing arcs offer support for an efficient covering used to help manage the environment. The maximum bearing capacity of the arch is used effectively in the support of the angled member extending from the ground. Roofs with greenery improve the hot, dry climate of the large city by laying a shading, cooling cover over the hot roofs. If the surface temperature of a traditional flat roof climbs to over 80*F in the summer, a green one does not increase to more than 40*F. Green roofs work like a sponge and store between 50-70% of the natural precipitation, which comes to the benefit of the local water cycle via evaporation (with the side effect of cooling from evaporation). Thanks to the water storage capacity, green roofs break the onslaught of water after heavy rainfall and thus make much smaller sewer networks possible.These kind of roofs will also provide the possibility of social environments and gatherings. Foldable Roof Structure Concept, 2002 Site Plan