Iran-based BMDesign Studios has unveiled Concave Roof, a double-roof system with steep slopes resembling a bowl for the purpose of rainwater collection in arid climates like Iran, where a lack of water could lead to mass displacement in the future.

Courtesy of BMDesign Studios

Iran-based BMDesign Studios has unveiled Concave Roof, a double-roof system with steep slopes resembling a bowl for the purpose of rainwater collection in arid climates like Iran, where a lack of water could lead to mass displacement in the future.Because precipitation in this area is less than one-third of that of the world average, and evaporation is more than three times higher than the world average, the concave roof system is designed to ?help [make] even the smallest quantities of rain [flow down] the roof and eventually coalesce into bigger drops, just right for harvesting before they evaporate? explained the architects. 
Courtesy of BMDesign Studios

Courtesy of BMDesign Studios

The outer shell of the roof system not only collects rainwater but also provides additional shading and allows air to move freely between it and the inner shell, acting as a cooling mechanism for both roofs.

Courtesy of BMDesign Studios

At a school with 923 square meters of concave roof area, it is expected that 28 cubic meters of water could be collected, with an efficiency of about 60 perc...