A new process that measures the value of the social and environmental benefits of projects is generating buzz among academics, the private sector, public entities and government agencies. Developed by Omaha, Neb.-based engineering consultant HDR, the Sustainable Return on Investment (SROI) process allows decision-makers to evaluate a potential project’s overall sustainability benefits by assigning monetary values to environmental, social and economic impacts. Image Photo: Diagram Courtesy Of HDR The values on the vertical axis show the probability that the corresponding return on investment values, described on the horizontal axis, will not be exceeded by the actual ROI outcome. “Communities want
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.