The Internal Revenue Service has given design and construction firms a one-year reprieve from a contract-payment withholding requirement that industry contends would deal them a financial blow. The mandate stems from a provision of a 2006 statute that requires federal, state and local governments to withhold an amount equal to 3% of their payments to anyone providing them with goods or services. The mandate applies to agencies whose total annual spending on goods and services is $100 million or more. Individual payments of less than $10,000 would be exempt from the withholding requirement. The mandate originally was to take effect
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.