New product announcements: 03/25/2009 Medium-Duty Truck: Crew Option Available in the fall, Dodge offers its second-generation, restyled chassis cabs for the first time with a crew-cab option. The 3500 comes with a new 5.7L HEMI V-8 engine, while the 4500/5500 comes standard with a 6.7L Cummins turbodiesel packing 610 lb-ft of torque and equipped with all-new selective-catalytic reduction for 50-state emission compliance. An 8-gallon urea tank will need to be refilled for about every 400 gallons of fuel used, at least once for every 7,500-mile oil-change interval, Dodge says. Inside, a new, optional center console stores and powers a laptop computer.
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.