New product announcements: 09/30/2009 Utility Vehicle Storage covers: Lockable Tonneau covers previously intended for pickup trucks are now available in models designed for Kubota RTVs and John Deere Gators. The lockable bed covers are capable of supporting up to 250 lb of tie-down weight. Other Diamondback UTV accessories include roofs, floor mats, bumpers, arm guards and rear-bed racks. All the accessories are available in both uncoated polished aluminum and black with protective coatings. Diamondback Truck Covers; 800-935-4002; www.diamondbackutv.com Residential Backup Generator: Lightweight The RS20000 from Cummins Onan is a backup generator for residential use. It features engine and alternator heaters for
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.