New product announcements: 04/22/2009 Capture Every Detail: Robotic Total Station The TS30 Robotic Total Station is the latest update to Leica’s line of surveying devices, and boasts ½-in. angle accuracy and 0.6-mm distance accuracy using prisms. It can achieve a distance accuracy of 2 mm at 1 km using only natural surfaces. The station can be fitted with a global-positioning antenna for logging exact coordinates during surveying. Its new Piezo technology allows uninterrupted surveying in changing environments with only one operator. A low-power mode during non use provides longer service intervals. Leica Geosystems; 770-326-9500; www.leica-geosystems.us Faster Pipe Connections: No Loose Parts
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.