Image: Louisiana Universities Marine Consortium Scientists in Louisiana say the "dead zone" in the Gulf of Mexico is three times the target set by a federal-state task force in 2001. Related Links: Ohio statewide harmful algae bloom response strategy Information on NRDC lawsuit The recent drinking-water crisis brought on by algae blooms has put Toledo's water-quality troubles on the national stage. The issue is common: Runoff from urban and agricultural areas and wastewater treatment plants create hypoxia, or algae blooms, that choke oxygen for fish and other aquatic life and trap toxins, which can poison the water."Currently, we are seeing
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.