Proceedings of the 2007 World Environmental and Water Resources Congress, held in Tampa, Florida, May 15-19, 2007. Sponsored by the Environmental and Water Resources Institute of ASCE. This collection contains 638 papers that approach the environment from the perspective of natural resources, examining how to mitigate human impact upon natural resources. Topics include: aquifer and lake recovery and restoration; climate change, variability, and drought; computational hydraulics; ecohydraulics; endocrine disruptor chemicals in the environment; environmental engineering and public health; environmental impacts of emerging contaminants; groundwater hydrology, quality, and management; history and heritage; international issues; irrigation and drainage; landscape architecture; local Florida issues; NEXRAD application and data analysis; probabilistic approaches in watersheds; river restoration; scour and erosion; sedimentation; stochastic hydrology and frequency analysis in water resources; sustainable water pollution engineering; urban stream restoration; water desalination and concentrate management; water resources planning and management; watershed management and restoration; wetland restoration. The collection also contains papers from special sessions: 4th Urban Watershed Management Symposium and Water Distribution System Analysis 2007.