1. American Water Works Association. {n. d.}. Buried no longer: confronting America's water infrastructure challenge. http://www.awwa.org/infrastructure. American Water Works Association. {n. d.}. Buried no longer: confronting America's water infrastructure challenge. http://www.awwa.org/infrastructure.
2. L. Begnudelli B. F. Sanders and S. F. Bradford. 2008. Adaptive Godunov-based model for flood simulation. Hydraulic Eng. (2008). L. Begnudelli B. F. Sanders and S. F. Bradford. 2008. Adaptive Godunov-based model for flood simulation. Hydraulic Eng. (2008).
3. T. Brinkhoff. 2005. City population. (2005). T. Brinkhoff. 2005. City population. (2005).
4. Environmental Protection Agency US. 2001. Potential contamination due to cross-connections and backflow and the associated health risks. Office of Ground Water and Drinking Water Washington DC. (2001). Environmental Protection Agency US. 2001. Potential contamination due to cross-connections and backflow and the associated health risks. Office of Ground Water and Drinking Water Washington DC. (2001).