By Neil S Grigg; American Water Works Association

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WQ 2000 sources of water contamination Source Effects Agriculture Farm operations discharge large volumes of sediment and nutrients and smaller quantities of toxic chemicals. Accounts for wetland losses and damage to riparian and floodplain environments. Runoff from animal production is a source of phosphorus and pathogens in lakes, and agricultural chemicals threaten groundwater. Atmospheric sources Acidic or toxic substances may be deposited in lakes or estuaries. This may impair aquatic ecosystems, cause algal blooms, and even be lethal to aquatic organisms.

Kennedy School of Government. : Harvard University Press. Stone, Donald C. 1974. Professional Education in Public Works/Environmental Engineering and Administration. Chicago: American Public Works Association. US Government. 2006. Constitution of the United States. gov/paul/constitutiontext. htm. Accessed October 19, 2006. Wikipedia. 2006. Paradigm. org/wiki/Paradigm. Accessed September 28, 2006. Young, John. 2006. Challenges and Benefits of Total Water Management. Jour. AWWA 98 no. 6: 32–34. indb 18 5/5/2008 4:09:37 PM Chapter 2 Water management and its impacts Water managers face many types of issues, and to be specific let’s place TWM issues into three categories: • The water supply problem: Maintaining access to water sources without damaging the environment, • The water quality problem: Sustaining and improving water qual‑ ity for customers and the environment, and • The environmental problem: Avoiding degradation from nonpoint sources and hydrologic modification.

This chapter focuses on TWM’s arena of action and the roles in which it is required. It explains how stewardship of water resources is not only the responsibility of water utilities but of all citizens. Arenas for action of TWM If the limited supply of water is to be managed on a sustainable use basis, then all uses that affect sustainability must be considered. ” This means that the arena for action for TWM embraces all water uses. Also according to its definition, TWM will respond to the sustain‑ ability challenge if it • balances competing uses through efficient allocation by planning and managing dynamically; • adapts to changing conditions and local and regional variations; and • uses coordination and conflict resolution to reach decisions, with participation of all units of government and stakeholders.

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