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Dr scott lecture - Water Facts A human can live up to a month without food but can survive for about a week without water Average requirement for

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1 Water Facts A human can live up to a month without food, but can survive for about a week without water. Average requirement for human consumption of water per day is approximately 2.5 liters (about 2 ½ quarts). About two-thirds of the human body is made up of water = Thus the quality of the water around you is important to your health. Water Use Statistics 2L/day/person = To sustain life 340L (90 gal.)/day/person = US Use (does not include agricultural & industrial subsidies) 5,700L (1500 gal)/day/person fed = US Use including agricultural & industrial subsidies Power Plants > Agriculture > Industrial > Communal Present and Future US Water Use 1950 – 150 million people = 700 billion L/day 1975 – 200 million people = 1,600 billion L/day 2000 – 260 million people = 2,600 billion L/day Conclusion: For every 1% increase in population, there is a 4% increase in water consumption
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2 Types of Water Marine (Oceans) 97.21% Atmosphere 0.001% Land -Ice Caps 2.15% -Subsurface Groundwater 0.625% -Surface Water 0.014% (Rivers, Lakes, Streams) Water Quality Laws Clean Water Act – priority pollutants and Water Quality Standards. The oldest Environmental Law dating back to the 1899 Rivers & Harbors Act. Regulates Point & Non Point Source (NPS) Pollution Point Sources - National Pollution Discharge Elimination System (NPDES) – mandatory -Regulates point source discharges: Control Methods-In Stream Waste Reduction, Enhanced Waste Treatment, & Waste Recycling Non Point Source (NPS) Pollution – voluntary regulations Control Methods -Best Management Practices (BMPs),Storm Water Retention Ponds, and Total Maximum Daily Loads (TMDLs) NPS runoff is the greatest pollution threat today in marine ecosystems!! Runoff “Water originating as precipitation on land that then runs off the land into rivers, streams, and lakes, eventually reaching the oceans, inland seas, or aquifers, unless it evaporates first.” Runoff is enhanced by alterations in the land surface that affect the ability of water to infiltrate soils
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3 Contaminants in Runoff Chemicals and nutrients (e.g., fertilizers, pesticides and nitrates from agricultural lands) Rubber, heavy metals, sodium (from roads) Petroleum byproducts and organic chemicals (from dry cleaners, service stations, and leaking underground storage tanks) Chemicals used in the home (solvents, paints, used motor oil, lead, and copper) Heavy metals and toxic chemicals (from factories) Microbial pathogens (from human and animal wastes) Factors Enhancing Runoff: Effect of Imperviousness 0 50 100 150 200 250 300 350 8 1 01 21 41 61 82 02 22 42 62 83 03 23 43 63 8 OHHI 2005 Watershed Hydrographs - 1st order unoff (cfs) 2-year 24-hour Storm Event (4.5" rainfal ) NORTH INLET 0 50 100 150 200 250 300 350 8 OHHI 2005 Watershed Hydrographs - 1st order Runoff (cfs) 2-year 24-hour Storm Event (4.5" rainfal) MURRELLS INLET (<3% Impervious) (49% Impervious) Water Cycle: Urbanization Effects Population Increase Murrells Inlet Storm Water Increase Murrells Inlet 1985-95: Population 70% Increase while Storm Water increased > 400% (1:5 Ratio)
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4 Point Source Pollution: National Pollution
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This document was uploaded on 11/01/2011 for the course MSCI 210 at South Carolina.

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Dr scott lecture - Water Facts A human can live up to a month without food but can survive for about a week without water Average requirement for

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