Presentation on theme: "WATER. OBJECTIVES Describe the diistribution of Earth’s water resources. Explain why fresh water is one of Earth’s limited resources. Describe the."— Presentation transcript:
OBJECTIVES Describe the diistribution of Earth’s water resources. Explain why fresh water is one of Earth’s limited resources. Describe the distribution of Earth’s surface water. Describe the relationship between groundwater and surface water in a watershed.
RIVER SYSTEMS As streams and rivers move across the land they form a flowing network called RIVER SYSTEM
Some reasons rivers are important to civilization: River water is diverted for agricultural irrigation, industry, hygiene, and related uses. Carrying mineral and organic matter Food Transportation / Territorial boundaries. Hydroelectric Power Recreation Aesthetics
WHAT IS A WATERSHED? The area of land drained by a river is known as a WATERSHED. A watershed is a precipitation collector. Not all precipitation that falls in a watershed flows out
What is an Aquifer? An aquifer is an underground formation that contains water.
Pororsity and Permeability Pororsity.- is the amount of space between the particles that make up a rock. Permeability.- Is the ability of rock or soil to allow water to flow through it.
CLASSWORK What is an Aquifer? What do most of Aquifers consist? What is Porosity? What is Permeability? COMPLETE The more porous a rock is ___________
Continue… What are materials that stop the flow of water? Where do the most productive aquifers usually form? What is the Recharge Zone? What is a Watershed? What factors affect the level of the Watertable?
Objectives… Identify the patterns of global water use. Explain how water is treated so it can be safe for drinking. Describe how dams and water diversion projects are used to manage fresh water resources. Identify five ways that water can be conserved.
Global Water Use Residential Agriculture Industry
Agricultural Water Use http://www.youtube.com/watch?v=0c4ob- uPg48
One of themost effective methods Drip Irrigation: In drip irrigation water is sent through plastic pipes with holes in them. Then water slowly drips onto the crop’s roots and stems. Advantages are it is more efficient, loses less water to evaporation, and can irrigate sloping, irregularly-shaped land areas that can't be flood irrigated. It is also a positive way to water fields because it increases the amount of grain and veggies you get from the crops, and less people have to work on the fields. This is the most efficient irrigation method of the three.
Solutions for the future http://www.youtube.com/watch?v=JdN_Yx_5HzI
Classwork What are the three major uses for water in the world? Why is water aerated in the drinking water treatment process? Define the term “Potable”. What are pathogens? Identify three examples of pathogens. How much water is used to manufacture a car? (on the average)
Continues… Water is used in industry mainly to….. Write the 3 steps that show how a power plant’s cooling system works. Define the term irrigation. What is one of the most effective irrigation methods. Describe it. What is a dam ? What is a reservoir? Identify some far-reaching consequences of interrupting a river’s flow
Continues… Mention some purposes for dams and reservoirs to exist. What is XERISCAPING and what is it for? Explain what does the desalination process consist on?
Objectives… Compare point source of pollution and non- point source of pollution. Classify water pollutants by five types. Explain why groundwater pollution is difficult to clean. Describe the major sources of ocean pollution, and explain the effects of pollution on ecosystems.
Water pollution (definition) Water pollution occurs when a body of water is adversely affected due to the addition of large amounts of materials to the water. When it is unfit for its intended use, water is considered polluted. It is also the introduction of chemical, physical or biological agents into water that degrade water quality and adversely affect the organisms that depend on the water.
Sources of point pollution Septic tank systems Storage lagoons for polluted waste Municipal landfills Underground storage tanks containing pollutants such as gasoline. Public and industrial wastewater treatment plants.
Sources of nonpoint Highway construction and maintenance: eroding soil and toxic chemicals. Storm-water runoff from city and suburban streets: oil gasoline, dog feces, litter. Pesticides from croplands. Fertilizers from croplands. Salt on roads for snow and ice control.