U-X-L encyclopedia of water science - Issues by K. Lee Lerner, K. Lee Lerner, Brenda Wilmoth Lerner

By K. Lee Lerner, K. Lee Lerner, Brenda Wilmoth Lerner

U?·X?·L® Encyclopedia of Water technology explores water technology and matters from a global viewpoint. subject matters lined contain lakes and streams, oceans, aquatic animals, climate and weather, glaciers, wetlands, ecology, hydropower, advertisement fishing, acid rain, activity, toxins, economics, water conservation, overseas water legislations, international warming and lots more and plenty extra. quite a few sidebars spotlight major evidence and evaluations, offer biographies, clarify allusions and describe water-related actions. supplied in each one access are definitions for clinical phrases and assets for additional examine. A common word list, an index, greater than one hundred fifty black-and-white pictures, and a distinct set of colour picture inserts are integrated in every one quantity. (20050801)

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This is because the amount of water that is taken from the ground is more than balanced out by the amount of water that goes back into the ground as rainfall, melting snow, floodwater or other sources. However, when a community relies on one or a series of wells for its water supply, the total amount of water that is withdrawn from the groundwater source can be large. If an area experiences a drought (prolonged shortage of rainfall), water consumption rises, or wells are placed too close together, then more groundwater can be taken than is replenished.

They can kill or harm organisms in the water, such as fish, and sicken animals and people who eat these organisms. In 2002 scientists found unhealthy levels of mercury in salmon taken from waters off the Pacific Northwest and urged the public to limit consumption of salmon to one serving per week. Pathogens. Pathogens are microorganisms that can cause disease. Examples of pathogens include certain types of bacteria, viruses, and protozoa. Water that is contaminated with human or animal feces (such as sewage, waste from farms, and fluid leaking from landfills) often contains harmful microorganisms.

The project was designed to prevent flooding along about 600 miles (957 kilometers) of the river from Cape Girardeau, Missouri to New Orleans, Louisiana. 402 U•X•L Encyclopedia of Water Science The project led to the construction of a series of dams and levees (walls built to hold back and channel flood water) to control the Mississippi River. Deep channels called floodways also provide a path for floodwaters. Dams can be opened to allow water out of the river and into these floodways. Most floodways are located near areas that flood easily (low-lying floodplains).

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