Terms in this set (58)
drip irrigation/ microirrigation
_____ or _____ systems are very efficient, reduce water waste, and have flexibility.
_____ keep the price of water so low that users do not worry about water waste.
The _____, supples massive amounts of water to urban and rural developments in dry climates.
water hot spots
Areas that do not have enough water are termed _____.
_____ involves replacing grasses with native plants and sharply reduces water use.
A _____ is a flat tract of land bordering a river, mainly in its lower reaches, and is formed by the water's flow downstream.
Serious water shortages are emerging as the demand for water in many countries simply outruns the supply forcing people to live in _____.
_____ is the application of water (or wastewater) to land areas to supply the water (and some nutrient) needs of plants
_____ generally comes from snowmelt and storm runoff and is added to an aquifer.
A _____ system relies on unsaturated conditions (material cannot be fully immersed in water), where aerobic bacteria and fungi break down wastes.
When a lot of water is pumped from an aquifer, or when there is a dry spell, the water table _____.
To tap groundwater in an aquifer, wells are dug until they reach the _____ of the aquifer.
_____ increases with economic and urban development.
_____ speeds up water flow but also disturbs the migration and spawning of fish species.
More than half
_____ the water available for use is lost through evaporation, wastes, irrigation, overuse, etc.
The location of water, type of water, and demand for water _____ available water supplies.
Stream channelization increases the rate of _____.
Rapid population growth in the Himalayan watershed contributes to flooding in _____.
The _____ can wash away topsoil and crops, cause water to overflow its channels, and leach soil nutrients.
Floods and droughts are _____ problems.
The main human activity that increases flooding is _____.
_____ or _____ offers the greatest conservation of water.
In the west, most water use is based on _____.
In the East, most water use is base on _____.
_____ allow a person who owns land adjoining a flowing stream to use the stream.
The World Resources Institute estimates that _____% of the water people use throughout the world is wasted through evaporation, leaks, and other losses.
Desalinization is very _____.
positive feedback loop
The relationship between water demand and policies that subsidize water-thirsty crops exemplifies a _____.
The Ogallala Aquifer is being used _____ times faster than it is being recharged.
Currently, groundwater in the USA is being withdrawn at ____ times its replacement rate.
Overuse of _____ can lead to saltwater intrusion, subsidence, and aquifer depletion.
In water resources, the term _____ refers to sinking of ground when water has been withdrawn.
In the US, about _____ of all drinking water is pumped from aquifers.
The volume of the world's fourth largest freshwater lake has been decreased by almost _____% to provide water for agriculture. This lake is located in the former Soviet Union.
In California, the greatest user of water is _____.
California's basic water problem stems from the fact that 75% of the population lives south of _____, but 75% of the rain falls north of it.
Most _____ projects illustrate the principle that you can't do just one thing.
In _____ arizona started taking its full share of water from the Colorado River , resulting in much higher water prices for the downstream California.
Egypt's Aswan High dam saved rice and cotton crops during two droughts in the _____.
China's Three gorges project will destroy two cities each with _____ people.
Large dams and reservoirs can be used to provide _____.
Water scarcity due to increasing numbers of people relying on fixed levels of runoff is called _____.
Water can be _____ because of water stress, dry climate, desiccation and drought.
Major water problems of the _____ United States include chronic drought an insufficient runoff.
The aquifer supplying _____ is becoming severely contaminated.
_____ in the western US are dropping rapdily.
Many _____ areas do not have enough water to meet their needs.
_____ tends to consume the smallest amount of water.
Throughout the world, the most water is used for _____.
The global increase in water withdrawal since _____ is due to increased population, agriculture, industrialization, and urbanization.
Recharging water is a _____.
The water table moves down in _____.
Water in a confined aquifer is _____.
The water table is located at the top of the zone of _____.
Porous water-saturate layers of underground rock are known as _____.
Only about _____% of the world's total water supply exists as uncontaminated freshwater on or close to the surface and is readily available for human use.
Approx. ____% of Earth's water is freshwater rather than saltwater.
Liquid water _____ change the temperature very quickly.