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Tag: Groundwater

Consumption of Nitrogen fertilizers in EU 15
The graph shows Consumption of Nitrogen fertilizers in EU 15 from 1970 to 1992. The main source of nitrogen in soils is from organic matter. Nitrogen also comes from sources such as factories. A common concern with these...
14 Mar 2006 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Consumption of pesticides (active ingredients)
The graphic shows consumption of pesticide (active ingredients) from 1980 to 2010. Pesticides are natural chemicals or altered versions of natural chemicals used in agriculture to control various sorts of pests such as d...
14 Mar 2006 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Development of organic matter, phosphorus and nitrate in EU 15 rivers
The graphic shows the development of organic matter, phosphorus and nitrate in EU 15 rivers. Water resources in Europe have been profoundly influenced over the past century by human activities, including the construction...
14 Mar 2006 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Trends in groundwater nitrate concentrations
The graph shows the development of Nitrate concentration in groundwater from 1980 to 1995 in France, Britain and Denmark combined. Nitrate is a naturally occurring compound and is normal in small amounts, but excess amou...
14 Mar 2006 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Trends in Nitrogen loads and concentrations, Baltic Sea, 1900-2030
The graphic show trends in Nitrogen loads and concentrations in the Baltic Sea from 1900 to 1995 with projections to 2030. The main source of nitrogen in soils is from organic matter. Nitrogen also comes from sources suc...
13 Feb 2006 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Freshwater stress
Today, the great pressure on water resources is rising human populations, particularly growing concentrations in urban areas. This diagram shows the impact of expected population growth on water usage by 2025, based on t...
07 Nov 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
South Eastern Europe to Central Asia: political transition and environmental risks
The graphic maps out the areas that are at risk, or already contaminated from nuclear industry after the break-up of the former Soviet Union. Nuclear power has unresolved problems of waste disposal. Waste remains dangero...
11 Feb 2006 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Forests Regulate Groundwater Level
Forests can regulate groundwater levels and increase drainage of soils where the water table is close to the surface. If there are salts in the upper soil layers, then removal of forests can result in raised groundw...
20 Jun 2009 - by Philippe Rekacewicz assisted by Cecile Marin, Agnes Stienne, Guilio Frigieri, Riccardo Pravettoni, Laura Margueritte and Marion Lecoquierre.
Different sources of danger and their impacts to the environment
Contaminated groundwater can adversely affect animals, plants and humans if it is removed from the ground by manmade or natural processes. Depending on the geology of the area, groundwater may rise to the surface through...
17 May 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Global freshwater resources: quantity and distribution by region
Glaciers and icecaps contain approximately 70% of the world's freshwater, but groundwater is by far the most abundant and readily available source of freshwater. This graphic illustrates the quantity (in cubic kilometres...
17 May 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Groundwater contamination from canals - Hat Yai, Thailand
In areas where surface water is not readily available (located far away from areas where it is needed), groundwater is the primary water source. This graphic shows the chloride concentration and the potassium concentrati...
17 May 2005 - by Delphine Digout, UNEP/GRID-Arendal
Groundwater: aquifers, wells and circulation
This graphic illustrates groundwater flow, two types of aquifers (confined and unconfined) and three types of wells (artesian; flowing artesian and a water table well in an unconfined aquifer). It shows how groundwater i...
17 May 2005 - by Delphine Digout, UNEP/GRID-Arendal
Freshwater availability: groundwater and river flow
This graphic shows the availability of freshwater through average river flows and groundwater recharge, in cubic metres per capita per year, at the national level in the year 2000. The graphic highlights the countries wi...
17 May 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
World's water cycle: schematic and residence time
The water cycle consists of precipitation, evaporation, evapotranspiration and runoff. This graphic explains the global water cycle, showing how nearly 577 000 km3 of water circulates through the cycle each year. A table...
17 May 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Urban water cycle
This graphic illustrates the impact of human activity on groundwater. It shows that groundwater is obtained from periurban wellfields and urban wells, then used and disposed of as wastewater through pluvial drainage, pip...
17 May 2005 - by Delphine Digout, UNEP/GRID-Arendal
Urban water supply and wastewater on a shallow aquifer
This graphic shows the changes in water supply and wastewater disposal that occur through four stages of growth of a settlement: early settlement; the town becomes a city; the city expands and the city expands further. T...
17 May 2005 - by Delphine Digout, UNEP/GRID-Arendal
Total global saltwater and freshwater estimates
Estimates of global water resources based on several different calculation methods have produced varied estimates. This graphic illustrates the proportions of saltwater and freshwater that make up the earth's water resou...
17 May 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Moldova, topographic map
Moldova is located in Eastern Europe, northeast of Romania, comprising of 33,843 sq km. It has a population of 4,455,421 (2005). Major environmental concerns are: heavy use of agricultural chemicals, including banned pes...
04 Oct 2005 - by Philippe Rekacewicz, Emmanuelle Bournay, UNEP/GRID-Arendal
Lithuania, topographic map
Lithuania is located in Eastern Europe, bordering the Baltic Sea, between Latvia and Russia, comprising of 65,200 sq km. It has a population of 3,596,617 (2005). Major environmental concerns are: contamination of soil an...
04 Oct 2005 - by Philippe Rekacewicz, Emmanuelle Bournay, UNEP/GRID-Arendal
Nigeria and the freshwater challenge
Out of the total precipitation reaching Nigeria, it can be separated into green and blue water. Green water (79% of the precipitation) represents the fraction of rainfall that generates soil moisture and which supports t...
02 Nov 2006 - by Hugo Ahlenius, UNEP/GRID-Arendal
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