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Latvia

Year: 2016 Revision date: -- Revision type: --

Regional report: Eastern Europe

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Geography, climate and population

Geography

Latvia is one of the three Baltic states. It is bordered in the northeast by Estonia, in the east by the Russian Federation, in the southeast by Belarus, in the south by Lithuania and in the west and northwest by the Baltic Sea and the Gulf of Riga. Its total area is 64 490 km². The country became independent from the Soviet Union in May 1990. Administratively, Latvia is divided into 110 municipalities and 9 cities. The capital city is Riga.

Latvia consists of a continental part in the east and the Kurzeme peninsula (Kurland) in the west. The continental part consists of morainic uplands that are crossed by several rivers flowing to the lowlands, of which the main ones are the Daugava, Gauja and Salaca rivers. The highest point of the country is in the Vidzeme uplands with an altitude of 312 m above sea level. The continental part is separated from the peninsula in the west by the Lielupe river, which flows through the Zemgale plain. In the peninsula are the Kurzeme uplands, which are lower than the continental uplands and crossed by several rivers, of which the Venta river is the most important. The highest point in these uplands is at 184 m above sea level. About 57 percent of the country lies below 100 m above sea level and only 2.5 percent lies above 200 m.

The agricultural area, which is the sum of arable land, permanent crops and permanent meadows and pasture, is estimated at 1.9 million ha, which is 29 percent of the total area of the country. In 2013, the total physical cultivated area was estimated at 1.2 million ha, of which 99.5 percent (1 208 000 ha) consisted of temporary crops and 0.5 percent (6 000 ha) of permanent crops (Table 1).


The soils in Latvia are generally not very fertile. Around 230 000 ha are threatened by wind erosion and around 380 000 ha by water erosion. According to various estimates, marshes cover 5-10 percent of the total area of the country. Some swamps of peat ground reach a depth of 5 m. The fertile marshy black soils can be found only in the Zemgale plain.

Climate

The average annual air temperature in Latvia is 6°C, varying from -5ºC in January and February to 17°C in July. Average minimum and maximum temperature are -8ºC and 22°C respectively. The average annual precipitation in Latvia is 667 mm, ranging from 33 mm in February and March to 78 mm in July. Annual average relative humidity is 81 percent (LEGMC, 2016).

Four climatological regions can be distinguished in Latvia:

  • The coastal region, covering 25 percent of the country, includes the Zemgale plain and the whole coastal region from Lithuania to Estonia. The average annual precipitation is 600 mm. The average temperature varies from -3°C in January to 16.5°C in July. Humidity is low.
  • The Latgale region, covering 28 percent of the country, includes the southeast of the country. The average annual precipitation is 700 mm. The average temperature varies from -7°C in January to 17°C in July. Humidity is high.
  • The Vidzeme region, covering 30 percent of the country, includes the northeastern inland part of the country. The average annual precipitation is 700-850 mm. The average temperature varies from -7°C in January to 16.5°C in July. Humidity is high.
  • The Kurzeme region, covering 17 percent of the country, includes the inland part of the Kurzeme peninsula. The average annual precipitation is 700-850 mm. The average temperature varies from -4°C in January to 16.5°C in July. There is medium humidity.

Overall, during the 20th century the average air temperature in Latvia has risen by 1 degree due to climate change. From the beginning of the second half of the 20th century, fluctuations in annual rainfall have risen (LEGMC, 2016).

Population

In 2015, the total population was about 2 million, of which around 31 percent was rural (Table 1). Average population density in the country is 31 inhabitants/km². The average annual population growth rate in the 2005-2015 period has been estimated at minus 1 percent.

In 2014, the Human Development Index (HDI) ranks Latvia 46 among 188 countries, while the Gender Inequality Index (GII) ranks it 36 among 155 countries, for which information was available. Life expectancy is 74 years and the under-five mortality is 8 per 1000 births, both progressing from 68 years and 24 per 1000 in the 1990s. With no significant distinction between boys and girls, around 96 percent of the children in 2013 are enrolled in primary education, but only 87 percent for secondary education (WB, 2015). Adult literacy is 99.9 percent in 2012 (UNDP, 2015). In 2015, 99 percent of the total population had access to improved water sources (100 and 98 percent in urban and rural areas respectively) and 88 percent of the total population had access to improved sanitation (91 and 82 percent in urban and rural areas respectively) (JMP, 2015).

Economy, agriculture and food security

In 2014, the gross domestic product (GDP) was US$ 31 921 million and agriculture accounted for 3 percent of GDP, while in 1994 it accounted for 9 percent.

Until 1989, 60 percent of the area was cultivated by kolkhoz (collective farms) and 40 percent by sovkhoz (state farms). In 1989, as a result of the proclamation of the “Act on Land Reform in Rural Areas”, private farms started developing.

At present, Latvia is a small, open economy with exports contributing nearly a third of GDP. Due to its geographical location, transit services are highly developed, along with timber and wood-processing, agriculture and food products, and manufacturing of machinery and electronics industries (CIA, 2015).

The crops with a largest harvested area are cereals, followed by rape, potatoes and vegetables (CBS, 2016).

Water resources

Surface water and groundwater resources

There are more than 12 400 rivers in the country (GWP, 2011). The major rivers are Daugava, Lielupe, Gauja, Venta, and Salaca.

According to the Law on Water Management Latvia is divided into four river basin districts (RBD) (EC, 2015; EEA, 2015):

  • Daugava, including two basins:
    • Daugava river basin: Its total area is 87 900 km², of which just over one quarter is located in Latvia. The Daugava river rises in the Russian Federation, flows through Belarus (where it is called the Western Dvina), enters Latvia in the southeast and flows northwest to the Gulf of Riga. Several tributaries enter the Daugava river in Latvia, including three large ones: Ogre, Aiviekste and Dubna. The Rezekne and Pededze rivers are two important tributaries of the Aiviekste river.
    • Velikaya river basin: This basin consists of a number of smaller rivers flowing into the Velikaya in the Russian Federation. The Velikaya river is a major tributary of Lake Peipus and belongs to the basin of the Narva river which is predominantly in Estonia. Its area within Latvia is 3 200 km². The main tributaries flowing from Latvia to the Velikaya river are the Sinyaya (Zilupe in Latvian) river which originates in Belarus, the Ultroya river and the the Kukhva (Kukova in Latvian) river. The total discharge of the Velikaya amounts to 4 200 million m³/year, of which 16 percent is generated within Latvia.
  • Gauja, including two basins:
    • Gauja river basin: Its total area is 8 900 km², of which almost 95 percent is situated in Latvia. The Gauja river rises in the Vidzeme upland and flows east, then turns northwest, becomes the border between Latvia and Estonia for a short distance, and then flows southwest to the Gulf of Riga.
    • Salaca river basin: It covers the north of the country, near the border with Estonia. Its total area is 3 600 km², of which more than 95 percent is located in Latvia. The Salaca river rises in Lake Burtnieks in the north and flows west to the Gulf of Riga.
  • Lielupe, including one basin:
    • Lielupe river basin: Its total area is 17 600 km², of which about half is situated in Latvia. The Lielupe river rises in Lithuania, enters Latvia in the south and flows north to the Gulf of Riga through the most fertile regions of the country. It has many tributaries, the most important being the Memele, Lecava and Svete. The Musa river is a tributary of the Memele river.
  • Venta, including three basins:
    • Venta river basin; Its total area is 11 800 km², of which almost two thirds is situated in Latvia. The Venta river rises in Lithuania, enters Latvia in the southwest and flows north through the Kurzeme lowland to the Baltic Sea. The Venta has many tributaries, but only one of them, the Abava river, exceeds 100 km in length.
    • Coastal west basin: It includes the small river basins at the west coast with a total area of 5 100 km². It includes rivers such as the Barta, Durba, Riva and Uzava, which flow to the Baltic Sea.
    • Coastal north basin: It includes the small river basins within the coastal lowland on the opposite shores of the Gulf of Riga. Their combined area is 3 800 km². This area includes rivers such as the Irbe, Stonde, Roja, Svetupe and Vitupe.

Internal renewable surface water resources (IRSWR) are estimated at 16 540 million m³/year (Table 2) and incoming surface water resources at 17 999 million m³/year. Therefore, the total renewable surface water resources (RSWR) are estimated at 34 539 million m³/year.


Depending on the physical and geographical conditions, a large part of the river discharge comes from either snow melt, groundwater or direct surface runoff. About 50-55 percent of the waters of the Daugava, Venta, Lielupe and Musa rivers is melted snow, while for the Gauja and Amata rivers it is 35-40 percent. About 10-20 percent of the flow of some tributaries of the Lielupe (Memele and Svete) and the Aiviekste tributary of the Daugava is fed by groundwater, while for the Daugava and Gauja rivers it is 35-40 percent. In the Kurzeme peninsula and in the middle uplands, direct surface runoff accounts for 40 percent of flow of the rivers, while in the Zemgale plain it represents 20-30 percent.

Internal renewable groundwater resources are estimated at 4 700 million m³/year. Part of the groundwater flows to the sea or is withdrawn by wells, and part is drained by the surface network. That part of the groundwater flow which does not contribute to the total IRWR (overlap) is estimated at 4 300 million m³/year. This brings the internal renewable water resources (IRWR) to 16 940 million m³/year (16 540+4 700-4 300) and the total renewable water resources (TRWR) to 34 939 million m³/year (34 539+4 700-4 300) (Table 3).


Artificial groundwater recharge takes place in several well fields in Baltezers that are used for Riga city water supply. A hydrogeological modelling and field investigation has shown that artificial recharging of groundwater resources in Baltezers does not put at risk groundwater quality to exceed permitted parameters’ values for drinking water. (LEGMA; 2005; Spalvinš et al, 2008).

In 2009, produced municipal wastewater was estimated at 282 million m³, treated municipal wastewater at 128 million m³ and direct use of treated municipal wastewater at 12 million m³.

Lakes and dams

There are about 2 250 lakes with a total area of about 850 km², most of them being small lakes with more than 10 000 lakes having a surface area of less than 1 ha (LEGMA; 2005). About 36 percent of the lakes in Latvia are located in the Latgale upland in the southeast of the country. Lubans lake in the Daugava river basin is the largest lake with a surface area of almost 100 km².

Dams have been constructed for two main reasons: to control floods and to build hydro-electric power stations. Before the Second World War, about 300 such stations had been built. After the Second World War, the construction of another 547 small stations was planned, but only 267 were built. At present, no small power stations are functioning, though the reservoirs still exist.

Three large hydropower dams have been constructed on the Daugava river, with a total full reservoir capacity of 1 005 million m³: (1) the Kegums reservoir, with an area of 25 km² and a full capacity of 157 million m³, was constructed in 1947; (2) the Plavinas reservoir, with an area of 35 km² and a full capacity of 509 million m³, was constructed in 1965; (3) the Riga reservoir, with an area of 42 km² and a full capacity of 339 million m³, was constructed in 1976.

International water issues

All of the River Basin Districts (RBD) are transboundary river basins. The Gauja RBD is shared with Estonia and the Lielupe RBD and the Venta RBD are shared with Lithuania. The Daugava RBD is shared with Belarus, Lithuania and Russian Federation and it also includes a very small part of the Lake Peipus-Narva river basin which is predominantly in Estonia (EC, 2012, EC, 2015; EEA, 2015).

The Daugava, Lielupe and Venta rivers are included in the list of European Main Transboundary Surface Waters. The water quality problems of these rivers can only be solved by means of international agreements, in compliance with the mechanisms provided in the Helsinki Convention on “Use and protection of transboundary watercourses and international lakes” adopted in 1992 and ratified by Latvia in 1996 (MoERD, 2016).

Coordination of some River Basin Management Plans (RBMP) elements with Lithuania has occurred, but a joint RBMP has not been elaborated. An intergovernmental commission on transboundary cooperation between these two countries was set up following the “Agreement on Transfrontier Cooperation between the Government of Lithuania and the Government of Latvia” signed in 1999. Cooperation with Lithuania seeking to create a joint River Basin District Management Plan will continue on the basis of this agreement and pursuant to the Technical Protocol of Cooperation in the Management of International River Basin Districts, signed between the Ministry of Environment of Lithuania and the Ministry of Environment of Latvia in 2003.

A draft agreement between Latvia, Belarus and the Russian Federation on the Western Dvina/Daugava river basin, establishing a joint commission, was finalized in 2003. Latvia approved the draft but it was not signed as Russia and Belarus postponed the final decision several times due to various reasons. After joining the European Union (EU) in 2004, water quality became a topic of shared responsibility between the Member States and the EU. Therefore, any international agreement on water management between an EU Member State and a non-Member State requires the EU as a Contracting Party. Cooperation agreements were on the list of topics to be discussed during high-level meetings of the EU and the Russian Federation. However, this has not led to renewal of the negotiations concerning river basin management agreement. Latvia has no framework agreement with Belarus and Russian Federation on cooperation in river basin management (ECE, 2009; EC, 2012).

In 2003 and 2004, several seminars were held for Baltic experts to discuss identification of river basin districts, proposed typology and characteristics of surface water. Even if they have not led to a harmonized typology, experts had a regular information exchange with neighbouring colleagues. In 2003, permanent working groups were established in accordance with the agreements concluded between the Ministries of the Environment of Latvia and Lithuania and of Latvia and Estonia (LEGMA, 2005).

Latvia and Estonia cooperate on establishing, updating and implementing water management plans for the cross-border Gauja/Koiva river basin. This joint project also supports the preparation of a joint water management plan, combining the water management plans of the two countries. The first river basin management plans were produced separately (MoE of Estonia, 2015).

The Nemunas RBD is shared with two EU Member States, Poland and Lithuania, and two non-EU countries, Belarus and the Russian Federation (Kaliningrad oblast). The governments of Lithuania, the Russian Federation, Belarus, and the European Commission have initiated the preparation of an agreement on cooperation in the use and protection of water bodies within the Nemunas River Basin District (RBD). A draft agreement has been drawn up but has not been signed yet. No measures have been foreseen for Poland and Latvia, because the part of the Nemunas RBD in Poland constitutes only 287 km² (the upstream reaches of the rivers with no significant pressures), and the part of the RBD in Latvia constitutes only 100 km² (the upstream reaches of the rivers with no significant pressures), and the results of water quality monitoring showed that the ecological status of the rivers along the Polish and Latvian border were good.

Water use

In 1995, total water withdrawal was 418 million m³, while in 2002 it had gone down to 256 million m³, mainly due to a reduction in industrial water withdrawal, probably related to a reduction in industrial activities.

In 2013, total water withdrawal was estimated at 248 million m³ of which 159 million m³ (64 percent) for municipalities, 52 million m³ (21 percent) for industry and 36 million m³ (15 percent) for agriculture of which 33 million m³ corresponds to aquaculture (Eurostat, 2016) (Figure 1 and Table 4).




In 2013, it was estimated that around 60 percent of total water withdrawal is withdrawn from groundwater, 35 percent from surface water and 5 percent comes from direct use of treated municipal wastewater (Eurostat, 2016) (Figure 2).


Groundwater is widely used for individual water supply in farms and small settlements throughout Latvia. For this purpose, mainly shallow wells and less often deep boreholes, are used (ECMC, 2000).

Irrigation and drainage

Evolution of irrigation development

In order to increase yields, improve quality and secure production, experiments with sprinkler irrigation on vegetable plantations, early potatoes and sugar beet started in the 1970s. The first sprinkler systems were installed on the “Peternicki” experimental farm in the Jelgava district and then on the “Uzvara” kolkhoz in the Bauska district and on the “Kekava” kolkhoz in the Riga district, all in the Zemgale plain. All irrigation was sprinkler irrigation.

In 2013, total area equipped for irrigation was estimated at 630 ha which was only about 0.1 percent of the total cultivated area. Actually irrigated area accounted for 410 ha, which was only about two thirds of the area equipped for irrigation in that year (Table 5). Irrigation in general is supplementary irrigation. In 2007, out of the total irrigation area of 830 ha, 93 percent was irrigated by surface water and 7 percent by groundwater (Figure 3).





Role of irrigation in agricultural production, economy and society

In 2007, the total harvested irrigated crop area was 620 ha, of which 50 percent were potatoes and 50 percent vegetables (Table 5 and Figure 4).


Status and evolution of drainage systems

For agriculture, drainage is more important than irrigation. Over 90 percent of the agricultural land in Latvia can be intensively cultivated only if drained.

The more important works connected with land drainage started in the eighteenth century in the east of the country. At the beginning of the nineteenth century, large-scale hydraulic works were carried out on the Bera, Auce, Riva and Lielupe rivers; dikes were built along the Roja, Abava, Riva and Pededze rivers; and the Starpinupe canal connecting Lake Kanieris with the Gulf of Riga was constructed. In the middle of the nineteenth century, a canal connecting Lake Lubans with the Aiviekste river was constructed. Subsurface drainage started in 1850. Until 1924, all hydraulic works were carried out without the use of any machinery. In 1924, machines and excavators were purchased, which facilitated the excavation of cross-cuts, made it possible to straighten riverbeds and to shape new ones. The first land improvement act was passed in 1937.

By 1995, almost 1.6 million ha, including agricultural land, meadows, pastures and land used for construction, had been drained. Most of this area, around 96 percent, was provided with subsurface drains, using ceramic or polymer pipes. The state only financed improvements and maintenance of the system. For 1996 and 1997, $US 3.3 million were earmarked for these purposes.

In 1994, fodder crops covered a large part of the drained area, followed by cereals, vegetables, potatoes and industrial plants. In that year, the drained lands produced 80 percent of all vegetable production. It is assumed that, generally, crop yields on drained land are 20-25 percent higher than those on undrained land.

Water management, policies and legislation related to water use in agriculture

Institutions

The following institutions are involved in water resources management:

  • The Ministry of Environmental Protection and Regional Development (MoERD) is responsible for the policy planning on water resources and sanitation, implementation and supervision of drinking water and sanitation improvement projects. It is also responsible for regional development and information and communication technologies. It ensures that natural resources are used effectively and in sustainable manner (MoERD, 2016). Amongst others, the MoERD supervises the following institutions:
    • State Environmental Service (SES), which has to ensure the implementation of the legislation framework related to environmental protection and natural resources.
    • Environment State Bureau (ESB), which carries out environmental impact assessment of proposed activities and planning documents.
    • Nature Conservation Agency (NCA), which is responsible for the management of all protected areas in Latvia.
    • The Latvian Environment, Geology and Meteorology Centre (LEGMC), which ensures water quality and quantity monitoring, as well as data quality control and availability of these data for public, river basin management, preparation of various reports for national and international institutions, as well as calculation of flood territories.
  • The Ministry of Health participates in the development of policy planning documents and legal acts. It supervises the Health Inspectorate that is responsible for the control of public drinking water supply from the water supply points to the consumer.
  • The Ministry of Agriculture has, amongst others, the responsibility of water resources protection.
  • The Latvia University of Agriculture carries out large-scale scientific research on irrigation and land reclamation.
  • The University of Latvia in Riga conducts research on hydrology, climate, geography of water resources and in environmental sciences.

Water management

Water management in Latvia is composed of two levels: central and local management. The central government is responsible for water resources protection and development, the formulation and implementation of national water policy and national macro-management of water resources. The local government is in charge of the supervision and management of water use and sewage treatment (ASEMWater, 2016).

The final version of the River basin district management plans (RBMP) was approved by the Order of the Minister of Environment in 2010. The principal objectives of the RBMPs are to prevent deterioration in the condition of the water and to improve the surface water and groundwater quality (EC, 2012).

Finances

The Latvian government and local institutions apply charges and the polluter pays principle (PPP) to water users. There is a close relationship between charge for water and manner of fetching water as well as the purpose of water use (ASEMWater, 2016).

Foreign investments in Latvia have been very important to develop the water sector. Recently, the Nordic Environment Finance Corporation (NEFCO) has invested € 5 million to upgrade wastewater treatment plants in Latvia (NEFCO, 2008).

Policies and legislation

The Law on Water Management (2002) is the main regulation in water management and protection and aims to establish a surface water and groundwater protection and management system that promotes sustainable and rational use of water resources, improves protection of water environment, ensures water protection and facilitates achievement of goals set in international agreements. The Law defines that water protection measures, their efficiency and usefulness must be controlled within river basins instead of administrative borders (MoERD, 2016).

The Law on Regulators of Public Utilities (2000) states that water supply and sewerage should be regulated by local regulators.

Environment and health

According to the information included in the river basin management plans, 51 percent of the surface water bodies are currently considered to be of high or good ecological quality. The main cause of inadequate surface water quality is eutrophication due to pollution from point and diffuse sources, morphological changes in rivers and an influx of biogens from neighbouring countries via transboundary watercourses.

Since the beginning of the 1990s the annual average concentration of nitrogen in rivers has decreased in Daugava, Gauja and Venta. In Lielupe, the concentration of nitrogen is higher due to intensive agriculture in this region. However, the recent trend indicates a small increase in nitrogen concentrations in all rivers. More than 70 percent of the total nitrogen and more than 40 percent of the total phosphorus inland load is caused by various human activities. The main source of nitrogen is agriculture while the main source of phosphorus is municipal and industrial wastewater (EEA, 2015).

Water pollution in wells may be due to their placement at insufficient distances from the organic or bacteriological pollution sources (cattle-sheds, toilets, etc.). The reasons for water quality being non-compliant with required standards were mostly due to high iron content and organoleptic qualities (ECMC, 2000).

Water protection is one of the main priorities in the environmental protection policy of the country. Currently good results have already been achieved. Wastewater treatment has been improved significantly (MoERD, 2016).

Sea water intrusion has been observed in the Famenian aquifer system in Liepaja in the southwest of the country. It was caused by very intensive abstraction of groundwater. Indirect intrusion of sea water through Daugava river bed is observed in the Arukula-Amata aquifer system in the centre of Riga region. In both sites groundwater bodies have been identified as being at risk (LEGMA, 2005).

Prospects for agricultural water management

Freshwater resources far exceed present and future requirements for water consumption (EEA, 2015). The government focuses its policy and activities for the future mainly on water protection.

Main sources of information

ASEMWater. 2016. Website of ASEMWater. The Republic of Latvia. ASEM Water Resources Research and Development Center.

CIA. 2015. The World Fact Book: Latvia. Central Intelligence Agency.

CSB. 2016. CBS website. Central Bureau of Statistics of Latvia.

EEA. 2015. Freshwater – State and impacts (Latvia). European Environment Agency.

EC. 2012. Commission staff working document. Member State: Latvia. Accompanying the document Report from the Commission to the European Parliament and the Council; on the implementation of the Water Framework Directive (2000/60/EC); River Basin Management Plans. European Commission.

EC. 2015. European Commission websiste. Environment. Latvia. European Commission.

ECE. 2009. Capacity for water cooperation in Eastern Europe, Caucasus and Central Asia. Economic Commission for Europe.

ECMC. 2000. Latvian State of the Environment Report (1998). Environmental Consulting and Monitoring Centre of the Ministry of Environmental Protection and Regional Development.

Eurostat. 2016. Eurostat Database.

Feldmane J, Sleže S, Auzina A and Kadikis N. 2011. Water and Health Protocol implementation in Latvia. Seminar for Nordic and Baltic countries “Drinking water and sanitation in a Nordic and Baltic perspective –common challenges and collaboration“ Oslo 07.11-08.11.2011.

Friedrich V. 2002. Feasibility study for stabilising the Plavinas dam, Latvia.

GWP. 2011. Website of GWP. Latvia. Global Water Partnership.

JMP. 2015. Progress on drinking water and sanitation – 2015 Update and MDG Assessment. WHO/UNICEF Joint Monitoring Programme for Water Supply and Sanitation.

Jurgelane I. 2013. Water management services regulation in Latvia: principles and development trends.

LEGMA. 2005. Characteristics of the Latvian river basin districts. A review of the impact of human activity on the status of surface waters and on groundwater. Economic analysis of water use (Article 5 report). Lativan Environment, geology and meteorology agency.

LEGMC. 2016. Climate of Latvia. Latvian Environment, Geology and Meteorology Centre.

Mezals, A. 2012. Water management sector regulation in Latvia. Public Utilities Commission of Latvia. Deputy Director of Municipal Service and Railway Transport Department, Head of Municipal Service Division.

MoE of Estonia. 2015. Website. River basin management plans. Ministry of the Environment of Estonia.

MoERD. 2016. Website of MoERD. Ministry of Environmental Protection and Regional Development.

NEFCO. 2008. NEFCO finances waste water treatment plants in Latvia. The Nordic Environment Finance Corporation.

Spalvinš, A., Gavena, I., Aleksans, O., Juhna, V. 2008. Artificial Recharging of Ground Water Resources Experience in Well Field “Baltezers” (Latvia). In: Proceedings of Congress “Water: Ecology and Technology” (ECWATECH-2008), Russia, Moscow, 4-5 June, 2008. Moscow: Crocus Expo Exhibition Center, 2008, pp.1-7.

UNDP. 2015. Human Development Reports: Data. United Nations Development Programme. New York.

World Bank. 2015. World Development Indicators. World DataBank. World Bank. Washington.

     
   
   
       
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