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46-660: The district is elongated from southeast to northwest. The divide between the basins of the Narva and Neva Rivers crosses the district from south to north. The northwestern part of the district lies the basin of the Polist River , with both the Polist and its major right tributary , the Porusya , having their sources within the district. The Polist flows into the Lovat River and thus belongs to

92-427: A hierarchical pattern . Other terms for a drainage basin are catchment area , catchment basin , drainage area , river basin , water basin , and impluvium . In North America, they are commonly called a watershed , though in other English-speaking places, "watershed" is used only in its original sense, that of the drainage divide line. A drainage basin's boundaries are determined by watershed delineation ,

138-437: A common task in environmental engineering and science. In a closed drainage basin, or endorheic basin , rather than flowing to the ocean, water converges toward the interior of the basin, known as a sink , which may be a permanent lake, a dry lake , or a point where surface water is lost underground . Drainage basins are similar but not identical to hydrologic units , which are drainage areas delineated so as to nest into

184-449: A drainage basin, and there are different ways to interpret that data. In the unlikely event that the gauges are many and evenly distributed over an area of uniform precipitation, using the arithmetic mean method will give good results. In the Thiessen polygon method, the drainage basin is divided into polygons with the rain gauge in the middle of each polygon assumed to be representative for

230-540: A drainage boundary is referred to as watershed delineation . Finding the area and extent of a drainage basin is an important step in many areas of science and engineering. Most of the water that discharges from the basin outlet originated as precipitation falling on the basin. A portion of the water that enters the groundwater system beneath the drainage basin may flow towards the outlet of another drainage basin because groundwater flow directions do not always match those of their overlying drainage network. Measurement of

276-581: A multi-level hierarchical drainage system . Hydrologic units are defined to allow multiple inlets, outlets, or sinks. In a strict sense, all drainage basins are hydrologic units but not all hydrologic units are drainage basins. About 48.71% of the world's land drains to the Atlantic Ocean . In North America , surface water drains to the Atlantic via the Saint Lawrence River and Great Lakes basins,

322-457: A part of Pskov Okrug of Leningrad Oblast . On July 23, 1930, the okrugs were also abolished, and the districts were directly subordinated to the oblast. On January 29, 1935, the district was transferred to Kalinin Oblast , and on February 5 of the same year, Bezhanitsky District became a part of Velikiye Luki Okrug of Kalinin Oblast, one of the okrugs abutting the state boundaries of

368-480: Is referred to as " watershed management ". In Brazil , the National Policy of Water Resources, regulated by Act n° 9.433 of 1997, establishes the drainage basin as the territorial division of Brazilian water management. When a river basin crosses at least one political border, either a border within a nation or an international boundary, it is identified as a transboundary river . Management of such basins becomes

414-600: Is the Dead Sea . Drainage basins have been historically important for determining territorial boundaries, particularly in regions where trade by water has been important. For example, the English crown gave the Hudson's Bay Company a monopoly on the fur trade in the entire Hudson Bay basin, an area called Rupert's Land . Bioregional political organization today includes agreements of states (e.g., international treaties and, within

460-682: The African Great Lakes , the interiors of Australia and the Arabian Peninsula , and parts in Mexico and the Andes . Some of these, such as the Great Basin, are not single drainage basins but collections of separate, adjacent closed basins. In endorheic bodies of water where evaporation is the primary means of water loss, the water is typically more saline than the oceans. An extreme example of this

506-584: The Eastern Seaboard of the United States, the Canadian Maritimes , and most of Newfoundland and Labrador . Nearly all of South America east of the Andes also drains to the Atlantic, as does most of Western and Central Europe and the greatest portion of western Sub-Saharan Africa , as well as Western Sahara and part of Morocco . The two major mediterranean seas of the world also flow to

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552-669: The Lsta , a left tributary of the Sorot. The southwest of the district belongs to the basin of the Alolya River , another right tributary of the Velikaya. There are many lakes in the district, with the largest ones being Lakes Polisto , Alyo , Tsevlo , Kamennoye , and Dubets . 27.6% of the district's territory is covered by forests, predominantly deciduous. Further 44% is occupied by agricultural lands. The Polistovsky Nature Reserve , located mostly in

598-718: The Mississippi (3.22 million km ), and the Río de la Plata (3.17 million km ). The three rivers that drain the most water, from most to least, are the Amazon, Ganges , and Congo rivers. Endorheic basin are inland basins that do not drain to an ocean. Endorheic basins cover around 18% of the Earth's land. Some endorheic basins drain to an Endorheic lake or Inland sea . Many of these lakes are ephemeral or vary dramatically in size depending on climate and inflow. If water evaporates or infiltrates into

644-781: The Nile River ), Southern , Central, and Eastern Europe , Turkey , and the coastal areas of Israel , Lebanon , and Syria . The Arctic Ocean drains most of Western Canada and Northern Canada east of the Continental Divide , northern Alaska and parts of North Dakota , South Dakota , Minnesota , and Montana in the United States, the north shore of the Scandinavian peninsula in Europe, central and northern Russia, and parts of Kazakhstan and Mongolia in Asia , which totals to about 17% of

690-464: The Soviet Union . On May 11, 1937, the district was transferred to Opochka Okrug . On May 4, 1938, the district was directly subordinated to Kalinin Oblast. Between 1941 and 1944, Bezhanitsky District was occupied by German troops. On August 22, 1944, the district was transferred to newly established Velikiye Luki Oblast . On October 2, 1957, Velikiye Luki Oblast was abolished, and

736-414: The groundwater . A drainage basin is an area of land where all flowing surface water converges to a single point, such as a river mouth, or flows into another body of water, such as a lake or ocean. Velikiye Luki Oblast 56°20′N 30°32′E  /  56.333°N 30.533°E  / 56.333; 30.533 Velikiye Luki Oblast (Russian: Великолукская область , Velikolukskaya oblast )

782-758: The Andes. The Indian Ocean 's drainage basin also comprises about 13% of Earth's land. It drains the eastern coast of Africa, the coasts of the Red Sea and the Persian Gulf , the Indian subcontinent , Burma, and most parts of Australia . The five largest river basins (by area), from largest to smallest, are those of the Amazon (7 million km ), the Congo (4 million km ), the Nile (3.4 million km ),

828-701: The Atlantic. The Caribbean Sea and Gulf of Mexico basin includes most of the U.S. interior between the Appalachian and Rocky Mountains , a small part of the Canadian provinces of Alberta and Saskatchewan , eastern Central America , the islands of the Caribbean and the Gulf, and a small part of northern South America. The Mediterranean Sea basin, with the Black Sea , includes much of North Africa , east-central Africa (through

874-598: The US, interstate compacts ) or other political entities in a particular drainage basin to manage the body or bodies of water into which it drains. Examples of such interstate compacts are the Great Lakes Commission and the Tahoe Regional Planning Agency . In hydrology , the drainage basin is a logical unit of focus for studying the movement of water within the hydrological cycle . The process of finding

920-447: The administrative center in the selo of Chikhachyovo was established. It included parts of Bezhanitsky and Loknyansky Districts. The district was a part of Velikiye Luki Okrug of Kalinin Oblast. On May 11, 1937, the district was transferred to Opochka Okrug. On May 4, 1938, the district was directly subordinated to Kalinin Oblast. Between 1941 and 1944, Ashevsky District was occupied by German troops. On August 23, 1944, it

966-648: The basin of the Neva. The Loknya River , a left tributary of the Lovat, makes up a stretch of the border with Loknyansky District. Some areas in the south of the district are in the basin of the Loknya. The western part of the district belongs to the basin of the Velikaya River . The rivers in the northwest of the district drain into the Sorot , a major right tributary of the Velikaya, and into

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1012-406: The basin, it can form tributaries that change the structure of the land. There are three different main types, which are affected by the rocks and ground underneath. Rock that is quick to erode forms dendritic patterns, and these are seen most often. The two other types of patterns that form are trellis patterns and rectangular patterns. Rain gauge data is used to measure total precipitation over

1058-738: The basis of the district's economy and employs over 22% of the population. The main product is dairy, with growing and processing of flax also being important. The railway connecting St. Petersburg and Vitebsk crosses the district from north to south. Bezhanitsy is connected by road with Porkhov , Velikiye Luki (via Loknya ), and Novorzhev . There are also local roads with bus traffic originating from Bezhanitsy. The district contains four cultural heritage monuments of federal significance and additionally twenty-two objects classified as cultural and historical heritage of local significance. The federally protected monuments are two churches and two archeological sites. The major places of interest in

1104-482: The center of Prikhabsky District was transferred to the selo of Usmyn , and in 1948, the district was renamed Usmynsky District. In 1952, Ust-Dolyssky District with the center in the selo of Ust-Dolyssy was established. The most important authority in the oblast was the first secretary of the CPSU Oblast Committee. The following persons were the first secretaries, On 2 October 1957 Velikiye Luki Oblast

1150-548: The course of World War II . It included twenty-three districts, Kholmsky District was transferred from Novgorod Oblast , Belsky, Ilyinsky, and Usvyatsky Districts were transferred from Smolensk Oblast , and other districts were split off from Kalinin Oblast . On 10 March 1945 four more districts, Podberezinsky (with the administrative center located in Podberezye ), Porechensky ( Porechye ), Prihabsky ( Prikhaby ), and Zharkovsky ( Zharkovsky ), were established. In 1948,

1196-430: The discharge of water from a basin may be made by a stream gauge located at the basin's outlet. Depending on the conditions of the drainage basin, as rainfall occurs some of it seeps directly into the ground. This water will either remain underground, slowly making its way downhill and eventually reaching the basin, or it will permeate deeper into the soil and consolidate into groundwater aquifers. As water flows through

1242-486: The district are: Drainage basin A drainage basin is an area of land in which all flowing surface water converges to a single point, such as a river mouth , or flows into another body of water , such as a lake or ocean . A basin is separated from adjacent basins by a perimeter, the drainage divide , made up of a succession of elevated features, such as ridges and hills . A basin may consist of smaller basins that merge at river confluences , forming

1288-457: The district was abolished and split between Dedovichsky and Bezhanitsky Districts. Another district established on August 1, 1927 was Kudeversky District with the administrative center in the selo of Kudever . It included parts of former Novorzhevsky Uyezd. The district was a part of Pskov Okrug of Leningrad Oblast. On September 20, 1931, Kudeversky District was abolished and merged into Novorzhevsky District. On March 5, 1935, it

1334-463: The district was transferred to Pskov Oblast. On August 28, 1958, Krasny Luch was granted work settlement status, and on August 7, 1961, Bezhanitsy followed. On August 1, 1927, Chikhachyovsky District was established as well, with the administrative center in the selo of Chikhachyovo . It included parts of former Novorzhevsky and Porkhovsky Uyezds . The district was a part of Pskov Okrug of Leningrad Oblast. On January 1, 1932,

1380-441: The drainage area is dependent on the soil type. Certain soil types such as sandy soils are very free-draining, and rainfall on sandy soil is likely to be absorbed by the ground. However, soils containing clay can be almost impermeable and therefore rainfall on clay soils will run off and contribute to flood volumes. After prolonged rainfall even free-draining soils can become saturated , meaning that any further rainfall will reach

1426-621: The drainage basin of the Polist in the northwest of the district, is one of the first wetland preserves in Russia, founded in 1994. It was created to protect the raised bog landscapes of the Polist-Lovat Swamp System . In the course of the administrative reform carried out in 1708 by Peter the Great , the area was included into Ingermanland Governorate (known since 1710 as Saint Petersburg Governorate ). In 1727, separate Novgorod Governorate

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1472-692: The drainage basin to the mouth, and may accumulate there, disturbing the natural mineral balance. This can cause eutrophication where plant growth is accelerated by the additional material. Because drainage basins are coherent entities in a hydrological sense, it has become common to manage water resources on the basis of individual basins. In the U.S. state of Minnesota , governmental entities that perform this function are called " watershed districts ". In New Zealand, they are called catchment boards. Comparable community groups based in Ontario, Canada, are called conservation authorities . In North America, this function

1518-435: The ground and along rivers it can pick up nutrients , sediment , and pollutants . With the water, they are transported towards the outlet of the basin, and can affect the ecological processes along the way as well as in the receiving water body . Modern use of artificial fertilizers , containing nitrogen (as nitrates ), phosphorus , and potassium , has affected the mouths of drainage basins. The minerals are carried by

1564-744: The ground at its terminus, the area can go by several names, such playa, salt flat, dry lake , or alkali sink . The largest endorheic basins are in Central Asia , including the Caspian Sea , the Aral Sea , and numerous smaller lakes. Other endorheic regions include the Great Basin in the United States, much of the Sahara Desert , the drainage basin of the Okavango River ( Kalahari Basin ), highlands near

1610-418: The rainfall on the area of land included in its polygon. These polygons are made by drawing lines between gauges, then making perpendicular bisectors of those lines form the polygons. The isohyetal method involves contours of equal precipitation are drawn over the gauges on a map. Calculating the area between these curves and adding up the volume of water is time-consuming. Isochrone maps can be used to show

1656-625: The responsibility of the countries sharing it. Nile Basin Initiative , OMVS for Senegal River , Mekong River Commission are a few examples of arrangements involving management of shared river basins. Management of shared drainage basins is also seen as a way to build lasting peaceful relationships among countries. The catchment is the most significant factor determining the amount or likelihood of flooding . Catchment factors are: topography , shape, size, soil type, and land use (paved or roofed areas). Catchment topography and shape determine

1702-461: The river rather than being absorbed by the ground. If the surface is impermeable the precipitation will create surface run-off which will lead to higher risk of flooding; if the ground is permeable, the precipitation will infiltrate the soil. Land use can contribute to the volume of water reaching the river, in a similar way to clay soils. For example, rainfall on roofs, pavements , and roads will be collected by rivers with almost no absorption into

1748-418: The speed with which the runoff reaches a river. A long thin catchment will take longer to drain than a circular catchment. Size will help determine the amount of water reaching the river, as the larger the catchment the greater the potential for flooding. It is also determined on the basis of length and width of the drainage basin. Soil type will help determine how much water reaches the river. The runoff from

1794-415: The time taken for rain to reach the river, while catchment size, soil type, and development determine the amount of water to reach the river. Generally, topography plays a big part in how fast runoff will reach a river. Rain that falls in steep mountainous areas will reach the primary river in the drainage basin faster than flat or lightly sloping areas (e.g., > 1% gradient). Shape will contribute to

1840-477: The time taken for runoff water within a drainage basin to reach a lake, reservoir or outlet, assuming constant and uniform effective rainfall. Drainage basins are the principal hydrologic unit considered in fluvial geomorphology . A drainage basin is the source for water and sediment that moves from higher elevation through the river system to lower elevations as they reshape the channel forms. Drainage basins are important in ecology . As water flows over

1886-753: The world's land. Just over 13% of the land in the world drains to the Pacific Ocean . Its basin includes much of China, eastern and southeastern Russia, Japan, the Korean Peninsula , most of Indochina, Indonesia and Malaysia, the Philippines, all of the Pacific Islands , the northeast coast of Australia , and Canada and the United States west of the Continental Divide (including most of Alaska), as well as western Central America and South America west of

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1932-536: Was an oblast (a first-level administrative and municipal unit) of the Russian SFSR from 1944 to 1957. Its seat was in the city of Velikiye Luki . The oblast was located in the northwest of European Russia, and its territory is currently divided between Novgorod , Pskov , and Tver Oblasts. Velikiye Luki Oblast was established on 22 August 1944, one day before Pskov Oblast, to administrate areas of Soviet Union previously occupied by German troops and liberated in

1978-417: Was included into newly established Pskov Oblast. On February 1, 1963, the district was abolished and merged into Bezhanitsky District. The largest industrial enterprise of the district is Krasny Luch Glass-Works, which is one of the oldest glass-works. The works produces light glass, consumer goods, and decorative glass items. It is located in the urban-type settlement of Krasny Luch . Agriculture forms

2024-408: Was located on the road connecting Porkhov and Velikiye Luki , quickly developed as a center of yam (state-sponsored transportation). On August 1, 1927, the uyezds were abolished, and Bezhanitsky District was established, with the administrative center in the selo of Bezhanitsy. It included parts of former Novorzhevsky Uyezd. The governorates were abolished as well, and the district became

2070-533: Was re-established as a part of Velikiye Luki Okrug of Kalinin Oblast; on May 11, 1937, the district was transferred to Opochka Okrug. On August 22, 1944, the district was transferred to Velikiye Luki Oblast. On October 2, 1957, Velikiye Luki Oblast was abolished, and Kudeversky District was transferred to Pskov Oblast. On January 14, 1958, Kudeversky District was abolished and split between Bezhanitsky, Novorzhevsky, Opochetsky, and Pustoshkinsky Districts . On June 1, 1936, Ashevsky District with

2116-399: Was split off, and in 1772, Pskov Governorate (which between 1777 and 1796 existed as Pskov Viceroyalty ) was established. The area was a part of Pustorzhevsky Uyezd, which in 1777 was renamed Novorzhevsky Uyezd of Pskov Viceroyalty. In 1796, when the viceroyalty was abolished, the uyezd was abolished as well; however, it was re-established in 1802. In the mid-18th century, Bezhanitsy, which

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