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42-688: The major part of the district belongs to the drainage basin of the Volga River . The source of the Volga is located in the district, in the selo of Volgoverkhovye . The district is locates in the southern outskirts of the Valdai Hills , and there is a large lake district in the area of Ostashkovsky District. The biggest lakes in the area are Lake Seliger , with the town of Ostashkov located on its shore, Lake Volgo and Lake Sterzh (parts of Upper Volga Reservoir ), and Lake Sig . Both Seliger (via

84-639: A selo in Rozovsky Rural Okrug of Russko-Polyansky District in Omsk Oblast Bologoye, Pskov Oblast , a village in Novosokolnichesky District of Pskov Oblast [REDACTED] Index of articles associated with the same name This set index article includes a list of related items that share the same name (or similar names). If an internal link incorrectly led you here, you may wish to change

126-484: 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 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

168-414: 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 , 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

210-454: 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

252-540: 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

294-410: 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 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

336-487: 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

378-614: 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

420-713: 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

462-708: The Baltic Sea , and the Volga drains into the Caspian Sea . Thus, the divide between the Atlantic Ocean and the Caspian Sea runs through the district. In the course of the administrative reform carried out in 1708 by Peter the Great , the area was included into Ingermanlandia Governorate (since 1710 known as Saint Petersburg Governorate), and in 1727 Novgorod Governorate split off. In 1772, Ostashkov

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504-828: 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 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,

546-714: 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 the Andes. The Indian Ocean 's drainage basin also comprises about 13% of Earth's land. It drains

588-698: The Selizharovka River ) and Sig drain into the Volga, Verkhyaya Volga Reservoir is built in the upper course of the Volga, and the Volga flows through Lake Volgo. Minor areas in the northwest of the district belong to the basin of the Pola River in the basin of the Neva , and rivers in the northeast of the district drain to the Shlina River , also in the drainage basin of the Neva. The Neva drains into

630-621: 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. Bologoye Bologoye ( Бологое ) is the name of several inhabited localities in Russia . Urban localities Bologoye, Tver Oblast , a town in Bologovsky District of Tver Oblast Rural localities Bologoye, Omsk Oblast ,

672-470: The GDP. The main industrial enterprise in the district is Ostashkov Leather Factory. Additionally, enterprises of timber, textile, and food industries are present. The main agricultural specialization of the district is cattle breeding with meat and milk production. The railway connecting Bologoye with Velikiye Luki crosses the district from northeast to southwest. Ostashkov is the main railway station within

714-673: The Seliger Area Nature Museum was open in the settlement of Rogozha , and in 2002, the Museum of the Source of the Volga was open in Volgoverkhovye. 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

756-623: 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

798-496: The administrative center in the town of Ostashkov was established. It belonged to Velikiye Luki Okrug of Western Oblast . On August 1, 1930 the okrugs were abolished, and the districts were subordinated directly to the oblast. On January 29, 1935 Kalinin Oblast was established, and Ostashkovsky District was transferred to Kalinin Oblast. During World War II, the district was not occupied by German troops but until 1943 stayed in

840-406: 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

882-430: 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

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924-806: The district. There is infrequent passenger traffic. Ostashkov is connected by road with Torzhok via Kuvshinovo . This road crosses the district, and in Torzhok it has access to M10 highway , connecting Moscow and Saint Petersburg. Ostashkov is further connected with Staritsa via Selizharovo , with Andreapol via Peno , and with Demyansk and Maryovo . There are also local roads, with bus traffic originating from Ostashkov. The district contains 187 cultural heritage monuments of federal significance (125 of them located in Ostashkov) and additionally 287 objects classified as cultural and historical heritage of local significance (118 of them in Ostashkov). Essentially,

966-441: 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

1008-697: 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

1050-857: 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 ), the Mississippi (3.22 million km ), and the Río de la Plata (3.17 million km ). The three rivers that drain

1092-583: 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 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 ,

1134-435: 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

1176-722: 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

1218-406: The immediate vicinity of the front lines. In February 1963, during the abortive administrative reform by Nikita Khrushchev , Kirovsky and Penovsky Districts were merged into Ostashkovsky District. On January 12, 1965 Selizharovsky District (which occupied the same area as Kirovsky District), and on December 27, 1973 Penovsky District were re-established. On 12 January 1965 Andreapolsky District

1260-639: 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 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

1302-433: The limits of the district, is incorporated separately as an okrug —an administrative unit with the status equal to that of the districts. As a municipal division , the district is incorporated as Ostashkovsky Municipal District . Solnechny Okrug is incorporated separately from the district as Solnechny Urban Okrug. Industry dominates in the economy of the district. As of 2014, the industrial output represented over 90% of

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1344-514: 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

1386-418: 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

1428-631: 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

1470-461: 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

1512-418: 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

1554-415: 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

1596-477: 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

1638-644: The whole center of Ostashkov consists of listed buildings. Other federal monuments include the Nilova Pustyn monastery, located on an island on Lake Seliger, the Novyye Yeltsy Estate in the selo of Novyye Yeltsy , as well as a number of churches in the villages of the district and several acheological sites. Ostashkovsky District Museum was founded in 1889 and is located in Ostashkov. It has displays on local history and ethnography. In 1986,

1680-673: 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, 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

1722-407: Was established in the areas which previously belonged to Toropetsky and Ostashkovsky Districts. In 1990, Kalinin Oblast was renamed Tver Oblast. Within the framework of administrative divisions , Ostashkovsky District is one of the thirty-six in the oblast. The town of Ostashkov serves as its administrative center . A closed urban-type settlement of Solnechny , located geographically within

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1764-432: Was granted town status, and Ostashkovsky Uyezd of Novgorod Governorate was established, with the seat in Ostashkov. In 1775, Tver Viceroyalty was formed from the lands which previously belonged to Moscow and Novgorod Governorates, and the area was transferred to Tver Viceroyalty, which in 1796 was transformed to Tver Governorate . On 1 October 1929, governorates and uyezds were abolished, and Ostashkovsky District with

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