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101-618: The history of Quakerism in Talbot County goes back as far as the earliest European settlements of the area in 1658 and 1659. By the early 1660s, at least four Friends meetings were in existence: Bayside, along the Chesapeake Bay ; Choptank and Tuckahoe , along the rivers of those names; and Michael's River, along what is now known as the Miles River . The latter of these corresponds to the first meeting of Maryland, which

202-484: 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

303-414: 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

404-454: 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

505-540: 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

606-650: A need was recognized for a new meeting house. Construction began along the river Third Haven (now known as Tred Avon ), on a 3-acre (1.2 ha) plot of land from John Edmondson, a wealthy merchant and long-standing Quaker resident of the Eastern Shore . Originally known as the "Great Meetinghouse," the house at Third Haven was to be "sixty foote long, forty four foote wide...framed with good white oak...the roof double raftered and studded," constructed with north, south, east, and west wings. The first meeting at Third Haven took place on August 14, 1684, and construction

707-644: A number of species, adding oxygen to the water and improving water clarity." Other vegetation that makes its home in other parts of the bay are wild rice , various trees like the red maple , loblolly pine and bald cypress , and spartina grass and phragmites . Invasive plants have taken a significant foothold in the bay. Plants such as Phragmites, Purple loosestrife and Japanese stiltgrass have established high levels of permanency in Chesapeake wetlands. Additionally, plants such as Brazilian waterweed , native to South America, have spread to most continents with

808-410: 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

909-658: A surface area of 4,479 square miles (11,601 km ). Average depth is 21 feet (6.4 m), reaching a maximum of 174 feet (53 m). The bay is spanned twice, in Maryland by the Chesapeake Bay Bridge from Sandy Point (near Annapolis ) to Kent Island and in Virginia by the Chesapeake Bay Bridge–Tunnel connecting Virginia Beach to Cape Charles . Known for both its beauty and bounty,

1010-776: A village location at the bay's mouth." The Chesapeake Bay is an estuary to the North Atlantic, lying between the Delmarva Peninsula to the east and the North American mainland to the west. It is the ria , or drowned valley, of the Susquehanna River , meaning that it was the alluvial plain where the river flowed when the sea level was lower. It is not a fjord , because the Laurentide Ice Sheet never reached as far south as

1111-605: Is a near threatened species that inhabits the wetlands. Larger fish such as Atlantic sturgeon , varieties of sharks, and stingrays visit the Chesapeake Bay. The waters of the Chesapeake Bay have been regarded as one of the most important nursery areas for sharks along the east coast. Megafaunas such as bull sharks , tiger sharks , scalloped hammerhead sharks , and basking sharks and manta rays are also known to visit. Smaller species of sharks and stingrays that are known to be regular to occasional residents in

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1212-479: Is a growing industry in the bay. Oyster aquaculture is passive in that the bay provides all the natural oyster food needed, making it an environmentally friendly practice in contrast to other kinds of fish farming. Oyster farms provide jobs as well as a natural effort for filtering excess nutrients from the water in an effort to reduce the effects of eutrophication pollution (too much algae). The Chesapeake Bay Program promotes oyster restoration projects to reduce

1313-414: Is a main feature for tourists who visit Maryland and Virginia each year. Fishing, crabbing, swimming, boating, kayaking, and sailing are extremely popular activities enjoyed on the waters of the Chesapeake Bay. As a result, tourism has a notable impact on Maryland's economy. One report suggested that Annapolis was an appealing spot for families, water sports and boating. Commentator Terry Smith spoke about

1414-415: Is approximately 20 miles (32 km) long; it has trestle bridges as well as two stretches of two-mile-long (3.2 km) tunnels that allow unimpeded shipping; the bridge is supported by four 5.25-acre (21,200 m ) man-made islands. The Chesapeake Bay Bridge – Tunnel was opened for two lanes in 1964 and four lanes in 1999. Tides in the Chesapeake Bay exhibit an interesting and unique behavior due to

1515-588: Is primarily separated from the Atlantic Ocean by the Delmarva Peninsula , including parts of the Eastern Shore of Maryland , the Eastern Shore of Virginia , and the state of Delaware . The mouth of the bay at its southern point is located between Cape Henry and Cape Charles . With its northern portion in Maryland and the southern part in Virginia , the Chesapeake Bay is a very important feature for

1616-487: 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

1717-614: 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

1818-713: 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

1919-828: 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,

2020-714: 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

2121-636: The Susquehanna River to its outlet in the Atlantic Ocean. It is 2.8 miles (4.5 km) wide at its narrowest (between Kent County's Plum Point near Newtown in the east and the Harford County western shore near Romney Creek) and 30 miles (48 km) at its widest (just south of the mouth of the Potomac River which divides Maryland from Virginia). Total shoreline including tributaries is 11,684 miles (18,804 km), circumnavigating

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2222-770: The "Battle of the Capes", Cape Charles and Cape Henry ) in 1781, during which the French fleet defeated the Royal Navy in the decisive naval battle of the American Revolutionary War . The French victory enabled General George Washington and his French allies under the Comte de Rochambeau to march down from New York and bottle up a British army under Lord Cornwallis from the North and South Carolinas at

2323-515: The Atlantic Ocean near Norfolk, Virginia , and the capes of Charles and Henry , there is a distinct semi-diurnal tide throughout the lunar month, with small amplitude modulations during spring (new/full moon) vs. neap (one/three quarter moon) tidal periods. The main forcing of the CBBT tides are typical, semi-diurnal ocean tides that the East Coast of the United States experiences. Baltimore, in

2424-831: The British landed on the west side of the Patuxent at Benedict, Maryland , the Chesapeake Flotilla was scuttled, and the British trekked overland to rout the U.S. Army at Bladensburg and burn the U.S. Capitol in August 1814. A few days later in a "pincer attack", they also sailed up the Potomac River to attack Fort Washington below the National Capital and raided the nearby port town of Alexandria, Virginia . There were so-called " Oyster Wars " in

2525-438: The CBBT site) this can be seen as a lowest intertidal range. Two interesting points that arise from comparing these two sites at opposite ends of the bay are their tidal characteristics - semi-diurnal tide for CBBT and mixed tide for Baltimore (due to resonance in the bay) - and the differences in amplitude (due to dissipation in the bay). The bay is well-known for its seafood, especially blue crabs , clams , and oysters . In

2626-464: The Chesapeake Bay include shad , cobia , croaker , and redfish , winter flounder , and summer flounder . Recently, non-native blue catfish have proliferated in tributaries like the James River and may be moving to other areas of the bay. A commercial fishery exists for menhaden , too oily for human consumption but instead used for bait, fish oil, and livestock feed. The Chesapeake Bay

2727-680: The Chesapeake Bay ;... I planned to spend my days boating, eating as many Chesapeake Bay blue crabs as possible and making a little study of Eastern Shore locals. For city folk like me, they're interesting, even exotic –the weather-beaten crabbers and oystermen called "watermen," gentlemen-farmers and sharecroppers, boat builders, antiques dealers – all of whom sound like Southerners with mouthfuls of marbles when they talk. — Susan Spano, Los Angeles Times , 2008 The Chesapeake Bay plays an extremely important role in Maryland, Virginia, and Pennsylvania's economies, in addition to

2828-509: The Governor William Preston Lane, Jr. Memorial Bridge) between the state capital of Annapolis, Maryland and Matapeake on the Eastern Shore , crossing Kent Island , was constructed 1949–1952. A second, parallel, span was added in 1973. The Chesapeake Bay Bridge–Tunnel , connecting Virginia's Eastern Shore with its mainland (at the metropolitan areas of Virginia Beach , Norfolk , Portsmouth , and Chesapeake ),

2929-651: The Third Haven monthly meeting included other meeting groups besides the one at Third Haven, including the other three original Talbot County meetings, two in Dorchester County and one in Caroline County . In 1797, the east and west wings of the building were removed; the entire structure was widened by 10 feet (3.0 m) along its length, giving it a slightly unbalanced look which has been commented upon. In 1880, an additional brick building

3030-623: 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

3131-427: The amount of nitrogen compounds entering the bay. The bay is famous for its rockfish, a regional name for striped bass . Once on the verge of extinction, rockfish have made a significant comeback because of legislative action that put a moratorium on rockfishing, which allowed the species to re-populate. Rockfish can now be fished in strictly controlled and limited quantities. Other popular recreational fisheries in

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3232-518: The area now known as South Hampton Roads in the U.S. state of Virginia. They occupied an area that is now the Norfolk, Portsmouth, Chesapeake, and Virginia Beach areas. In 2005, Algonquian linguist Blair Rudes "helped to dispel one of the area's most widely held beliefs: that 'Chesapeake' means something like 'great shellfish bay'. It does not, Rudes said. The name might have actually meant something like 'great water', or it might have just referred to

3333-460: The assertion that it was as far north as the Chesapeake; most place it in present-day Georgia 's Sapelo Island . In 1573, Pedro Menéndez de Márquez , the governor of Spanish Florida, conducted further exploration of the Chesapeake. In 1570, Spanish Jesuits established the short-lived Ajacan Mission on one of the Chesapeake tributaries in present-day Virginia. The arrival of English colonists under Sir Walter Raleigh and Humphrey Gilbert in

3434-406: 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

3535-441: The bay and its tributaries, which contain sea grasses that are part of the manatee's diet. Loggerhead turtles are known to visit the bay. The Chesapeake Bay is also home to a diverse flora, both land and aquatic. Common submerged aquatic vegetation includes eelgrass and widgeon grass . A report in 2011 suggested that information on underwater grasses would be released, because "submerged grasses provide food and habitat for

3636-555: The bay at some point during the year or live there year-round. There are over 300 species of fish and numerous shellfish and crab species. Some of these include the Atlantic menhaden , striped bass , American eel , eastern oyster , Atlantic horseshoe crab , and the blue crab . Birds include ospreys , great blue herons , bald eagles , and peregrine falcons , the last two of which were threatened by DDT ; their numbers plummeted but have risen in recent years. The piping plover

3737-678: The bay between 1607 and 1609, resulting in the publication in 1612 back in the British Isles of "A Map of Virginia" . Smith wrote in his journal: "Heaven and earth have never agreed better to frame a place for man's habitation." The Captain John Smith Chesapeake National Historic Trail , the first designated "all-water" National Historic Trail in the US, was established in 2006 by the National Park Service . The trail follows

3838-432: The bay has become "emptier", with fewer crabs, oysters and watermen (fishermen) since the mid-20th century. Nutrient pollution and urban runoff have been identified as major components of impaired water quality in the bay stressing ecosystems and compounding the decline of shellfish due to overharvesting . Restoration efforts that began in the 1990s have continued into the 21st century and show potential for growth of

3939-409: The bay include the smooth dogfish , spiny dogfish , cownose ray , and bonnethead . Bottlenose dolphins are known to live seasonally/yearly in the bay. There have been unconfirmed sightings of humpback whales in recent years. Endangered North Atlantic right whale and fin , and minke and sei whales have also been sighted within and in the vicinity of the bay. A male manatee visited

4040-453: The bay several times between 1994 and 2011, even though the area is north of the species' normal range. The manatee, recognizable due to distinct markings on its body, was nicknamed "Chessie" after a legendary sea monster that was allegedly sighted in the bay during the 20th century. The same manatee has been spotted as far north as Rhode Island , and was the first manatee known to travel so far north. Other manatees are occasionally seen in

4141-736: The bay to cool its reactor. The Chesapeake Bay forms a link in the Intracoastal Waterway , of the bays, sounds and inlets between the off-shore barrier islands and the coastal mainland along the Atlantic coast connecting the Chesapeake and Delaware Canal (linking the bay to the north and the Delaware River ) with the Albemarle and Chesapeake Canal (linking the bay, to the south, via the Elizabeth River , by

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4242-525: The bay's beauty: The water is glassy, smooth and gorgeous, his wake white against the deep blue. That's the problem with the Chesapeake. It's so damned beautiful. One account suggested how the Chesapeake attracts people: You see them everywhere on Maryland's Eastern Shore, the weekend sailors. They are unmistakable with their deep tans, their baggy shorts, their frayed polo shirts, their Top-Siders worn without socks. Some may not even own their own boats, much less win regattas, but they are inexorably drawn to

4343-417: The bay's dead zones were estimated to kill 75,000 tons of bottom-dwelling clams and worms each year, weakening the base of the estuary's food chain and robbing the blue crab in particular of a primary food source. Crabs are sometimes observed to amass on shore to escape pockets of oxygen-poor water, a behavior known as a "crab jubilee". Hypoxia results in part from large algal blooms , which are nourished by

4444-532: The bay, especially the Calvert County, Maryland , coastline, are lined by cliffs composed of deposits from receding waters millions of years ago. These cliffs, generally known as Calvert Cliffs , are famous for their fossils , especially fossilized shark teeth, which are commonly found washed up on the beaches next to the cliffs. Scientists' Cliffs is a beach community in Calvert County named for

4545-492: The bay. It is presumed that the Chesapeake Bay was once inhabited by Paleoindians 11,000 years ago. For thousands of years, Native American societies lived in villages of wooden longhouses close to water bodies where they fished and farmed the land. Agricultural products included beans, corn, tobacco, and squash. Villages often lasted between 10 and 20 years before being abandoned due to local resources such as firewood running out or soil depleting. To produce enough food, labor

4646-533: The bay. The salinity ranges from 1.87% to 3.6%. (3.6% is as salty as the ocean.) The climate of the area surrounding the bay is primarily humid subtropical , with hot, very humid summers and cold to mild winters. Only the area around the mouth of the Susquehanna River is continental in nature, and the mouth of the Susquehanna River and the Susquehanna flats often freeze in winter. It is rare for

4747-404: The bay. Water that was once clear for meters is now so turbid that a wader may lose sight of his feet while his knees are still dry. 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

4848-660: The cities of Norfolk and Portsmouth to the Albemarle Sound and Pamlico Sound in North Carolina and further to the Sea Islands of Georgia). A busy shipping channel (dredged by the U.S. Army Corps of Engineers since the 1850s) runs the length of the bay, is an important transit route for large vessels entering or leaving the Port of Baltimore , and further north through the Chesapeake and Delaware Canal to

4949-480: The course of each river. The bay's geology, its present form, and its very location were created by a bolide impact event at the end of the Eocene (about 35.5 million years ago), forming the Chesapeake Bay impact crater and much later the Susquehanna River valley. The bay was formed starting about 10,000 years ago when rising sea levels at the end of the last ice age flooded the Susquehanna River valley. Parts of

5050-571: The depth of the bay is 21 feet (6.4 m), including tributaries; over 24 percent of the bay is less than 6 ft (2 m) deep. Because the bay is an estuary, it has fresh water, salt water and brackish water. Brackish water has three salinity zones: oligohaline, mesohaline, and polyhaline . The freshwater zone runs from the mouth of the Susquehanna River to north Baltimore . The oligohaline zone has very little salt. Salinity varies from 0.5  ppt (parts per thousand) to 10 ppt, and freshwater species can survive there. The north end of

5151-403: The desire to create a retreat for scientists when the community was founded in 1935. Much of the bay is shallow. At the point where the Susquehanna River flows into the bay, the average depth is 30 feet (9 m), although this soon diminishes to an average of 10 feet (3 m) southeast of the city of Havre de Grace, Maryland , to about 35 feet (11 m) just north of Annapolis. On average,

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5252-499: The development of the skipjack (such as the Helen Virginia ), the state boat of Maryland, which is the only remaining working boat type in the United States still under sail power. Other characteristic bay-area workboats include sail-powered boats such as the log canoe , the pungy , the bugeye , and the motorized Chesapeake Bay deadrise , the state boat of Virginia. In addition to harvesting wild oysters, oyster farming

5353-430: 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

5454-441: 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

5555-697: 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

5656-857: 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

5757-446: The ecology and economy of those two states, as well as others surrounding within its watershed. More than 150 major rivers and streams flow into the bay's 64,299-square-mile (166,534 km ) drainage basin , which covers parts of six states ( New York , Pennsylvania , Delaware , Maryland, Virginia, and West Virginia ) and all of Washington, D.C. The bay is approximately 200 miles (320 km) long from its northern headwaters in

5858-912: The ecosystem. The nature-based recreation of wildlife, boating, and ecotourism are dependent on enforcement of the Clean Water Act (CWA), which regulates pollutant discharges and supports related pollution control programs. In 2006, "roughly eight million wildlife watchers spent $ 636 million, $ 960 million, and $ 1.4 billion in Maryland, Virginia, and Pennsylvania" according to the Chesapeake Bay Foundation . In colonial times, simple cooking techniques were used to create one pot meals like ham and potato casserole , clam chowder, or stews with common ingredients like oysters, chicken or venison. When John Smith landed in Chesapeake in 1608, he wrote: "The fish were so thick, we attempted to catch them with frying pans". Common regional ingredients in

5959-567: The entirety of the bay in about 3.3 days; by 1988 this time had increased to 325 days. The harvest's gross value decreased 88% from 1982 to 2007. One report suggested the bay had fewer oysters in 2008 than 25 years earlier. The primary problem is overharvesting . Lax government regulations allow anyone with a license to remove oysters from state-owned beds, and although limits are set, they are not strongly enforced. The overharvesting of oysters has made it difficult for them to reproduce, which requires close proximity to one another. A second cause for

6060-553: The geometry of the bay permits for a resonant period of 1.46 days. A good example of how the different Chesapeake Bay sites experience different tides can be seen in the tidal predictions published by the National Oceanographic and Atmospheric Administration (NOAA) (see figure at right). At the Chesapeake Bay Bridge–Tunnel (CBBT) site, which lies at the southernmost point of the bay where it meets

6161-583: 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 ,

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6262-435: 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

6363-422: 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

6464-446: The habitat for much of the bay's animal life. Beds of eelgrass , the dominant variety in the southern Chesapeake Bay, have shrunk by more than half there since the early 1970s. Overharvesting, pollution, sedimentation and disease have turned much of the bay's bottom into a muddy wasteland. The principal sources of nutrient pollution in the bay are surface runoff from farms, as well as runoff from urban and suburban areas. About half of

6565-458: The help of aquarium owners, who often dump the contents of their aquariums into nearby lakes and streams. It is highly invasive and has the potential to flourish in the low-salinity tidal waters of the Chesapeake Bay. Dense stands of Brazilian waterweed can restrict water movement, trap sediment and affect water quality. Various local K-12 schools in the Maryland and Virginia region often have programs that cultivate native bay grasses and plant them in

6666-417: 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

6767-403: The late 16th century to found a colony, later settled at Roanoke Island (off the present-day coast of North Carolina ) for the Virginia Company , marked the first time that the English approached the gates to the Chesapeake Bay between the capes of Cape Charles and Cape Henry . Three decades later, in 1607, Europeans again entered the bay. Captain John Smith of England explored and mapped

6868-434: The late 19th and early 20th centuries. Until the mid-20th century, oyster harvesting rivaled the crab industry among Chesapeake watermen, a dwindling breed whose skipjacks and other workboats were supplanted by recreational craft in the latter part of the century. In the 1960s, the Calvert Cliffs Nuclear Power Plant on the historic Calvert Cliffs in Calvert County on the Western Shore of Maryland began using water from

6969-488: The leadership of a central chief. In 1524, Italian explorer Giovanni da Verrazzano , (1485–1528), in service of the French crown , (famous for sailing through and thereafter naming the entrance to New York Bay as the " Verrazzano Narrows ", including now in the 20th century, a suspension bridge also named for him ) sailed past the Chesapeake, but did not enter the bay. Spanish explorer Lucas Vásquez de Ayllón sent an expedition out from Hispaniola in 1525 that reached

7070-450: The local cuisine of Chesapeake included terrapins , smoked hams, blue crab, shellfish, local fish, game meats and various species of waterfowl. Blue crab continues to be an especially popular regional specialty. In the 1970s, the Chesapeake Bay was found to contain one of the planet's first identified marine dead zones , where waters were so depleted of oxygen that they were unable to support life, resulting in massive fish kills . In 2010

7171-424: The marine ecosystem. The word Chesepiooc is an Algonquian word referring to a village 'at a big river'. It is the seventh-oldest surviving English placename in the United States, first applied as Chesepiook by explorers heading north from the Roanoke Colony into a Chesapeake tributary in 1585 or 1586. The name may also refer to the Chesapeake people or the Chesepian, a Native American tribe who inhabited

7272-472: The middle of the 20th century, the bay supported 9,000 full-time watermen, according to one account. Today, the body of water is less productive than it used to be because of runoff from urban areas (mostly on the Western Shore) and farms (especially on the Eastern Shore and in the Susquehanna River watershed), over-harvesting, and invasion of foreign species . The plentiful oyster harvests led to

7373-514: 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

7474-522: The mouths of the Chesapeake and Delaware Bays . It may have been the first European expedition to explore parts of the Chesapeake Bay, which the Spaniards called "Bahía de Santa María" ("Bay of St. Mary") or "Bahía de Madre de Dios."("Bay of the Mother of God") De Ayllón established a short-lived Spanish mission settlement, San Miguel de Gualdape , in 1526 along the Atlantic coast . Many scholars doubt

7575-414: The native oyster population. The health of the Chesapeake Bay improved in 2015, marking three years of gains over a four-year period. Slight improvements in water quality were observed in 2021, compared to indicators measured in 2020. The bay is experiencing other environmental concerns, including climate change which is causing sea level rise that erodes coastal areas and infrastructure and changes to

7676-535: The nature of the topography (both horizontal and vertical shape), wind-driven circulation, and how the bay interacts with oceanic tides. Research into the peculiar behavior of tides both at the northern and southern extents of the bay began in the late 1970s. One study noted sea level fluctuations at periods of 5 days, driven by sea level changes at the bay's mouth on the Atlantic coast and local lateral winds, and 2.5 days, caused by resonant oscillations driven by local longitudinal winds, while another study later found that

7777-407: The northern portion of the bay, experiences a noticeable modulation to form its mixed tidal nature during spring vs. neap tides. Spring tides, when the sun-earth-moon system forms a line, cause the largest tidal amplitudes during lunar monthly tidal variations. In contrast, neap tides, when the sun-earth-moon system forms a right angle, are muted, and in a semi-diurnal tidal system (such as that seen at

7878-409: The northernmost point on the bay. North of Baltimore , the western shore borders the hilly Piedmont region of Maryland; south of the city the bay lies within the state's low-lying coastal plain , with sedimentary cliffs to the west, and flat islands, winding creeks and marshes to the east. The large rivers entering the bay from the west have broad mouths and are extensions of the main ria for miles up

7979-536: The nutrient pollutant loads in the bay are generated by manure and poultry litter. Extensive use of lawn fertilizers and air pollution from motor vehicles and power plants are also significant nutrient sources. One particularly harmful source of toxicity is Pfiesteria piscicida , which can affect both fish and humans. Pfiesteria caused a small regional panic in the late 1990s when a series of large blooms started killing large numbers of fish while giving swimmers mysterious rashes; nutrient runoff from chicken farms

8080-411: The nutrients phosphorus and nitrogen . The algae prevents sunlight from reaching the bottom of the bay while alive and deoxygenates the bay's water when it dies and rots. Soil erosion and runoff of sediment into the bay, exacerbated by devegetation, construction and the prevalence of pavement in urban and suburban areas, also block vital sunlight. The resulting loss of aquatic vegetation has depleted

8181-676: The oligohaline zone is north Baltimore and the south end is the Chesapeake Bay Bridge. The mesohaline zone has a medium amount of salt and runs from the Bay Bridge to the mouth of the Rappahannock River . Salinity there ranges from 1.07% to 1.8%. The polyhaline zone is the saltiest zone, and some of the water can be as salty as sea water. It runs from the mouth of the Rappahannock River to the mouth of

8282-403: The oyster depletion is that the drastic increase in human population caused a sharp increase in pollution flowing into the bay. The bay's oyster industry has also suffered from two diseases: MSX and Dermo . The depletion of oysters has had a particularly harmful effect on the quality of the bay. Oysters serve as natural water filters, and their decline has further reduced the water quality of

8383-517: The ports of Wilmington and Philadelphia on the Delaware River . During the later half of the 19th century and the first half of the 20th century, the bay was plied by passenger steamships and packet boat lines connecting the various cities on it, notably the Baltimore Steam Packet Company ("Old Bay Line"). In the later 20th century, a series of road crossings were built. One, the Chesapeake Bay Bridge (also known as

8484-418: 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

8585-631: 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

8686-461: 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

8787-531: The route of Smith's historic 17th-century voyage. Because of economic hardships and civil strife in the "Mother Land", there was a mass migration of southern English Cavaliers and their servants to the Chesapeake Bay region between 1640 and 1675, to both of the new colonies of the Province of Virginia and the Province of Maryland . The Chesapeake Bay was the site of the Battle of the Chesapeake (also known as

8888-562: The runoff of residential, farm and industrial waste throughout the watershed. A 2010 report criticized Amish farmers in Pennsylvania for raising cows with inadequate controls on the manure that they generate. Farms in Lancaster County, Pennsylvania generate large quantities of manure that washes into tributaries of the bay. The pollution entering the bay has multiple components that contribute to algal blooms, principally

8989-623: The siege of Battle of Yorktown in Yorktown, Virginia . Their marching route from Newport, Rhode Island through Connecticut, New York State, Pennsylvania, New Jersey and Delaware to the "Head of Elk" by the Susquehanna River along the shores and also partially sailing down the bay to Virginia . It is also the subject of a designated National Historic Trail as the Washington–Rochambeau Revolutionary Route . The bay would again see conflict during War of 1812 . During

9090-418: 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

9191-470: The surface of the bay to freeze in winter, something that happened most recently in the winter of 1976–77. The Chesapeake Bay is the end point of over 150 rivers and streams. The largest rivers flowing directly into the bay, in order of discharge, are: For more information on Chesapeake Bay rivers, see the List of Chesapeake Bay rivers . The Chesapeake Bay is home to numerous fauna that either migrate to

9292-415: 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

9393-477: 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

9494-524: The town of Easton , and is a common destination for visitors to the Eastern Shore. 38°45′59″N 76°4′37″W  /  38.76639°N 76.07694°W  / 38.76639; -76.07694 Chesapeake Bay The Chesapeake Bay ( / ˈ tʃ ɛ s ə p iː k / CHESS -ə-peek ) is the largest estuary in the United States. The bay is located in the Mid-Atlantic region and

9595-610: 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

9696-448: The year of 1813, from their base on Tangier Island , British naval forces under the command of Admiral George Cockburn raided several towns on the shores of the Chesapeake, treating the bay as if it were a "British Lake". The Chesapeake Bay Flotilla , a fleet of shallow-draft armed barges under the command of U.S. Navy Commodore Joshua Barney , was assembled to stall British shore raids and attacks. After months of harassment by Barney,

9797-509: Was birthed from a visit to Talbot County by George Fox , and it was also the first meeting to be moved away from the home of one of the Friends (Wenlock Christison) into an actual meeting house. It was named Betty's Cove, constructed at an indeterminate date. As the Quaker population of Talbot County continued to grow, more meeting houses were built to house three additional meetings. In 1681,

9898-409: Was blamed for the growth. While the bay's salinity is ideal for oysters and the oyster fishery was at one time the bay's most commercially viable, the population has in the last fifty years been devastated. Maryland once had roughly 200,000 acres (810 km ) of oyster reefs. In 2008 there were about 36,000 acres (150 km ). It has been estimated that in pre-colonial times, oysters could filter

9999-433: Was constructed for use in the winter months. Unlike the original meeting house, it has electricity, heating, and plumbing. The Great Meetinghouse is the only Third Haven Monthly Meeting to survive into the third millennium, and it still maintains a healthy congregation. Worship meetings are held every Sunday morning and Wednesday evening. The building itself has attracted a great deal of interest by historians and locals to

10100-576: Was divided with men hunting while the women supervised the village's farming. All village members took part in the harvesting of fish and shellfish from the local bodies of water. As time went on, communities around the Chesapeake Bay formed confederations such as the Powhatan , the Piscataway , and the Nanticoke . Each of these confederations consisted of a collection of smaller tribes falling under

10201-626: Was finished soon afterward. In 1693, the congregation of Betty's Cove merged with Third Haven. As part of the tradition of Maryland Quakerism, two yearly meetings of all Maryland Quakers would take place—one in autumn on the East Shore, and one in spring on the West Shore. The autumnal meeting took place at the Great Meetinghouse on Third Haven, while the vernal meeting took place at West River near Annapolis . In time,

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