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Safe Harbor Dam
The Safe Harbor Dam (also Safe Harbor Hydroelectric Station) is a concrete gravity dam, with an associated hydroelectric power station, on the lower Susquehanna River. It is the most northerly and last of three Great Depression-era public works#Overview, public electrification, electrification projects' hydroelectric dams, and was constructed between April 1, 1930 and December 7, 1931. It created a long and relatively shallow lake, known as Lake Clarke, along the upper stretch of the Conejohela Valley. The creation of the lake shrank the upper Conejohela Flats in size. Base terrains The mixed marshy terrain of the Conejohela Valley contained rapids and small waterfalls, wetlands, and thick woods along both sides of the river within a ten-year floodplain which saw annual inundations all the way down into Maryland at the headwaters of Chesapeake Bay, and experienced catastrophic floods regularly (the meaning of a ten-year floodplain). The varied terrain created many interface zones b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Susquehanna River
The Susquehanna River (; Lenape: Siskëwahane) is a major river located in the Mid-Atlantic region of the United States, overlapping between the lower Northeast and the Upland South. At long, it is the longest river on the East Coast of the United States. By watershed area, it is the 16th-largest river in the United States,Susquehanna River Trail Pennsylvania Fish and Boat Commission, accessed March 25, 2010.Susquehanna River , Green Works Radio, accessed March 25, 2010. and also the longest river in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Floodplain
A floodplain or flood plain or bottomlands is an area of land adjacent to a river which stretches from the banks of its channel to the base of the enclosing valley walls, and which experiences flooding during periods of high discharge.Goudie, A. S., 2004, ''Encyclopedia of Geomorphology'', vol. 1. Routledge, New York. The soils usually consist of clays, silts, sands, and gravels deposited during floods. Because the regular flooding of floodplains can deposit nutrients and water, floodplains frequently have high soil fertility; some important agricultural regions, such as the Mississippi river basin and the Nile, rely heavily on the flood plains. Agricultural regions as well as urban areas have developed near or on floodplains to take advantage of the rich soil and fresh water. However, the risk of flooding has led to increasing efforts to control flooding. Formation Most floodplains are formed by deposition on the inside of river meanders and by overbank flow. Whereve ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Single-phase Electric Power
In electrical engineering, single-phase electric power (abbreviated 1φ) is the distribution of alternating current electric power using a system in which all the voltages of the supply vary in unison. Single-phase distribution is used when loads are mostly lighting and heating, with few large electric motors. A single-phase supply connected to an alternating current electric motor does not produce a rotating magnetic field; single-phase motors need additional circuits for starting (capacitor start motor), and such motors are uncommon above 10 kW in rating. Because the voltage of a single phase system reaches a peak value twice in each cycle, the instantaneous power is not constant. Standard frequencies of single-phase power systems are either 50 or 60 Hz. Special single-phase traction power networks may operate at 16.67 Hz or other frequencies to power electric railways. History Single phase power transmission took many years to develop. The earliest developments ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Single-phase Generator
Single-phase generator (also known as single-phase alternator) is an alternating current electrical generator that produces a single, continuously alternating voltage. Single-phase generators can be used to generate power in single-phase electric power systems. However, polyphase generators are generally used to deliver power in three-phase distribution system and the current is converted to single-phase near the single-phase loads instead. Therefore, single-phase generators are found in applications that are most often used when the loads being driven are relatively light, and not connected to a three-phase distribution, for instance, portable engine-generators. Larger single-phase generators are also used in special applications such as single-phase traction power for railway electrification systems. Designs Revolving armature The design of revolving armature generators is to have the armature part on a rotor and the magnetic field part on stator. A basic design, called elem ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kaplan Turbine
The Kaplan turbine is a propeller-type water turbine which has adjustable blades. It was developed in 1913 by Austrian professor Viktor Kaplan, who combined automatically adjusted propeller blades with automatically adjusted wicket gates to achieve efficiency over a wide range of flow and water level. The Kaplan turbine was an evolution of the Francis turbine. Its invention allowed efficient power production in low-head applications which was not possible with Francis turbines. The head ranges from and the output ranges from 5 to 200 MW. Runner diameters are between . Turbines rotate at a constant rate, which varies from facility to facility. That rate ranges from as low as 54.5 rpm (Albeni Falls Dam) to 450 rpm. Kaplan turbines are now widely used throughout the world in high-flow, low-head power production. Development Viktor Kaplan, living in Brünn, Austria-Hungary (now Brno, Czechia), obtained his first patent for an adjustable blade propeller turbine in 1912. But t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brookfield Renewable
Brookfield Renewable Partners L.P. is a publicly traded limited partnership that owns and operates renewable power assets, with corporate headquarters in Toronto, Ontario, Canada. It is 60% owned by Brookfield Asset Management. As of the end of 2017, Brookfield Renewable owned over 200 hydroelectric plants, 100 wind farms, over 550 solar facilities, and four storage facilities, with approximately 16,400 MW of installed capacity. Brookfield Asset Management claims to have "more than 100 years of experience as an owner, operator and developer of hydroelectric power facilities." It was founded in the 1890s in Brazil, where the company installed the first electrical lights and tramways in São Paulo and Rio de Janeiro. Corporate structure The company was established as Brookfield Renewable Energy Partners in 2011, when Brookfield Asset Management combined the hydroelectric stations and wind farms of the Brookfield Renewable Power Fund with those of Brookfield Renewable Power Inc. Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Game Fish
Game fish, sport fish or quarry refer to popular fish pursued by recreational anglers, and can be freshwater or saltwater fish. Game fish can be eaten after being caught, or released after capture. Some game fish are also targeted commercially, particularly salmon and tuna. Specimens of game fish whose measurements (body length and weight) are a lot above the species' average are sometimes known as trophy fish. Examples The species of fish prized by anglers varies with geography and tradition. Some fish are sought for their value as food, while others are pursued for their fighting abilities, or for the difficulty of successfully enticing the fish to bite the hook. * Big-game fish are blue water saltwater bony fish such as tuna, tarpon, grouper and billfish (sailfish, marlin and swordfish). Occasionally other predatory fishes such as sharks, barracuda and dolphinfish are also pursued. * In North America, many anglers fish for common snook, redfish, salmon/trout, bass, no ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Washington Boro, Pennsylvania
Washington Boro is an unincorporated community and census-designated place (CDP) in Manor Township, Lancaster County, Pennsylvania, United States, along the Susquehanna River. The ZIP code is 17582. It is served by the Penn Manor School District and is the terminus of Pennsylvania Route 441 and Pennsylvania Route 999. As of the 2010 census the population was 729. History The French-Canadian fur trader Martin Chartier and his son Peter Chartier established a trading post near this area in 1718. A monument was erected on the spot in 1925 by the Pennsylvania Historical Commission and the Lancaster County Historical Society. Also called the "Borough of Washington" or "Washingtonboro" in the past, the small community was settled in 1810 and incorporated in 1827. It was a center of river trade and river jobs, as it is located near the site of the first colonial era animal-powered ferry across the lower Susquehanna River—Wright's Ferry between present-day Columbia, Pennsylvania, Co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Conestoga River
The Conestoga River, also referred to as Conestoga Creek, is a U.S. Geological Survey. National Hydrography Dataset high-resolution flowline dataThe National Map, accessed August 8, 2011 tributary of the Susquehanna River flowing through the center of Lancaster County, Pennsylvania, United States. Geography Its headwaters rise mostly in southern Berks County and northeastern Lancaster County, in an area known as "Bortz's Swamp" or "Penngall Field" (a small area rises in Chester County). The East Branch and West Branch of the Conestoga join to form the main river just north of Morgantown, and the stream flows from northeast to southwest for more than , passing close to the center of Lancaster and ending at Safe Harbor along the Susquehanna River, approximately north of the Pennsylvania-Maryland state line. The principal tributaries of the Conestoga River are Cocalico Creek, Mill Creek, and Little Conestoga Creek; they drain into the Conestoga River watershed in the order ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wright's Ferry
Wright's Ferry was a Pennsylvania Colony settlement established by John Wright in 1726, that grew up around the site of an important Inn and Pub anchoring the eastern end of a popular animal powered ferry (1730–1901) and now a historic part of Columbia, Pennsylvania. The complex was important in settling the lands west of the cranky Susquehanna, for without resorting to water craft, the ferry was the first (and for many years, ''the only'') means of crossing the wide watercourse of the relatively shallow Susquehanna River for settlers with a cargo in the southern part of Pennsylvania—which is very wide from Middletown, Dauphin County southerly past Wright's Ferry and grows steadily wider as it nears its mouth at the Chesapeake Bay, and whose banks are steep enough to prevent easy cargo handling from small boats. As Pennsylvanian settlers started to move into the area, ownership conflicts arose between the English colonies of Maryland and Pennsylvania due to sloppy grant ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Province Of Maryland
The Province of Maryland was an English and later British colony in North America that existed from 1632 until 1776, when it joined the other twelve of the Thirteen Colonies in rebellion against Great Britain and became the U.S. state of Maryland. Its first settlement and capital was St. Mary's City, in the southern end of St. Mary's County, which is a peninsula in the Chesapeake Bay and is also bordered by four tidal rivers. The province began as a proprietary colony of the English Lord Baltimore, who wished to create a haven for English Catholics in the New World at the time of the European wars of religion. Although Maryland was an early pioneer of religious toleration in the English colonies, religious strife among Anglicans, Puritans, Catholics, and Quakers was common in the early years, and Puritan rebels briefly seized control of the province. In 1689, the year following the Glorious Revolution, John Coode led a rebellion that removed Lord Baltimore, a Catholic, from pow ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
