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Big Sioux River
The Big Sioux River
Big Sioux River
is a tributary of the Missouri River, 419 miles (674 km) long,[1] in eastern South Dakota
South Dakota
and northwestern Iowa in the United States.[2] The United States
United States
Board on Geographic Names settled on "Big Sioux River" as the stream's name in 1931.[3] The river was named after the Lakota people
Lakota people
(Sioux Indians).[4] The Big Sioux River
Big Sioux River
rises in Roberts County, South Dakota[3] on a low plateau known as the Coteau des Prairies
Coteau des Prairies
and flows generally southwardly through Grant, Codington, Hamlin, Brookings, Moody, and Minnehaha counties, past the communities of Watertown, Castlewood, Bruce, Flandreau, Egan, Trent, Dell Rapids, and Baltic to Sioux Falls, where it passes over a waterfall in Falls Park, which gives that city its name
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Floodwall
A flood wall (or floodwall) is a primarily vertical artificial barrier designed to temporarily contain the waters of a river or other waterway which may rise to unusual levels during seasonal or extreme weather events. Flood
Flood
walls are mainly used on locations where space is scarce, such as cities or where building levees or dikes (dykes) would interfere with other interests, such as existing buildings, historical architecture or commercial use of embankments. Flood
Flood
walls are nowadays mainly constructed from pre-fabricated concrete elements. Flood
Flood
walls often have floodgates which are large openings to provide passage except during periods of flooding, when they are closed
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Moody County, South Dakota
Moody County is a county located in the U.S. state of South Dakota in the United States. The population was 6,486 at the 2010 census.[1] Its county seat is Flandreau.[2] The county is named for Gideon C. Moody.[3]Contents1 Geography1.1 Major highways 1.2 Adjacent counties2 Demographics2.1 2000 census 2.2 2010 census3 Communities3.1 Cities 3.2 Towns 3.3 Unincorporated community 3.4 Townships4 Politics 5 See also 6 ReferencesGeography[edit] According to the U.S
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Lincoln County, South Dakota
Lincoln County is a county located in the U.S. state of South Dakota. As of the 2010 census, the population was 44,828,[2] making it the third-most populated county in the state. Its county seat is Canton.[3] The county was named after Abraham Lincoln, 16th President of the United States.[4] Lincoln County is included in the Sioux Falls, SD, Metropolitan Statistical Area. It is one of the top 10 fastest-growing counties in the United States in terms of rate of population increase, rate of housing unit increase, and many other factors. This is due to the southward growth of Sioux Falls, and the expansion of its suburbs.Contents1 Geography1.1 Lakes 1.2 Protected areas 1.3 Major highways 1.4 Adjacent counties2 Demographics2.1 2000 census 2.2 2010 census3 Communities3.1 Cities 3.2 Towns 3.3 Census-designated place 3.4 Townships4 Politics 5 See also 6 References 7 External linksGeography[edit] According to the U.S
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Escherichia Coli
Bacillus coli
Bacillus coli
communis Escherich 1885 Escherichia
Escherichia
coli (/ˌɛʃɪˈrɪkiə ˈkoʊlaɪ/;[1] also known as E. coli) is a Gram-negative, facultatively anaerobic, rod-shaped, coliform bacterium of the genus Escherichia
Escherichia
that is commonly found in the lower intestine of warm-blooded organisms (endotherms).[2][3] Most E. coli strains are harmless, but some serotypes can cause serious food poisoning in their hosts, and are occasionally responsible for product recalls due to food contamination.[4][5] The harmless strains are part of the normal flora of the gut, and can benefit their hosts by producing vitamin K2,[6] and preventing colonization of the intestine with pathogenic bacteria, having a symbiotic relationship.[7][8] E. coli is expelled into the environment within fecal matter
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Fecal Coliform
A fecal coliform (British: faecal coliform) is a facultatively anaerobic, rod-shaped, gram-negative, non-sporulating bacterium. Coliform bacteria
Coliform bacteria
generally originate in the intestines of warm-blooded animals. Fecal coliforms are capable of growth in the presence of bile salts or similar surface agents, are oxidase negative, and produce acid and gas from lactose within 48 hours at 44 ± 0.5°C.[1] The term "thermotolerant coliform" is more correct and is gaining acceptance over "faecal coliform".[2] Coliform bacteria
Coliform bacteria
include genera that originate in feces (e.g. Escherichia) as well as genera not of fecal origin (e.g. Enterobacter, Klebsiella, Citrobacter). The assay is intended to be an indicator of fecal contamination; more specifically of E. coli which is an indicator microorganism for other pathogens that may be present in feces
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Waterfall
A waterfall is a place where water flows over a vertical drop or a series of steep drops in the course of a stream or river. Waterfalls also occur where meltwater drops over the edge of a tabular iceberg or ice shelf.Contents1 Formation 2 Researchers 3 Types 4 Examples 5 Image gallery 6 See also 7 ReferencesFormation[edit]Formation of a waterfallWaterfalls are commonly formed in the upper course of a river in steep mountains.[1] Because of their landscape position, many waterfalls occur over bedrock fed by little contributing area, so may be ephemeral and flow only during rainstorms or significant snowmelt. The further downstream, the more perennial a waterfall can be. Waterfalls can have a wide range of widths and depths, and this diversity is part of what makes them such a charismatic and interesting natural phenomenon
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Suspended Solids
Suspended solids refers to small solid particles which remain in suspension in water as a colloid or due to the motion of the water.[1] It is used as one indicator of water quality. It is sometimes abbreviated SS, but is not to be confused with settleable solids, also abbreviated SS, which contribute to the blocking of sewer pipes.Contents1 Explanation 2 Removal 3 Effectiveness of filtering 4 See also 5 ReferencesExplanation[edit] Suspended solids are important as pollutants and pathogens are carried on the surface of particles. The smaller the particle size, the greater the total surface area per unit mass of particle in grams, and so the higher the pollutant load that is likely to be carried. Removal[edit] Removal of suspended solids is generally achieved through the use of sedimentation and/or water filters (usually at a municipal level)
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Plymouth County, Iowa
Coordinates: 42°44′18″N 96°13′13″W / 42.73833°N 96.22028°W / 42.73833; -96.22028Plymouth County, IowaPlymouth County CourthouseLocation in the U.S. state
U.S. state
of IowaIowa's location in the U.S.Founded 1851Seat Le MarsLargest city Le MarsArea • Total 864 sq mi (2,238 km2) • Land 863 sq mi (2,235 km2) • Water 0.8 sq mi (2 km2), 0.1%Population • (2010) 24,986 • Density 29/sq mi (11/km2)Congressional district 4thTime zone Central: UTC−6/−5Website www.co.plymouth.ia.usPlymouth County is a county located in the U.S. state
U.S. state
of Iowa
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Akron, Iowa
Akron is a city in Plymouth County, Iowa, United States. The population was 1,486 at the 2010 census.Contents1 Geography 2 Demographics2.1 2010 census 2.2 2000 census3 Education 4 Notable people 5 References 6 External linksGeography[edit] According to the United States Census Bureau, the city has a total area of 1.22 square miles (3.16 km2), all of it land.[1] Akron is considered the northern gateway to the Loess Hills and the Loess Hills Scenic Byway. These unique hills made up of windblown soil stretch southward from Akron toward St. Joseph, Missouri. Demographics[edit]Historical populationsYear Pop. ±%1890 494 —    1900 1,029 +108.3%1910 1,130 +9.8%1920 1,324 +17.2%1930 1,304 −1.5%1940 1,314 +0.8%1950 1,251 −4.8%1960 1,351 +8.0%1970 1,324 −2.0%1980 1,517 +14.6%1990 1,450 −4.4%2000 1,489 +2.7%2010 1,486 −0.2%2016 1,465 −1.4%Source:"American FactFinder"
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Clean Water Act
EI duPont de Nemours & Co. v. Train, 430 U.S. 112 (1977) EPA v. Nat'l Crushed Stone Assn., 449 U.S. 64 (1980)The Clean Water Act
Clean Water Act
(CWA) is the primary federal law in the United States governing water pollution. Its objective is to restore and maintain the chemical, physical, and biological integrity of the nation's waters by preventing point and nonpoint pollution sources, providing assistance to publicly owned treatment works for the improvement of wastewater treatment, and maintaining the integrity of wetlands. It is one of the United States' first and most influential modern environmental laws. As with many other major U.S. federal environmental statutes, it is administered by the U.S. Environmental Protection Agency (EPA), in coordination with state governments. Its implementing regulations are codified at 40 C.F.R
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100-year Flood
A one-hundred-year flood is a flood event that has a 1% probability of occurring in any given year. The 100-year flood
100-year flood
is also referred to as the 1% flood, since its annual exceedance probability is 1%.[1] For river systems, the 100-year flood
100-year flood
is generally expressed as a flowrate. Based on the expected 100-year flood
100-year flood
flow rate, the flood water level can be mapped as an area of inundation. The resulting floodplain map is referred to as the 100-year floodplain
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Lyon County, Iowa
Centre: Parc de la Tête d'Or, Confluence district and the Vieux Lyon. Bottom: Pont Lafayette, Part-Dieu district with the Place Bellecour
Place Bellecour
in foreground during Festival of Lights.FlagCoat of armsMotto(s): Avant, avant, Lion le melhor. (Old Franco-Provençal: Forward, forward, Lyon
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River Source
The source or headwaters of a river or stream is the furthest place in that river or stream from its estuary or confluence with another river, as measured along the course of the river.Contents1 Definition 2 Characteristics of sources2.1 Example3 Related usages 4 See also 5 ReferencesDefinition[edit]The marker indicating the source of the Po River, near Crissolo. "Here is born the Po"The United States Geological Survey
United States Geological Survey
(USGS) states that a river's "length may be considered to be the distance from the mouth to the most distant headwater source (irrespective of stream name), or from the mouth to the headwaters of the stream commonly known as the source stream". As an example of the second definition above, the USGS at times considers the Missouri River
River
as a tributary of the Mississippi River
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Brookings County, South Dakota
Brookings County is a county located in the U.S. state of South Dakota. As of the 2010 census, the population was 31,965,[1] making it the fifth-most populous county in South Dakota. Its county seat is Brookings.[2] The county was created in 1862 and organized in 1871.[3] Brookings County comprises the Brookings, SD Micropolitan Statistical Area.Contents1 History 2 Geography2.1 Lakes 2.2 Adjacent counties3 Demographics3.1 2000 census 3.2 2010 census4 Transportation4.1 Major highways 4.2 Airports5 Communities5.1 Cities 5.2 Towns 5.3 Census-designated place 5.4 Unincorporated communities 5.5 Townships6 Politics 7 See also 8 References 9 External linksHistory[edit] The county was founded July 3, 1871, and was named after Wilmot Wood Brookings (1830-1905), a politician and pioneer of southeastern South Dakota. Medary was the first county seat for eight years from 1871-1879 Geography[edit]Soils of Brookings CountyAccording to the U.S
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Hamlin County, South Dakota
Hamlin County is a county located in the U.S. state of South Dakota. As of the 2010 census, the population was 5,903.[1] Its county seat is Hayti.[2] The county was created in 1873 and organized in 1878.[3] It was named in honor of Hannibal Hamlin, Lincoln's first vice-president.[4]Contents1 Geography1.1 Major highways 1.2 Adjacent counties2 Demographics2.1 2000 census 2.2 2010 census3 Communities3.1 Cities 3.2 Towns 3.3 Census-designated place 3.4 Unincorporated communities 3.5 Townships4 Politics 5 See also 6 ReferencesGeography[edit]Soils of Hamlin CountyAccording to the U.S. Census Bureau, the county has a total area of 538 square miles (1,390 km2), of which 507 square miles (1,310 km2) is land and 31 square miles (80 km2) (5.7%) is water.[5] Major highways[edit] Interstate 29 U.S
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