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47-622: The Mississippi Valley Conservation Authority (MVCA) (formerly Mississippi Valley Conservation (MVC) ) is a conservation authority in the province of Ontario . It is headquartered in Carleton Place, Ontario and serves a 4450 km watershed located across eleven municipalities. The organization is responsible for both the Mississippi River watershed and the Carp River watershed. This article about an environmental organization

94-495: A conservation authority, similar to a building permit, to do work such as constructing buildings or placing fill in these areas. These regulations were put in place after the devastating impacts of Hurricane Hazel in 1954. Conservation authorities also do flood forecasting and warning, flood and erosion control, ice management and drought programs, and contribute to municipal land use planning. Conservation authorities may have programs to protect local ecosystems and contribute to

141-507: A pioneer of the study of karst in Slovenia and a fellow of the Royal Society , London, introduced the word karst to European scholars in 1689 to describe the phenomenon of underground flows of rivers in his account of Lake Cerknica . Jovan Cvijić greatly advanced the knowledge of karst regions to the point where he became known as the "father of karst geomorphology". Primarily discussing

188-562: A proper noun, the Slovene form Grast was first attested in 1177. Ultimately, the word is of Mediterranean origin. It has also been suggested that the word may derive from the Proto-Indo-European root karra- 'rock'. The name may also be connected to the oronym Kar(u)sádios oros cited by Ptolemy , and perhaps also to Latin Carusardius . Johann Weikhard von Valvasor ,

235-463: A provincial template regulation. Under these regulations, conservation authorities regulate development and other activities in and near natural hazard areas such as shorelines, floodplains, unstable slopes, wetlands, and other hazardous lands, such as karst topography and Leda clay . Development is prohibited in areas designated by the regulation unless permission is granted by the conservation authority. Landowners or developers may need permits from

282-401: A sport than a science and so the underground karst caves and their associated watercourses were, from a scientific perspective, understudied. Karst is most strongly developed in dense carbonate rock , such as limestone, that is thinly bedded and highly fractured . Karst is not typically well developed in chalk , because chalk is highly porous rather than dense, so the flow of groundwater

329-519: A well in a fracture trace or intersection of fracture traces increases the likelihood to encounter good water production. Voids in karst aquifers can be large enough to cause destructive collapse or subsidence of the ground surface that can initiate a catastrophic release of contaminants. Groundwater flow rate in karst aquifers is much more rapid than in porous aquifers. For example, in the Barton Springs Edwards aquifer, dye traces measured

376-632: Is a stub . You can help Misplaced Pages by expanding it . This article about an organization in Canada is a stub . You can help Misplaced Pages by expanding it . Conservation authority (Ontario, Canada) The 1946 Conservation Authorities Act provides the means by which municipalities within a common watershed can petition the Province of Ontario to form a conservation authority for that watershed to undertake programs of natural resource management. Conservation authorities are established as corporate bodies under

423-493: Is a UNESCO World Heritage Site. Many karst-related terms derive from South Slavic languages , entering scientific vocabulary through early research in the Western Balkan Dinaric Alpine karst. The study of the various aspects of karst regions is called karstology. This includes biological, chemical, ecological, geomorphological, hydrogeological, hydrological, political, socio-economical, and other processes over

470-542: Is a development of karst observed in geological history and preserved within the rock sequence, effectively a fossil karst. There are for example palaeokarst surfaces exposed within the Clydach Valley Subgroup of the Carboniferous Limestone sequence of South Wales which developed as sub-aerial weathering of recently formed limestones took place during periods of non-deposition within the early part of

517-525: Is a karst landscape which is developed beneath a cover of insoluble rocks. Typically this will involve a cover of sandstone overlying limestone strata undergoing solution. In the United Kingdom for example extensive doline fields have developed at Cefn yr Ystrad , Mynydd Llangatwg and Mynydd Llangynidr in South Wales across a cover of Twrch Sandstone which overlies concealed Carboniferous Limestone ,

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564-611: Is characterized by features like poljes above and drainage systems with sinkholes and caves underground. There is some evidence that karst may occur in more weathering -resistant rocks such as quartzite given the right conditions. Subterranean drainage may limit surface water, with few to no rivers or lakes. In regions where the dissolved bedrock is covered (perhaps by debris) or confined by one or more superimposed non-soluble rock strata, distinctive karst features may occur only at subsurface levels and can be totally missing above ground. The study of paleokarst (buried karst in

611-468: Is developed in areas where salt is undergoing solution underground. It can lead to surface depressions and collapses which present a geo-hazard. Karst areas tend to have unique types of forests. The karst terrain is difficult for humans to traverse, so that their ecosystems are often relatively undisturbed. The soil tends to have a high pH, which encourages growth of unusual species of orchids, palms, mangroves, and other plants. Paleokarst or palaeokarst

658-612: Is frequently unseen until the roof of a cavern suddenly collapses. Such events have swallowed homes, cattle, cars, and farm machinery. In the United States, sudden collapse of such a cavern-sinkhole swallowed part of the collection of the National Corvette Museum in Bowling Green, Kentucky in 2014. The world's largest limestone karst is Australia's Nullarbor Plain . Slovenia has the world's highest risk of sinkholes, while

705-525: Is governed by a board of directors made up of representatives from its member municipalities. The number of representatives each municipality can have is determined by the Conservation Authorities Act based on its population within the watershed. Board members act on behalf of the municipalities they represent. Boards collectively determine the direction of authorities including the programs they will carry out and operational decisions throughout

752-475: Is meant to identify threats to and protect drinking water sources. Annual budgets are determined by the board of directors. The portion to be funded by municipal levy (payment by member municipalities) is divided among the participating municipalities according to a formula set out in Ontario Regulation 670/00 which is based on the total value of all lands within each municipality, multiplied by modifiers in

799-399: Is not concentrated along fractures. Karst is also most strongly developed where the water table is relatively low, such as in uplands with entrenched valleys , and where rainfall is moderate to heavy. This contributes to rapid downward movement of groundwater, which promotes dissolution of the bedrock, whereas standing groundwater becomes saturated with carbonate minerals and ceases to dissolve

846-611: Is the following: In very rare conditions, oxidation can play a role. Oxidation played a major role in the formation of ancient Lechuguilla Cave in the US state of New Mexico and is presently active in the Frasassi Caves of Italy. The oxidation of sulfides leading to the formation of sulfuric acid can also be one of the corrosion factors in karst formation. As oxygen (O 2 )-rich surface waters seep into deep anoxic karst systems, they bring oxygen, which reacts with sulfide present in

893-626: The range of the Dinaric Alps , stretching from the northeastern corner of Italy above the city of Trieste , across the Balkan peninsula along the coast of the eastern Adriatic to Kosovo and North Macedonia , where the massif of the Šar Mountains begins. The karst zone is at the northwesternmost section, described in early topographical research as a plateau between Italy and Slovenia . Languages preserving this form include Italian : Carso , German : Karst , and Albanian : karsti . In

940-435: The stratigraphic column ) is important in petroleum geology because as much as 50% of the world's hydrocarbon reserves are hosted in carbonate rock , and much of this is found in porous karst systems. The English word karst was borrowed from German Karst in the late 19th century, which entered German usage much earlier, to describe a number of geological, geomorphological, and hydrological features found within

987-1116: The Act. There are currently 36 conservation authorities in Ontario. Conservation authorities are mandated to develop programs to further the conservation, restoration, development and management of Ontario's natural resources. They carry out programs in natural hazard management on behalf of the province and municipalities, and may also carry out other programs that serve municipal interests, such as nature education, land conservation and management, recreation programs, and research. Management programs generally occur in lands known as conservation areas , restoration areas or wilderness areas , though not all lands managed are necessarily designated as such. Conservation authorities' primary responsibilities are in natural hazard management and environmental protection. While all conservation authorities carry out natural hazard management programs, their roles in environmental protection vary significantly because these are determined by local municipalities. Each conservation authority

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1034-552: The Progressive Conservative government, conservation authorities' provincial funding was drastically reduced from more than CA$ 50 million annually divided among all the authorities to $ 8 million, and the Province reduced the scope of its support to natural hazard management programs and programs for protecting provincially significant conservation land, although the $ 8 million in funding was exclusively for natural hazard management. Other programs were considered to be only in

1081-511: The bedrock. The carbonic acid that causes karst features is formed as rain passes through Earth's atmosphere picking up carbon dioxide (CO 2 ), which readily dissolves in the water. Once the rain reaches the ground, it may pass through soil that provides additional CO 2 produced by soil respiration . Some of the dissolved carbon dioxide reacts with the water to form a weak carbonic acid solution, which dissolves calcium carbonate . The primary reaction sequence in limestone dissolution

1128-450: The complexity of karst aquifers, and need to be supplemented with dye traces , measurement of spring discharges, and analysis of water chemistry. U.S. Geological Survey dye tracing has determined that conventional groundwater models that assume a uniform distribution of porosity are not applicable for karst aquifers. Linear alignment of surface features such as straight stream segments and sinkholes develop along fracture traces . Locating

1175-557: The fissures. The enlarged fissures allow a larger quantity of water to enter which leads to a progressive enlargement of openings. Abundant small openings store a large quantity of water. The larger openings form a conduit system that drains the aquifer to springs. Characterization of karst aquifers requires field exploration to locate sinkholes, swallets , sinking streams , and springs in addition to studying geologic maps . Conventional hydrogeologic methods such as aquifer tests and potentiometric mapping are insufficient to characterize

1222-466: The global demand for drinkable water. Farming in karst areas must take into account the lack of surface water. The soils may be fertile enough, and rainfall may be adequate, but rainwater quickly moves through the crevices into the ground, sometimes leaving the surface soil parched between rains. The karst topography also poses peculiar difficulties for human inhabitants. Sinkholes can develop gradually as surface openings enlarge, but progressive erosion

1269-456: The karst groundwater flow rates from 0.5 to 7 miles per day (0.8 to 11.3 km/d). The rapid groundwater flow rates make karst aquifers much more sensitive to groundwater contamination than porous aquifers. Groundwater in karst areas is also just as easily polluted as surface streams, because Karst formations are cavernous and highly permeable, resulting in reduced opportunity for contaminant filtration. Well water may also be unsafe as

1316-525: The karst regions of the Balkans, Cvijić's 1893 publication Das Karstphänomen describes landforms such as karren, dolines and poljes . In a 1918 publication, Cvijić proposed a cyclical model for karst landscape development. Karst hydrology emerged as a discipline in the late 1950s and the early 1960s in France. Previously, the activities of cave explorers, called speleologists , had been dismissed as more of

1363-552: The last-named locality having been declared a site of special scientific interest in respect of it. Kegelkarst is a type of tropical karst terrain with numerous cone-like hills, formed by cockpits, mogotes , and poljes and without strong fluvial erosion processes. This terrain is found in Cuba, Jamaica, Indonesia, Malaysia, the Philippines, Puerto Rico, southern China, Myanmar, Thailand, Laos and Vietnam. Salt karst (or 'halite karst')

1410-412: The local South Slavic languages , all variations of the word are derived from a Romanized Illyrian base (yielding Latin : carsus , Dalmatian : carsus ), later metathesized from the reconstructed form * korsъ into forms such as Slovene : kras and Serbo-Croatian : krš , kras , first attested in the 18th century, and the adjective form kraški in the 16th century. As

1457-410: The local interest and the Province stated that those programs could be funded by municipalities if the municipalities wished them to continue. At the same time, the government provided conservation authorities with new powers to charge fees and generate revenue. As a result, most conservation authorities became more entrepreneurial to generate the revenue needed to continue their local programming. Funding

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1504-637: The most dramatic of these formations can be seen in Thailand 's Phangnga Bay and at Halong Bay in Vietnam . Calcium carbonate dissolved into water may precipitate out where the water discharges some of its dissolved carbon dioxide. Rivers which emerge from springs may produce tufa terraces, consisting of layers of calcite deposited over extended periods of time. In caves, a variety of features collectively called speleothems are formed by deposition of calcium carbonate and other dissolved minerals. Interstratal karst

1551-453: The municipality's share of the levy (30% x 10 million). If the total value in the jurisdiction, after adding together all such values for all the participating municipalities, is 20 million dollars, the municipality's share of the levy is 15% (3 million divided by 20 million). In 2013, municipal levies accounted for approximately 48% of all conservation authorities' revenue; self-generated revenue accounted for 40%; provincial funding, including

1598-408: The natural hazards management funding as well as Clean Water Act funding and various other grants for special projects, accounted for 10%; and federal funding, for special projects and Areas of Concern, 2%. Each conservation authority has a Regulation of Development, Interference with Wetlands and Alterations to Shorelines and Watercourses under the Conservation Authorities Act which conforms to

1645-704: The period. Sedimentation resumed and further limestone strata were deposited on an irregular karst surface, the cycle recurring several times in connection with fluctuating sea levels over prolonged periods. Pseudokarsts are similar in form or appearance to karst features but are created by different mechanisms. Examples include lava caves and granite tors —for example, Labertouche Cave in Victoria, Australia —and paleocollapse features. Mud Caves are an example of pseudokarst. Karst formations have unique hydrology, resulting in many unusual features. A karst fenster (karst window) occurs when an underground stream emerges onto

1692-477: The power to levy their member municipalities. As registered charities, they are eligible for certain government grants. Under Section 39 of the Conservation Authorities Act , the Province may also provide grants to conservation authorities. Historically, conservation authorities' funding was split evenly between the Province and member municipalities. In the mid-1990s, under the Red Tape Reduction Act of

1739-417: The quality of life in communities throughout the province. Some of the activities conservation authorities may include: Conservation Ontario is the umbrella organization for all 36 regional Conservation Authorities in the Province of Ontario: Karst Karst ( / k ɑːr s t / ) is a topography formed from the dissolution of soluble carbonate rocks such as limestone and dolomite . It

1786-420: The regulation and by the proportion of the municipality which falls within the authority's jurisdiction, as a proportion of the total modified value within the authority's jurisdiction. For example, if 30% of a municipality's area falls within an authority's jurisdiction, and the total value of land in that municipality after applying modifiers is 10 million dollars, 3 million dollars is the value used to calculated

1833-757: The river flows into a cave in a formation known as the Madison Limestone and then rises again 800 m ( 1 ⁄ 2  mi) down the canyon in a placid pool. A turlough is a unique type of seasonal lake found in Irish karst areas which are formed through the annual welling-up of water from the underground water system. Main Article Aquifer#Karst Karst aquifers typically develop in limestone . Surface water containing natural carbonic acid moves down into small fissures in limestone. This carbonic acid gradually dissolves limestone thereby enlarging

1880-625: The surface between layers of rock, cascades some distance, and then disappears back down, often into a sinkhole. Rivers in karst areas may disappear underground a number of times and spring up again in different places, even under a different name, like Ljubljanica , the "river of seven names". Another example of this is the Popo Agie River in Fremont County, Wyoming , where, at a site named "The Sinks" in Sinks Canyon State Park ,

1927-415: The surface, complex underground drainage systems (such as karst aquifers ) and extensive caves and cavern systems may form. Erosion along limestone shores, notably in the tropics , produces karst topography that includes a sharp makatea surface above the normal reach of the sea, and undercuts that are mostly the result of biological activity or bioerosion at or a little above mean sea level . Some of

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1974-1002: The system ( pyrite or hydrogen sulfide ) to form sulfuric acid (H 2 SO 4 ). Sulfuric acid then reacts with calcium carbonate, causing increased erosion within the limestone formation. This chain of reactions is: This reaction chain forms gypsum . The karstification of a landscape may result in a variety of large- or small-scale features both on the surface and beneath. On exposed surfaces, small features may include solution flutes (or rillenkarren), runnels , limestone pavement (clints and grikes), kamenitzas collectively called karren or lapiez. Medium-sized surface features may include sinkholes or cenotes (closed basins), vertical shafts, foibe (inverted funnel shaped sinkholes), disappearing streams, and reappearing springs . Large-scale features may include limestone pavements , poljes , and karst valleys. Mature karst landscapes, where more bedrock has been removed than remains, may result in karst towers , or haystack/eggbox landscapes. Beneath

2021-527: The vote. If a municipality pays more than 50% of the budget, its share of the vote is capped at 50% and the shares of other municipalities are increased proportionately. Conservation authorities are administered by a General Manager or Chief Administrative Officer who reports to the Board. Conservation authorities' funding comes from a variety of sources. Conservation authorities have the power to generate revenue through fees and other self-generated revenue, and also

2068-461: The water may have run unimpeded from a sinkhole in a cattle pasture, bypassing the normal filtering that occurs in a porous aquifer . Sinkholes have often been used as farmstead or community trash dumps . Overloaded or malfunctioning septic tanks in karst landscapes may dump raw sewage directly into underground channels. Geologists are concerned with these negative effects of human activity on karst hydrology which, as of 2007 , supplied about 25% of

2115-507: The western Highland Rim in the eastern United States is at the second-highest risk of karst sinkholes. In Canada, Wood Buffalo National Park , Northwest Territories contains areas of karst sinkholes. Mexico hosts important karst regions in the Yucatán Peninsula and Chiapas . The West of Ireland is home to The Burren , a karst limestone area. The South China Karst in the provinces of Guizhou , Guangxi , and Yunnan provinces

2162-450: The year. For most matters, each member is entitled to one vote, and decisions are made by majority vote. For voting on non-matching levies (levies against municipalities which are not matched by the Province), voting is done using a weighted vote, where each municipality has the same share of the vote as the share of the budget that it pays, except that no municipality can have more than 50% of

2209-630: Was further cut by 5% to $ 7.6 million in 2000. In 2012, under the Liberal government, funding was cut again by 2% to $ 7.448 million, and in 2019, under the Progressive Conservative government, it was cut again by 48% to $ 3.58 million. The Province also provides funding to conservation authorities for the implementation of the Clean Water Act , brought in as a result of the inquiry into the E. coli outbreak in Walkerton in 2000 which resulted in six deaths, which

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