Assomption River at Chutes Monte-à-Peine Park in Matawinie Regional County Municipality, Quebec.

The Assomption River (in French Rivière l'Assomption, named after the Assumption of Mary) is the most important waterway in the Lanaudière region of Quebec, Canada, is over 200 km long, and has a drainage basin of 4220 km². Its source is the Mont Tremblant massif. Seven significant rivers flow into the Assomption (de la Boule, Versailles, Noire, la Chaloupe, Ouareau, Saint-Esprit, and Achigan) before it flows into the Rivière des Prairies at Repentigny, Quebec. Image File history File linksMetadata Download high-resolution version (2560x1920, 3454 KB) La rivière lAssomption à la hauteur de Saint-Jean-de-Matha, au parc des Chutes Monte-à-Peine (Québec, Canada), en août 2005. ... Image File history File linksMetadata Download high-resolution version (2560x1920, 3454 KB) La rivière lAssomption à la hauteur de Saint-Jean-de-Matha, au parc des Chutes Monte-à-Peine (Québec, Canada), en août 2005. ... Matawinie is a county regional municipality of Quebec in Canada. ... The Assumption has been a subject of Christian art for centuries. ... Lanaudière is one of the 17 administrative regions of Quebec, situated immediately to the northeast of Montreal. ... Motto: Je me souviens (French: I remember) Official languages French Flower Blue Flag Iris (Iris versicolor Linné) Tree Yellow Birch Bird Snowy Owl Capital Quebec City Largest city Montreal Lieutenant-Governor Lise Thibault Premier Jean Charest (PLQ) Parliamentary representation  - House seats  - Senate seats 75 24 Area Total  - Land  - Water  (% of... A drainage basin is the area within the drainage basin divide (yellow outline), and drains the surface runoff and river discharge (blue lines) of a contiguous area. ... Mont-Tremblant, Quebec is a small village in the Laurentian mountains about one hour forty-five minutes north of Montreal. ... Dusk over ÃŽle de la Visitation and the Pont Papineau-Leblanc, Rivière des Prairies The Rivière des Prairies (sometimes called the Back River in English) is a channel of the Ottawa River in southwestern Quebec, Canada. ... Repentigny Ville (City) in Québec, located north of Montréal, on the St. ...

About 150000 people live in the drainage area of this river.

Geography

The L'Assomption River watershed overlaps two natural environments, the Laurentian Mountains and the St-Lawrence lowlands, which cover about a third of the watershed area. Its relief is a uniform plain with some hills (from 0 to 100 m) dominated by agricultural landuse. The texture of the soil is rather fine and rests on an impermeable argillaceous (clay) base. The Laurentians mountains in the Hautes-Gorges Quebec national parc, Charlevoix, Quebec, Canada The Laurentian mountains (French: Laurentides) are a mountain range in southern Quebec, Canada, north of the St. ... An argillite is a fine-grained sedimentary rock composed predominately of indurated clay particles. ...

The Laurentian Mountains form part of the Canadian Shield. They are separated from the lowlands by a well defined escarpment that rises about 150 metres. This escarpment has many waterfalls. The Laurentians Mountains have an average height of 230 metres in the south and 460 metres in the north. And there are even mountains of over 600 metres in the Mont Tremblant massif where the L'Assomption River forms. Canadian Shield The Canadian Shield— also called the Precambrian Shield, Laurentian Shield, Bouclier Canadien (French), or Laurentian Plateau— is a large shield covered by a thin layer of soil that forms the nucleus of the North American craton. ... In geology, an escarpment is a transition zone between different physiogeographic provinces that involves an elevation differential, often involving high cliffs. ...

Hydrography

From north to south the average slope of the river decreases. The steeper slopes of the highlands create a fast current whereas the lowland flats produces a slower flow. Moreover, the river meanders a lot which is especially evident at the town of L'Assomption, almost completely surrounded by a large loop of the river. Meanders in a river A meander is a bend in a river, also known as an oxbow loop. ... LAssomption is a town in southwestern Quebec, Canada on the LAssomption River in the Regional County Municipality of LAssmomption. ...

The L'Assomption River watershed has 490 lakes of which 24 have a surface area larger than 1 square kilometre. Most of the lakes are located in the Laurentian highlands.

Water quality

Urban and industrial pollution

The water quality of the L'Assomption River is seriously affected by the area's social-economic conditions. Since 1950, the situation has been complicated by the urbanization of the river banks, by diversified agriculture, and by industrialisation along the southern portion of the river. Although the source of pollution has changed since 1950, because of strict environmental laws and the use of water purification equipment, water pollution is still not fully curbed. A factory in Ilmenau (Germany) around 1860 Industrialization or an Industrial Revolution is a process of social and economic change whereby a human society is transformed from a pre-industrial (an economy where the amount of capital accumulated per capita is low) to an industrial state (see Pre-industrial society). ... Pollution is the release of environmental contaminants. ...

Over 150000 people live in the river's watershed in 43 municipalities, of which the most important are Repentigny, Joliette, Le Gardeur, and L'Assomption. In addition, the northern portion of the river's watershed is a popular vacation area, swelling the population by about 45000 people during the vacation season. Joliette is a town is southwest-central Quebec, Canada on the Rivière lAssomption and is the seat of the Regional County Municipality of Joliette. ... Le Gardeur is a town in southwestern Quebec, Canada on the Rivière LAssomption in the Regional County Municipality of LAssomption. ...

The majority of the municipalities take their drinking water from the river and provide it to more than 100000 people. The drinking water supply to other residences and country cottages, distributed over approximately 90% of the watershed area, comes from water wells. Cable tool water well drilling rig in Kimball, West Virginia. ...

Agricultural pollution

Besides the urban and industrial pollution, agricultural pollution also contributes greatly to the environment's contamination.

Agriculture has a dominant position along the river: in 1995 there were 1305 producers with 60221 ha (602.21 km²) under cultivation and possessing 73563 animals.

Agricultural pollution takes several forms: direct pollution (discharge of manure directly in the rivers) and diffused pollution (infiltration of fertilizer products in the groundwater). Diffused pollution is difficult to control because it has a multitude of sources throughout the whole region. Yet without a solution to this problem the water quality of the river will never have the desired quality. Animal manure is often a mixture of animals feces and bedding straw, as in this example from a stable. ... spreading manure, an organic fertilizer Fertilizers (British English fertilisers) are compounds given to plants to promote growth; they are usually applied either via the soil, for uptake by plant roots, or by foliar feeding, for uptake through leaves. ... Groundwater is water located beneath the ground surface in soil pore spaces and in the fractures of geologic formations. ...

List of towns crossed by L'Assomption River

• Saint-Côme, Quebec
• Saint-Alphonse-de-Rodriguez, Quebec
• Sainte-Béatrix, Quebec
• Saint-Jean-de-Matha, Quebec
• Sainte-Mélanie, Quebec
• Saint-Félix-de-Valois, Quebec
• Notre-Dame-des-Prairies, Quebec
• Saint-Charles-Borromée, Quebec
• Joliette, Quebec
• Saint-Paul-de-Joliette, Quebec
• Saint-Gérard-Majella (merged with L'Assomption)
• L'Assomption, Quebec
• Repentigny, Quebec
• Le Gardeur, Quebec (merged with Repentigny)
• Charlemagne, Quebec

Joliette is a town is southwest-central Quebec, Canada on the Rivière lAssomption and is the seat of the Regional County Municipality of Joliette. ... LAssomption is a town in southwestern Quebec, Canada on the LAssomption River in the Regional County Municipality of LAssmomption. ... Repentigny Ville (City) in Québec, located north of Montréal, on the St. ... Le Gardeur is a town in southwestern Quebec, Canada on the Rivière LAssomption in the Regional County Municipality of LAssomption. ... Charlemagne, Quebec is a town located 20. ...

External links

• Corporation de l'Aménagement de la Rivière l'Assomption
• De l'Outaragasipi à la Rivière l'Assomption