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Prairie Pothole Region

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The Prairie Pothole Region (PPR; French : Région des cuvettes/fondrières des prairies ) is an expansive area of the northern Great Plains that contains thousands of shallow wetlands known as potholes . These potholes are the result of glacier activity in the Wisconsin glaciation , which ended about 10,000 years ago. The decaying ice sheet left behind depressions formed by the uneven deposition of till in ground moraines . These depressions are called potholes, glacial potholes, kettles , or kettle lakes. They fill with water in the spring , creating wetlands, which range in duration from temporary to semi-permanent. The region covers an area of about 800,000 sq. km and expands across three Canadian provinces ( Saskatchewan , Manitoba , and Alberta ) and five U.S. states ( Minnesota , Iowa , North and South Dakota , and Montana ). The hydrology of the wetlands is variable, which results in long term productivity and biodiversity. The PPR is a prime spot during breeding and nesting season for millions of migrating waterfowl.

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20-467: Few natural surface water drainage systems occur in the region as pothole wetlands are not connected by surface streams. They receive most of their water from spring snowmelt and precipitation. Some pothole wetlands also receive groundwater inflow, so they typically last longer each year than those that only receive water from precipitation. Shorter-duration wetlands fed only by precipitation typically are sources of groundwater recharge . The hydrology of

40-458: A direct connection with the water cycle . It has increased evaporation yet decreased precipitation, runoff, groundwater, and soil moisture. This has altered surface water levels. Climate change also enhances the existing challenges we face in water quality. The quality of surface water is based on the chemical inputs from the surrounding elements such as the air and the nearby landscape. When these elements are polluted due to human activity, it alters

60-659: A network of approximately 500 stream gages collecting real time data from all across the state. This then contributes to the 8,000 stream gage stations that are overseen by the USGS national stream gage record. This in turn has provided to date records and documents of water data over the years. Management teams that oversee the distribution of water are then able to make decisions of adequate water supply to sectors. These include municipal, industrial, agricultural, renewable energy (hydropower), and storage in reservoirs. Due to climate change , sea ice and glaciers are melting, contributing to

80-705: A result of evaporation as well as water moving into the ground becoming ground-water . Alongside being used for drinking water, surface water is also used for irrigation, wastewater treatment , livestock , industrial uses, hydropower , and recreation. For USGS water-use reports, surface water is considered freshwater when it contains less than 1,000 milligrams per liter (mg/L) of dissolved solids. There are three major types of surface water. Permanent (perennial) surface waters are present year round, and includes lakes , rivers and wetlands ( marshes and swamps ). Semi-permanent (ephemeral) surface water refers to bodies of water that are only present at certain times of

100-472: Is water located on top of land , forming terrestrial (surrounding by land on all sides) waterbodies , and may also be referred to as blue water , opposed to the seawater and waterbodies like the ocean . The vast majority of surface water is produced by precipitation . As the climate warms in the spring, snowmelt runs off towards nearby streams and rivers contributing towards a large portion of human drinking water . Levels of surface water lessen as

120-528: Is a significant factor in the loss of wetlands in the PPR. More than half of the wetlands have been drained for farming. In particular, 90% of the prairie wetlands of the Minnesota River basin have been lost as habitat. The wetlands that do persist, surrounded as they are by agricultural lands, are also affected. Chemical runoff, sedimentation, and nutrient flow into the wetlands have adverse impacts. Climate change

140-401: Is an adverse factor in the long-term viability of PPR wetlands for breeding ducks and other birds. Without mitigation, severe droughts and rising temperatures will cause many pothole wetlands to dry up sooner in the spring. In turn, due to the timing of waterfowl migrations, these dried wetlands will not present suitable breeding habitat. Warming-related drought may affect as much as 90 percent of

160-494: Is caused by over-pumping. Aquifers near river systems that are over-pumped have been known to deplete surface water sources as well. Research supporting this has been found in numerous water budgets for a multitude of cities. Response times for an aquifer are long (Young & Bredehoeft 1972). However, a total ban on ground water usage during water recessions would allow surface water to retain better levels required for sustainable aquatic life . By reducing ground water pumping,

180-485: Is the forcing of surface water sourced from rivers and streams to produce energy. Surface water can be measured as annual runoff. This includes the amount of rain and snowmelt drainage left after the uptake of nature, evaporation from land, and transpiration from vegetation. In areas such as California , the California Water Science Center records the flow of surface water and annual runoff by utilizing

200-419: Is what creates the tidal effects. Moreso, the impact of climate change on water is likely to intensify as observed through the rising sea levels , water acidification and flooding . This means that climate change has pressure on water bodies. Climate change significantly affects bodies of water through rising temperatures, altered precipitation patterns, and sea-level rise. Warmer temperatures lead to

220-457: The PPR's remaining wetlands. Simulations suggest that climate change will shift the most productive wetlands from the center of the region (southeastern Saskatchewan and the Dakotas) to edges of the PPR in the east and north. However, research has suggested that the effect of global warming is overshadowed by that of intensified land use and drainage of wetlands. Surface water Surface water

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240-436: The chemistry of the water. Surface and groundwater are two separate entities, so they must be regarded as such. However, there is an ever-increasing need for management of the two as they are part of an interrelated system that is paramount when the demand for water exceeds the available supply (Fetter 464). Depletion of surface and ground water sources for public consumption (including industrial, commercial, and residential)

260-420: The potholes is very variable, responding to changes in precipitation and groundwater, and results in regular wet-and-dry cycles. The vegetation of the PPR consists of emergent plants and tall grasses, while the prairie surrounding the region has dense grassland vegetation. The composition of a local plant community is heavily affected by the amount of water available. In wetter wetlands that retain water through

280-490: The region is one of North America's most important breeding areas for ducks . Although the region contains only about one-tenth of the continent's habitat area for breeding of waterfowl, roughly half the primary species of game ducks on the continent breed there. The region accounts for more than 60% of the breeding populations of mallard , gadwall , blue-winged teal , northern shoveler , northern pintail , redhead , and canvasback ducks. Conversion of land for agriculture

300-661: The rise in sea levels. As a result, salt water from the ocean is beginning to infiltrate our freshwater aquifers contaminating water used for urban and agricultural services. It is also affecting surrounding ecosystems as it places stress on the wildlife inhabiting those areas. It was recorded by the NOAA in the years 2012 to 2016, ice sheets in Greenland and the Antarctic reduced by 247 billion tons per year. This number will continue to increase as global warming persists. Climate change has

320-405: The summer, the common plant is hard-stem bulrush , along with soft-stem bulrush and common threesquare in slightly drier regions of the wetlands. The vegetation in permanently flooded wetlands is more aquatic; duckweeds , pondweeds , aquatic buttercups , and aquatic smartweeds are some of the most common. In drier wetlands of the PPR, the vegetation varies from spikerush , which is found in

340-991: The surface of Earth or another planet. The term most often refers to oceans , seas , and lakes , but it includes smaller pools of water such as ponds , wetlands , or more rarely, puddles . A body of water does not have to be still or contained; rivers , streams , canals , and other geographical features where water moves from one place to another are also considered bodies of water. Most are naturally occurring geographical features , but some are artificial. There are types that can be either. For example, most reservoirs are created by engineering dams , but some natural lakes are used as reservoirs . Similarly, most harbors are naturally occurring bays , but some harbors have been created through construction. Bodies of water that are navigable are known as waterways . Some bodies of water collect and move water, such as rivers and streams, and others primarily hold water, such as lakes and oceans. Bodies of water are affected by gravity, which

360-543: The surface water supplies will be able to maintain their levels, as they recharge from direct precipitation , surface runoff , etc. It is recorded by the Environmental Protection Agency (EPA), that approximately 68 percent of water provided to communities in the United States comes from surface water. Waterbodies A body of water or waterbody is any significant accumulation of water on

380-698: The wetter areas of the wetland, to foxtail barley and wheatgrass on the outer edges of the wetland. The variable availability of water in the Prairie Pothole Region is buffered by an abundant seed bank under the soil, comprising species that thrive under different water regimes. During times of drought, shortgrass species increase and expand their range, while during wetter periods, tallgrass and mixed prairie communities become more common. The Prairie Pothole Region provides important habitats for migratory waterfowl and other wildlife, supporting more than 50% of North America 's migratory waterfowl. In particular,

400-408: The year including seasonally dry channels such as creeks , lagoons and waterholes . Human-made surface water is water that can be continued by infrastructures that humans have assembled. This would be dammed artificial lakes , canals and artificial ponds (e.g. garden ponds ) or swamps. The surface water held by dams can be used for renewable energy in the form of hydropower. Hydropower

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