a) Describe the position of the water table. b) Suggest two situations that migh
ID: 297015 • Letter: A
Question
a) Describe the position of the water table. b) Suggest two situations that might cause this marsh to disappear: one natural cause and one cause related to human activities. c) Wetlands commonly exist along the borders of streams in either the zone of transportation or at the mouth (where they may also border the ocean). How might these wetlands aid in preventing flooding? You must give two reasons. Question 8: Wetlands and Floods (Points: 8 Consider the following image taken of the wetlands at the Heard Science Museum and Nature Sanctuary in McKinney Wetlands are defined by their periodic or perpetual saturation, their water-adapted foliage, and their poorly- drained soils suited to anaerobic (low-to-no oxygen) conditions a) Describe the position of the water table. b) Suggest two situations that might cause this marsh to disappear: one natural cause and one cause related to human activities. Wetlands commonly exist along the borders of streams in either the zone of transportation or at the mouth (where they may also border the ocean). How might these wetlands aid in preventing flooding? You must give two reasons c) Bonus (Points: 4) Why do most of the world's largest rivers drain toward passive continental margins? (You must be complete to get the bonus).Explanation / Answer
A) water table is the surface above the zone of saturation. Watera table is a surface in which water pressure head is equal to atmospheric pressure. It may be contemplate as the surface of subsurface materials which is saturated with groundwater. Below the water table layers of permeable rock are there. In less permeable soils tight bedrock forms and water table may be more difficult to define.
B) causes of dissapearing of water table are÷
*natural cause
Increasing population - as population is increased all the facilitres such as houses , shops, roads increases to fulfill the people demands. This in turn decreases the open area for seepage of water into ground and leads to disappearing of water table.
*human activities
Increasing industries- manufacturing processes in industries requires huge amount of water . If industries increases the requirement of water also increases. Therefore increase of industries contributes to disappearing of water table.
C) two reasons how wetlands prevents flood -
1) wetlands prevent flooding by temporarily storing and slowly releasing stormwater.
2) wetlands reduce water flow and allows sediments and associated pollutants to settle. Thus roots of wetland vegetation hold soils in place and strengthen the banks of rivers and streams.
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