Hoover Dam2
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The Hoover Dam was built on the Colorado River between Nevada and Arizona to address water needs in the growing Southwestern United States. It controls flooding, provides irrigation water for farming, and generates hydroelectric power. The location was suitable due to the deep sandstone canyons which allowed for water storage and a narrow dam. While the dam provided benefits like water and power, it also displaced Native American settlements and disrupted natural river flows and ecosystems.
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Note for Hoover Dam
The document discusses the negative environmental impacts of the Hoover Dam. It begins by providing background on the dam's construction during the Great Depression. It then examines four main negative effects: 1) riverbed lowering due to water storage, 2) greenhouse gas emissions from submerged vegetation and soil, 3) disruption of local ecosystems and endangered species, 4) changes in water temperature, flow, oxygen levels and salt content downstream. While the dam provided economic benefits, greater consideration of environmental factors is needed for future infrastructure projects.
Hoover dam and the negative effects on environment
The document summarizes some of the negative environmental impacts of the Hoover Dam on the Colorado River ecosystem. It discusses how the dam led to lowering of the riverbed downstream, releasing of greenhouse gases from the reservoir, and destruction of local ecosystems and fish species. Several endangered fish native to the Colorado River were negatively affected by changes in water flow and temperature from the dam. While the dam provided benefits, its construction significantly altered the natural environment of the Colorado River basin.
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A student presentation made by students in "The Waterless West" course, part of the 2011 NCSSM Summer Symposium on the Global Water Crisis
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The Hoover Dam was constructed on the Colorado River between 1930-1936. It was originally named Boulder Dam and cost $49 million to build. The dam is 660 feet thick, 1,244 feet long and impounds Lake Mead, the largest reservoir in the United States. It provides flood control, water storage and hydroelectric power, helping to reclaim agricultural land in California. At the time of completion, it was the largest concrete structure and public works project in U.S. history.
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The Hoover Dam was constructed between 1931-1936 under the Hoover administration. It provided employment for thousands of Americans during the Great Depression. The dam created Lake Mead and generates hydroelectric power by transporting 90,000 gallons of water per second through its generators to supply water and power to surrounding states. However, scientists have noted that due to global warming, the water supply from the dam and nearby reservoirs has decreased by half since 2007, which could impact future water demands if the trend continues.
Hoover dam
The Hoover Dam is a concrete arch-gravity dam located on the Colorado River between the US states of Arizona and Nevada. [1] It was constructed between 1931 and 1936 during the Great Depression. [2] Some of the major engineering challenges in constructing the Hoover Dam included pouring over 4.36 million cubic yards of concrete, diverting the river during construction using tunnels, and removing loose rocks from the canyon. [3] The dam provides benefits like electricity, water supply, and flood control, but also has negative environmental impacts such as releasing methane and lowering the river bed.
2011 10 5 dams.ppt
Dams have several ecological impacts. They block sediment and change water flows, damaging fish habitats and interrupting lifecycles. Sediment builds up behind dams, increasing flood risks. Cleared water lacks nutrients and cover for downstream organisms. Stagnant water breeds diseases. Dams displace many people and change flooding patterns vital to agriculture. Major dams like China's Three Gorges and Egypt's Aswan dams displaced over 1 million and 60,000 people respectively.
DAMS AND THIER ENVIRONMENTAL IMPACTS
This document discusses dams, their structure, types, functions, and environmental impacts. Dams are barriers constructed across waterways to impound water for uses like irrigation, flood control, and hydropower. They come in various materials and styles, including embankment, gravity, and arch dams. While dams provide benefits, they also harm ecosystems by blocking animal migration, altering downstream flows, and trapping sediments. When built, dams can displace people and damage cultural sites. Dam failures can occur due to earthquakes, flooding, erosion, or design flaws, sometimes with severe consequences. Overall, the document outlines the key aspects of dams and some of their tradeoffs environmentally and socially.
Recommended
Note for Hoover Dam
The document discusses the negative environmental impacts of the Hoover Dam. It begins by providing background on the dam's construction during the Great Depression. It then examines four main negative effects: 1) riverbed lowering due to water storage, 2) greenhouse gas emissions from submerged vegetation and soil, 3) disruption of local ecosystems and endangered species, 4) changes in water temperature, flow, oxygen levels and salt content downstream. While the dam provided economic benefits, greater consideration of environmental factors is needed for future infrastructure projects.
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Student Presentation: The Hoover Dam by Sid and Vic
A student presentation made by students in "The Waterless West" course, part of the 2011 NCSSM Summer Symposium on the Global Water Crisis
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The Hoover Dam was constructed on the Colorado River between 1930-1936. It was originally named Boulder Dam and cost $49 million to build. The dam is 660 feet thick, 1,244 feet long and impounds Lake Mead, the largest reservoir in the United States. It provides flood control, water storage and hydroelectric power, helping to reclaim agricultural land in California. At the time of completion, it was the largest concrete structure and public works project in U.S. history.
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The Hoover Dam was constructed between 1931-1936 under the Hoover administration. It provided employment for thousands of Americans during the Great Depression. The dam created Lake Mead and generates hydroelectric power by transporting 90,000 gallons of water per second through its generators to supply water and power to surrounding states. However, scientists have noted that due to global warming, the water supply from the dam and nearby reservoirs has decreased by half since 2007, which could impact future water demands if the trend continues.
Hoover dam
The Hoover Dam is a concrete arch-gravity dam located on the Colorado River between the US states of Arizona and Nevada. [1] It was constructed between 1931 and 1936 during the Great Depression. [2] Some of the major engineering challenges in constructing the Hoover Dam included pouring over 4.36 million cubic yards of concrete, diverting the river during construction using tunnels, and removing loose rocks from the canyon. [3] The dam provides benefits like electricity, water supply, and flood control, but also has negative environmental impacts such as releasing methane and lowering the river bed.
2011 10 5 dams.ppt
Dams have several ecological impacts. They block sediment and change water flows, damaging fish habitats and interrupting lifecycles. Sediment builds up behind dams, increasing flood risks. Cleared water lacks nutrients and cover for downstream organisms. Stagnant water breeds diseases. Dams displace many people and change flooding patterns vital to agriculture. Major dams like China's Three Gorges and Egypt's Aswan dams displaced over 1 million and 60,000 people respectively.
DAMS AND THIER ENVIRONMENTAL IMPACTS
This document discusses dams, their structure, types, functions, and environmental impacts. Dams are barriers constructed across waterways to impound water for uses like irrigation, flood control, and hydropower. They come in various materials and styles, including embankment, gravity, and arch dams. While dams provide benefits, they also harm ecosystems by blocking animal migration, altering downstream flows, and trapping sediments. When built, dams can displace people and damage cultural sites. Dam failures can occur due to earthquakes, flooding, erosion, or design flaws, sometimes with severe consequences. Overall, the document outlines the key aspects of dams and some of their tradeoffs environmentally and socially.
Ecological impacts of dams
Dams can have significant ecological impacts:
1) They obstruct fish migration and disrupt populations.
2) Water quality is reduced as still water gathers pollution and alters temperatures affecting oxygen and chemical reactions.
3) Sediment builds up behind dams, raising water levels and putting pressure on dam walls which could eventually burst, flooding towns.
Hoover dam ppt
the seminar presentation on hoover dam.
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Impact of Large Dams on Climate
The document discusses the impacts of large dams on the environment and climate, using the Tehri Dam in Uttarakhand, India as a case study. It summarizes that the Tehri Dam provides benefits like hydroelectric power, flood control, irrigation, and tourism, but also resulted in mass displacement of people, deforestation, and impacts on biodiversity. Mitigation efforts were undertaken for afforestation, erosion control, and protecting displaced communities and the environment.
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Dams and water diversions can have both positive and negative ecological impacts. Positively, dams provide benefits like hydropower, irrigation, flood control and more. However, they can also harm wildlife such as disrupting fish migration and reducing sediments downstream. This impacts wetland species and water quality. Dams may also cause erosion of downstream areas and change water temperature, flow and salinity levels. Large dam projects have additionally displaced many people from their homes. Examples highlighted are the Hoover Dam on the Colorado River and the Aswan High Dam on the Nile River.
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Hoover Dam is a concrete arch-gravity dam on the Colorado River between Nevada and Arizona that was constructed between 1931-1936. It was built to provide flood control, irrigation water storage and hydroelectric power. Over 100 lives were lost during its construction due to extreme heat and dangerous working conditions. The dam impounds Lake Mead, the largest reservoir in the US. It continues to provide power to millions in the Southwest and is a major tourist attraction receiving nearly 1 million visitors annually.
Ecological impacts of dams and water diversions
Dams impact rivers and their ecosystems in several ways. They block migratory fish from accessing spawning habitats upstream, as fish ladders are often ineffective. This disrupts fish life cycles and populations. Dams also alter sediment and water flow, affecting water quality, aquatic habitats, and nutrient levels downstream. Large dams significantly change river landscapes and environments, sometimes flooding important habitats and destroying cultural heritage sites.
The 5 largest dams and their ecological impact
The document discusses the ecological impacts of dams, including negative effects on fish life from disrupted currents and migration cycles, loss of downstream sediment and nutrients, disease spread from stagnant water, and displacement of people and wildlife from flooded lands. Specific dams highlighted include China's Three Gorges Dam, which displaced over 1.2 million people, and Egypt's Aswan Dam, which has caused problems with soil salinization, bilharzia infection, and controlled flooding of farmlands.
Effect of dam on biodiversity
constructing dams may create adverse environmental impacts, sometimes leads to decline of biodiversity.
Impact of Building Dam on River Ecosystem and Its Preventive Measures
The document discusses the environmental impacts of dam construction on river ecosystems. It states that dams can result in physical, chemical, and biological changes to ecosystems upstream, in the reservoir, and downstream. Specific impacts mentioned include blocking fish migration, changes in sediment flow, flooding of natural habitats, and species changes from altered flooding patterns. The document also provides a case study on the impacts of the Farakka Barrage on the Ganges River in Bangladesh, such as reduced sediment and water flows. It notes some proposed solutions like building additional reservoirs and canals. The conclusion discusses how dams have both benefits and detriments and calls for further studying impacts and improving engineering to reduce negative effects.
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This document discusses dams and their environmental and social impacts. It begins by defining dams and explaining their purposes, which include irrigation, flood control, hydropower, and navigation. It then describes the main types of dams and discusses their environmental performance, noting impacts on terrestrial and aquatic ecosystems from habitat loss and changes to natural flow regimes. Socially, dams can displace large populations and disrupt livelihoods when people are resettled or downstream access to resources is reduced. Planning for dams often undercounts affected people and resettlement efforts are frequently inadequate.
Dams and their role in environment.
Dams serve several purposes such as generating hydroelectric power, providing water for irrigation and domestic consumption, and controlling floods and droughts. The document discusses the types of dams including gravity dams, earth dams, arch dams, and buttress dams. It also outlines both the benefits of dams such as water supply and flood control, as well as the environmental impacts including effects on fish, soil erosion, disease spread, and displacement of people. Examples of major dams in India are provided such as the Tehri Dam, Sardar Sarovar Dam, Nagarjuna Sagar Dam, and Bhakra Dam.
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The document discusses the effects of constructing dams, including both environmental impacts and impacts on displaced human populations. Dams interrupt natural water cycles, cause erosion, change river temperatures, and stop fish migration. When constructing the Bargi Dam in India, over 5,000 families were displaced, but the government initially failed to properly rehabilitate the affected people. After years of protests, the government eventually worked with the displaced peoples' union to provide compensation and rehabilitation. The Three Gorges Dam in China displaced over 1 million people and damaged cultural and archaeological sites. Globally, an estimated 40-80 million people have been displaced by dam construction without adequate rehabilitation.
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- Multiple factors contribute to low dissolved oxygen in Hood Canal, including strong stratification that prevents mixing of deep waters, slow circulation, and high productivity that leads to decomposition of organic matter and oxygen depletion.
- Increasing human development in the area has elevated nutrient levels in Hood Canal waters, fueling more rapid algal growth and higher oxygen demand when this material decomposes.
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The document discusses dams, including their history, types, benefits, and costs. It provides details on:
- The rapid increase in large dam construction during the 20th century, with over 45,000 large dams built globally by the end of the century.
- The main types of dams - embankment dams made of earth/rock fill and concrete dams made of mass concrete.
- The key benefits of dams including water supply, flood control, hydropower, irrigation, and recreation.
- Some costs associated with dams and the complex relationship between climate change and dams.
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This document provides an overview of dams in Ethiopia, including:
1) Ethiopia has significant water resources potential but development has been low, with less than 10% of irrigation and hydropower potential developed.
2) There are over 50 large dams existing in Ethiopia, which were built mainly for hydropower, irrigation, and water supply. However, many microdams experience problems like seepage, sedimentation, and structural failures.
3) Several large dams are under construction, including Gibe III, the largest, which will provide 1870 MW of hydropower once completed.
4) While dams provide benefits, they can also negatively impact the environment through issues like reservoir sedimentation reducing storage
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1. They can spread diseases by creating habitats for disease-carrying animals like mosquitoes and snails.
2. They often require resettlement of nearby populations, disrupting communities and livelihoods.
3. Dams block sediment flow and damage aquatic ecosystems downstream by preventing nutrient transport.
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Dams can have significant ecological impacts:
1) They obstruct fish migration and disrupt populations.
2) Water quality is reduced as still water gathers pollution and alters temperatures affecting oxygen and chemical reactions.
3) Sediment builds up behind dams, raising water levels and putting pressure on dam walls which could eventually burst, flooding towns.
Hoover dam ppt
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how it was constructed and its project management, time management, cost management, and its tunnels and penstocks and so on.....
Impact of Large Dams on Climate
The document discusses the impacts of large dams on the environment and climate, using the Tehri Dam in Uttarakhand, India as a case study. It summarizes that the Tehri Dam provides benefits like hydroelectric power, flood control, irrigation, and tourism, but also resulted in mass displacement of people, deforestation, and impacts on biodiversity. Mitigation efforts were undertaken for afforestation, erosion control, and protecting displaced communities and the environment.
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Dams and water diversions can have both positive and negative ecological impacts. Positively, dams provide benefits like hydropower, irrigation, flood control and more. However, they can also harm wildlife such as disrupting fish migration and reducing sediments downstream. This impacts wetland species and water quality. Dams may also cause erosion of downstream areas and change water temperature, flow and salinity levels. Large dam projects have additionally displaced many people from their homes. Examples highlighted are the Hoover Dam on the Colorado River and the Aswan High Dam on the Nile River.
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Hoover Dam is a concrete arch-gravity dam on the Colorado River between Nevada and Arizona that was constructed between 1931-1936. It was built to provide flood control, irrigation water storage and hydroelectric power. Over 100 lives were lost during its construction due to extreme heat and dangerous working conditions. The dam impounds Lake Mead, the largest reservoir in the US. It continues to provide power to millions in the Southwest and is a major tourist attraction receiving nearly 1 million visitors annually.
Ecological impacts of dams and water diversions
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Effect of dam on biodiversity
constructing dams may create adverse environmental impacts, sometimes leads to decline of biodiversity.
Impact of Building Dam on River Ecosystem and Its Preventive Measures
The document discusses the environmental impacts of dam construction on river ecosystems. It states that dams can result in physical, chemical, and biological changes to ecosystems upstream, in the reservoir, and downstream. Specific impacts mentioned include blocking fish migration, changes in sediment flow, flooding of natural habitats, and species changes from altered flooding patterns. The document also provides a case study on the impacts of the Farakka Barrage on the Ganges River in Bangladesh, such as reduced sediment and water flows. It notes some proposed solutions like building additional reservoirs and canals. The conclusion discusses how dams have both benefits and detriments and calls for further studying impacts and improving engineering to reduce negative effects.
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This document discusses dams and their environmental and social impacts. It begins by defining dams and explaining their purposes, which include irrigation, flood control, hydropower, and navigation. It then describes the main types of dams and discusses their environmental performance, noting impacts on terrestrial and aquatic ecosystems from habitat loss and changes to natural flow regimes. Socially, dams can displace large populations and disrupt livelihoods when people are resettled or downstream access to resources is reduced. Planning for dams often undercounts affected people and resettlement efforts are frequently inadequate.
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- Multiple factors contribute to low dissolved oxygen in Hood Canal, including strong stratification that prevents mixing of deep waters, slow circulation, and high productivity that leads to decomposition of organic matter and oxygen depletion.
- Increasing human development in the area has elevated nutrient levels in Hood Canal waters, fueling more rapid algal growth and higher oxygen demand when this material decomposes.
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- The rapid increase in large dam construction during the 20th century, with over 45,000 large dams built globally by the end of the century.
- The main types of dams - embankment dams made of earth/rock fill and concrete dams made of mass concrete.
- The key benefits of dams including water supply, flood control, hydropower, irrigation, and recreation.
- Some costs associated with dams and the complex relationship between climate change and dams.
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This document provides an overview of dams in Ethiopia, including:
1) Ethiopia has significant water resources potential but development has been low, with less than 10% of irrigation and hydropower potential developed.
2) There are over 50 large dams existing in Ethiopia, which were built mainly for hydropower, irrigation, and water supply. However, many microdams experience problems like seepage, sedimentation, and structural failures.
3) Several large dams are under construction, including Gibe III, the largest, which will provide 1870 MW of hydropower once completed.
4) While dams provide benefits, they can also negatively impact the environment through issues like reservoir sedimentation reducing storage
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http://www.scenic.com/tours/hoover-dam-bus-tour | Learn the fascinating history of Hoover Dam and its construction. See why it is the most-visited dam in the world. Together with Lake Mead and the nearby Hoover Dam Bypass Bridge, it manages water flow from the mighty Colorado River into three surrounding states.
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Hoover Dam Bypass Technical Presentation
The document summarizes the need for and construction of the Hoover Dam Bypass Bridge. Traffic and security issues with the existing Hoover Dam route required a new solution. A multi-year process considered alternatives and resulted in the construction of a $240 million composite concrete arch bridge. The bridge opened in 2010 to relieve congestion and improve safety at the Hoover Dam.
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The document describes a virtual field trip to Hoover Dam, including taking an elevator 50 stories down in 6 seconds to see the large tunnels used to divert water during construction. It explains how water rushing through turbines inside the dam causes them to spin and generate electricity, powering Nevada and Southern California.
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Water on the land
This document discusses water on the land and how rivers change from their source to their mouth. It explains that rivers have a steep gradient and narrow channels near their source, carrying large angular material. Downstream, the gradient gentles, channels widen and deepen, and material transported is smaller and more rounded. Floodplains also become wider and flatter towards the river mouth as the channel capacity increases.
Methods Of Flood Control1274
There are several ways to manage and control flooding, including controlling water levels with dams and pumping stations, building barriers like embankments and levees, altering river channels by straightening or widening them, and controlling land use around rivers through zoning and afforestation. Hard management strategies involve large-scale engineering works like dams, levees, dredging, and channel alterations. Soft strategies work with nature and are more sustainable options like afforestation, flood plain zoning, and flood warning systems.
Managing Floods
The document discusses different methods for managing floods to reduce their impact, including both hard and soft engineering techniques. Hard engineering techniques like dams, embankments, and flood walls aim to control rivers through complicated engineering structures, while soft engineering works with natural river processes using methods such as washlands, land-use zoning, and afforestation. The effectiveness and sustainability of management schemes depends on factors like the land value, number of affected people, costs, and how well the schemes control flooding over the long run.
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Eight Tools of Watershed Protection
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Merri Creek Case Study
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On March 17, 2016 (St Patty's Day!) we convened a Gathering with 4 water agencies to talk about land stewardship, drought, and partnerships. More info over at: http://openspacecouncil.org/community-events/gatherings/
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Tim randle dam removal in the united states
The document discusses revitalization of rivers in the United States through dam removal. It provides background on the benefits and impacts of dams, and the history of dam construction and removal in the US. Over 750 dams have been removed, mostly small dams, to help restore rivers and ecosystems. Case studies are presented on dam removals on the Chiloquin River in Oregon, Rogue River in Oregon, and Elwha River in Washington to restore fish passage and ecosystems while managing sediment impacts.
Tim randle dam removal in the united states
The document discusses revitalization of rivers in the United States through dam removal. It provides background on the impacts of dams, history of dam construction and removal in the US. Specifically, it examines case studies of dam removals on the Chiloquin River in Oregon, Rogue River in Oregon, and Elwha River in Washington. For the Elwha River dams, the reservoirs contained major sediment problems that required concurrent dam removal and management of reservoir sediments to minimize downstream impacts.
How Can Flooding Be Managed
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3Week 4 iLab InstructionsSCI230iLab Title Groundwater P.docx
3
Week 4 iLab Instructions
SCI230
iLab Title: Groundwater Processes and Contamination
Scenario/Summary:
In either confined or unconfined aquifers, excessive extraction can deplete groundwater. Declines in the level of the Ogallala aquifer have become quite serious in some places, as seen in Figure 13.8a and c: High Plain Aquifer. If one person depletes the groundwater in their area, the drop in the water table may spread to other areas. How does water in an aquifer behave—more like water in a bathtub or more as if it is contained in an egg-carton-like configuration (see Figure 13.8b)? The bathtub analogy applies if the aquifer acts as a common pool, so a general lowering of the water table occurs when a person pumps the aquifer from one location. For the egg carton model, the aquifer is compartmentalized so a person pumping in one location does not influence neighboring areas.
Deliverables:
1. Read through the lab instructions document below before executing the lab steps and creating the report.
2. Refer to Owen, Earth Lab: Exploring the Earth Sciences, ISBN-13: 9780538737005, Lab 13: Groundwater and Karst Topography, Groundwater Depletion and Ground Water Contamination, pages 302–307.
3. Follow all procedures in the lab instructions for the items you will need to include in your report.
4. After executing all steps contained in the lab instructions, submit a single Word document containing your report to the Week 4 Dropbox.
Grading Rubric
Category
Points
Description
Questions 1a and 1b [See Figure 13.8: High Plains Aquifer, page 303]
15
The answers are complete and accurate. Interpretations of the results are included and correct.
Questions 2a–2c [See Figure 13.9: Ground Water Contamination, page 304, Figures 13.10: Water-Table Contours and 13.11: Groundwater Flows, page 305]
15
The answers are complete and accurate. Interpretations of the results are included and correct.
Total
30
A laboratory report will meet or exceed all of the above requirements.
iLab Steps
Step 1: High Plains Aquifer Depletion
Figure 13.8 (a) Map of the High Plains Aquifer showing changes in the water level between 1980 and 1995. The aquifer is also called the Ogallala Aquifer; its extent is outlined in black on the map, and its water-level changes are indicated with different colors. (b) Two models for how aquifers work. (Top) Aquifers may act like bathtubs, where draining from one part may drain the whole thing; or (bottom) in the egg-carton model, one person pumping does not affect neighbors’ water levels. Most aquifers are probably between these two extremes. (c) The same map area as in (a) but with water level change data up to 2005.
1a. Study the map in Figure 13.8a: High Plains Aquifer, page 303.
i. What do the blue and lavender colors indicate? The orange and red?
ii. Where was the aquifer most depleted? Where was the aquifer rising? Does the whole aquifer act like a bathtub? Why, or Why not?
iii. What problems can you envision for hous.
Duke Bitsko - Alewife Stormwater Wetland
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Presented at the Urban and Suburban Carbon Farming to Reverse Global Warming conference at Harvard University on May 3, 2015, organized by Biodiversity for a Livable Climate.
www.bio4climate.org
Healthy Coastal Ecosystems
Robert Twilley, vice chancellor of research, University of Louisiana at Lafayette. Sea Grant Week 2010
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Water is essential for life but its distribution and management poses challenges. Most water (97%) is saline and found in oceans, while only 3% is freshwater. Much of this is frozen in ice caps and glaciers, leaving less than 1% accessible for human use. Water scarcity varies globally, with some regions and countries having more than enough while others lack access to even basic supplies. Proper sanitation and water treatment are needed to provide safe drinking water and prevent water-borne diseases worldwide. Dams can support water storage and uses like hydroelectric power but also have environmental and social impacts requiring careful planning and management.
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