Chapter 15: Freshwater Resources Natural System, Human Impact and Conservation .
Freshwater Resources Natural Systems, Human Impact, and Conservation.
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Transcript of Freshwater Resources Natural Systems, Human Impact, and Conservation.
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Freshwater ResourcesNatural Systems, Human Impact, and Conservation
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Freshwater Systems•Fresh water – water that is relatively
pure, with few dissolved saltsAll water
2.5 % Fresh Water
97.5% Oceans
Fresh Water
1% Surface Fresh water
20 % Groundwater
79% Ice Caps & Glaciers
Surface Fresh Water
1% Water within organisms
1% Rivers
8% Atmospheric Water Vapor
38% Soil Moisture
52% Lakes
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Uses of WaterAgricultural Domestic Industrial
Irrigation Bathing Washing
Water for Livestock Laundry Diluting
Consumption/Cooking
Cooling
Landscaping
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Hydrologic Cycle
•Water is constantly moving among reservoirs.
•It redistributes heat, erodes mountain ranges, builds rivers deltas, maintains organisms & ecosystems, shapes civilizations.
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Rivers & Streams wind through landscapes•Rain, snowmelt, springs run downhill &
converge forming streams, creeks, brooks merge into rivers
•Tributary – smaller river flowing into a larger one
•Watershed – Area of land drained by a river and all its tributaries.
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Rivers
•Shape the landscape
•Erode Soil from the bank
•May shift from one course to another,
creating floodplains
•Hosts diverse ecological communities
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Watershed
• Region of land that contributes water to a stream, river, pond, lake, or ocean
• Watershed Divide: Boundary that divides one watershed from another.
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• Every land area is part of a watershed
• Depend on geology of region.
• Vegetation types of plants determine how much & how quickly water runs.
Watershed Characteristics
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Runoff
•Keep rivers and lakes full of water, but also changes the landscape.
Meteorological factors Physical characteristics
Type of precipitation Land Use
Rainfall intensity Vegetation
Rainfall amount Soil Type
Rainfall duration Drainage Area
Distribution of rainfall over the watersheds
Elevation
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Watersheds Change Over Time
•Land use changes must be monitored, urban, agricultural, industry, transportation systems, & public lands.
•Monitoring areas susceptible to flooding
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Stream flow Measurements Indicate Change •Measure the amount of water (volume)
that flows past a certain point over time (velocity).
•Influenced by soil conditions, vegetative coverings , human population, wetlands, forests, urban settings.
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Chicago Over Time…….
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Mississippi Watershed
•40 % of 48 states (made of smaller watersheds)
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Chicago River
• How Healthy is the Chicago River Watershed?
1. Diversity (plant & organisms)2. Any pollutants?3. Invasive Species?
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What Makes A River Healthy?
•Flow
•Water Quality
•Habitat
•Food Energy
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What are the problems facing the Chicago River Today?
•Loss of Biodiversity/habitat•Toxins in the water and sediment•Excess Nutrients•Excess fecal coliform bacteria•Excess Erosion•Presence of Dams•Lack of public awareness and action
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Water Quality Testing
•Oxygen•pH•Temperature•Phosphates•Nitrates•Turbidity & Total Solids•Fecal Coliform•Aquatic Macroinvertebrates•Habitat
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Today….•Reflection Sheet Due Turn it in!
•Finish Colorado River Case Study – pg. 388 (15 min)
•Watershed Movie: A New Ethic
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How We Use Water
•Consumptive use – remove water from an aquifer or surface water body and do not return it.
•Nonconsumptive use – does not remove water, or temporarily removes water
Industry Agriculture Domestic
United States 46% 41% 13%
India 6% 87% 8%
Lithuania 16% 7% 78%
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Dams & The Environment
•Any obstruction placed in a river or stream to block the flow of water so that water can be stored in a reservoir.
•Prevent floods, provide drinking water, facilitate irrigation, and generate electricity.
•More than 45,000 have been erected!
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Major Benefits & Costs of DamsBenefits Costs
Power Generation Habitat alteration
Emission reduction Fisheries Decline
Crop Irrigation Population displacement
Drinking Water Sediment Capture
Flood Control Disruption of Flooding
Shipping Risk of Failure
New Recreational Opportunities
Lost Recreational Opportunities
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Some dams are being removed
•Restore ecosystems, reestablish economically valuable fisheries, and revive river recreation.
•500 dams have been removed in the US
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Dikes & Levees are meant to control floods
•Flooding is a natural process due to snowmelt or heavy rain, spread nutrient-rich sediments over large areas.
•Short term damage farms, homes, and other property
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Canals
•Water from upstream reservoirs are routed downstream by the use of canals
•Hazardous to people and animals
•Lead to serious unanticipated environmental problems
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Channelization & the Environment•Straightening, deepening, widening,
clearing, or lining existing stream channels.
•Control floods, improve drainage, control erosion, and improve navigation.
•Degradation of hydrologic qualities, removal of vegetation, downstream flooding, aesthetic degradation.
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Wetlands include marshes, swamps, and bogs
•Enormously rich and productive
•Valuable as a habitat for wildlife
•Slow runoff, reduce flooding, recharge aquifers
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Lakes and Ponds are ecologically diverse systems
•Bodies of standing water
•Vary with depth and distance from shore
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Littoral Zone
•Edge of body of water, shallow
•Aquatic plants grow from the mud
•Rich in invertebrates, insect larvae, snails, crayfish
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Benthic Zone
•Extends along the bottom of the entire water body
•Invertebrates live in the mud, feed on detritus or on one another
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Limnetic Zone
•Open portion, away from shore
•Sunlight intensity decreases with depth
•Photosynthetic organisms thrive
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Profundal Zone
•Sunlight Does not Reach
•Lower is dissolved oxygen, supports fewer animals
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Groundwater
•Any precipitation that does not evaporate, flow into waterways, or get taken up by organisms.
•Aquifers: porous, spongelike formations of rock, sand or gravel that hold water.
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2 Broad Categories • Confined Aquifer –
water bearing porous layer of rock, sand, or gravel that is trapped between layers
• Unconfined Aquifer – no upper layer, water is under less pressure and can be readily recharged by surface water
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We are depleting groundwater
•Aquifers recharge slowly, groundwater becomes more difficult and expensive to extract.
•Lose water, become weaker and less capable of supporting land surface.
•Sinkholes grounds gives way with little warning.
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Chicago Sinkhole 4/18/13
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Fresh Water Pollution & Its Control
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Pollution
•The release of matter or energy into the environment that causes undesirable impacts on the health and well-being of humans or other organisms.
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Water Pollution Takes Many Forms•Nutrient Pollution
•Pathogens and Waterborne diseases
•Toxic Chemicals
•Sediment
•Thermal Pollution
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Water Pollution
•Point Sources Discrete locations, factory or sewer pipe
•Non Point Source Multiple cumulative inputs over larger areas
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Groundwater Pollution
•Serious Problem, more difficult to manage
•Less dissolved oxygen, microbes, minerals, and organic matter
•Many sources of pollution
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Wastewater and Its Treatment
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We treat our drinking water
•Mainstream practices due to advances in technology
•Regulated by the EPA
•Chemicals, passed through filters of sand, gravel, and charcoal, and or disinfected with chlorine.
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Wastewater
•Water that has been used by people in some way
•Carrying water sewage, water from showers, sinks, washing machines, dishwashers, water used in manufacturing, stormwater runoff.
•Harm ecosystems, and pose threats to human health
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Wastewater Treatment
•Involves steps
•Septic Systems: Water runs from the house to an underground tank, solids and oils separate from water
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Primary Treatment
•Physical removal of contamination in settling tanks or clarifiers
•Removes 60% of suspended solids
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Secondary Treatment
•Water is stirred and aerated so that aerobic bacteria degrade organic pollutants.
•90% of suspended solids may be removed
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