Chp Water & Water Pollution RAD Guide August 8, 2015August 8, 2015August 8, 2015

Chp 20: Water Uses Explain how natural disasters can leave communities w/o fresh H 2 O. Earthquakes destroy pipes, floods mix sewage with fresh water Earthquakes destroy pipes, floods mix sewage with fresh water Unpotable: water that is unsafe to drink Unpotable: water that is unsafe to drinkvs. Potable- water that is safe to drink

How many liters of H 2 O does the average person in US use daily? 300 L 300 L

How much of H 2 O that’s used by people does industry use? How does lack of H 2 O affect industry? 44% 44% Availability of water affects where a company can relocate  generates jobs in community it chooses Availability of water affects where a company can relocate  generates jobs in community it chooses

How much of H 2 O people use does agriculture use? Define irrigation. 47% 47% Irrigation: process of bringing water to an area for use in growing crops Irrigation: process of bringing water to an area for use in growing crops

Describe the 4 types of irrigation. 1. F lood irrigation: flooding of area that is flat 2. F urrow irrigation: releases H2O into furrows dug b/w rows of crops 3. O verhead irrigation: use sprinkler system over tops of crops Efficient, but expensive 4. S ubirrigation: water introduced naturally or artificially beneath soil

Furrow irrigation Flood irrigation Overhead irrigation-sprinklers sub irrigation

Describe what happened in Mono Lake, CA. Saltwater lake fed by melting snow from mountains Saltwater lake fed by melting snow from mountains City diverted the melt  less water to lake  evaporation  increase salt  kill animals City diverted the melt  less water to lake  evaporation  increase salt  kill animals

Describe how surface H 2 O can turn into larger stream and oceans. Water from rain and melting snow travels as runoff Water from rain and melting snow travels as runoff Runoff carves grooves into land called rills Runoff carves grooves into land called rills Rills deepen to form larger streams Rills deepen to form larger streams Deposit into oceans Deposit into oceans

Describe how groundwater is formed. Water seeps through soil and into porous bedrock Water seeps through soil and into porous bedrock Groundwater collects in rock to form a layer = water table Groundwater collects in rock to form a layer = water table

What is an aquifer? How does H 2 O move through it? Aquifer: layer of porous rock that contains water Aquifer: layer of porous rock that contains water Water does not move at constant rate Water does not move at constant rate

What is overdraft? Name 2 problems with overdraft. Overdraft: when a body of water is drained faster than it is filled Overdraft: when a body of water is drained faster than it is filled 1. Saltwater Intrusion: saltwater mixes with aquifer  makes unpotable 2. Subsidence: water supports bedrock, so when removed, rock weakens and sinks W4niTkVck8https:// W4niTkVck8 (FLORIDA MAN SWALLOWED BY SINKHOLE) W4niTkVck8

Subsidence example

Briefly mention what happened to Ogallala Aquifer. Largest aquifer in the world Largest aquifer in the world High plains states depend heavily on aquifer for irrigation of crops High plains states depend heavily on aquifer for irrigation of crops Predicted to dry up in 40 years because of overdraft Predicted to dry up in 40 years because of overdraft om/watch?v=XXFsS94H F08 (Ogallala Aquifer) om/watch?v=XXFsS94H F08 (Ogallala Aquifer) om/watch?v=XXFsS94H F08 om/watch?v=XXFsS94H F08

What is desalination & what can it be used for? Desalination: process by which salts are removed from water Desalination: process by which salts are removed from water Obtain fresh water for cooking, drinking, irrigation, and removes salt from agriculture waste water Obtain fresh water for cooking, drinking, irrigation, and removes salt from agriculture waste water

Explain 3 types of desalination. 1. Distillation: water evaporates, salt left behind

3 types of desalination (continued) 2. Reverse Osmosis: saltwater forced through strainer that traps salt through strainer that traps salt 3. Freezing: forms ice and salt slush Slush removed leaving fresh iceSlush removed leaving fresh ice

What are 4 processes that are used to purify water? 1. S edimentation 2. F iltration 3. A eration 4. S terilization

Briefly describe process of water treatment. 1. Screens trap floating particles 2. Water allowed to stand undisturbed so sediment settles at bottom 3. Coagulants remove fine particles 4. Filter through fine sand 5. Air sprayed on it or falls as waterfall (O 2 purifies water) 6. Sterilize using chemicals or extreme heat

What are 2 substances used to purify water? What are benefits & disadvantages? Chlorine Chlorine –Produced and stored easily –Adds smell to water Ozone Ozone –Sterilizes more quickly –Expensive and difficult to store

Chp 21: Water Pollution Briefly describe the history of water pollution. 19 th century: most of world dumped garbage into closest waterway 19 th century: most of world dumped garbage into closest waterway –Led to cholera, typhoid fever, dysentery Then moved to ocean dumping Then moved to ocean dumping –Still a common practice

What is sewage? How much is dumped in ocean by US? Sewage: water that contains organic wastes from humans and industry Sewage: water that contains organic wastes from humans and industry 8.9 trillion liters each year!! 8.9 trillion liters each year!!

What is sewage-treatment plant? Explain how sewage is treated. Facility that processes raw sewage before sewage is returned to surface water systems Facility that processes raw sewage before sewage is returned to surface water systems 1. Filter through screens (big particles) 2. Add bacteria and chemicals Breakdown organic materialBreakdown organic material SterlizeSterlize

How are diseases & water pollution related? What is a pathogen? Many disease carrying organisms spend part of life cycle in water Many disease carrying organisms spend part of life cycle in water Pathogen: parasites, bacteria, & viruses that cause disease Pathogen: parasites, bacteria, & viruses that cause disease –Typhoid fever –Cholera –Schistosomiasis –Malaria

What are 6 major sources of water pollution? 1. Agriculture 2. Sewage-treatment plant 3. Industry 4. Urban runoff 5. Mining runoff 6. Construction runoff

What are 4 types of water pollutants? 1. P athogens 2. N utrients 3. S ediments 4. T oxic Chemicals

Why is agriculture such a major pollutant? Use of pesticides, fertilizers, plant & animal waste all pollute land and water Use of pesticides, fertilizers, plant & animal waste all pollute land and water

Define toxic chemicals. What is difference b/w inorganic & organic? Toxic chemicals: elements and compounds that are directly harmful to living things Toxic chemicals: elements and compounds that are directly harmful to living things –Inorganic: lack carbon –Organic: contain carbon

Identify & describe 4 types of inorganic chemicals. 1. Acids: runoff from mining, chemical plants, water-treatment facilities, etc. 2. Salts: runoff from mining, treatment, plants, direct discharge 3. Heavy metals: industrial processes (metal treatment, paint) ex. Mercury & lead 4. Plant nutrients: phosphates & nitrates from agriculture

Identify 6 examples of organic chemicals. How do they enter groundwater? Gasoline, oils, plastics, pesticides/fertilizers, solvents, wood preservative Gasoline, oils, plastics, pesticides/fertilizers, solvents, wood preservative Discharged into sewer systems that lead to lakes Discharged into sewer systems that lead to lakes Runoff Runoff

Why is crude oil the most common spill? Because transported along rivers & across oceans in huge amounts Because transported along rivers & across oceans in huge amounts Exxon Valdez: 1989 & Amoco Cadiz: 1978 Exxon Valdez: 1989 & Amoco Cadiz: 1978

Explain the process of eutrophication. Large amounts of plant nutrients runoff into lake Large amounts of plant nutrients runoff into lake Accelerates plant growth  no room Accelerates plant growth  no room Plants die & decompose  increases # decomposer bacteria Plants die & decompose  increases # decomposer bacteria Lowers oxygen Lowers oxygen Animals die Animals die

Describe problems associated with radioactive water pollution. Waste difficult to store (solid & liquid) Waste difficult to store (solid & liquid) Liquid waste placed in steel containers and encased in concrete Liquid waste placed in steel containers and encased in concrete Can corrode over time and leak in ground water systems Can corrode over time and leak in ground water systems

Usually occurs in lakes by power plants Usually occurs in lakes by power plants Fish regulate body temp by water temp Fish regulate body temp by water temp Increase water temp  increase metabolism in fish, but decreases amount of oxygen in water Increase water temp  increase metabolism in fish, but decreases amount of oxygen in water Fish suffocate Fish suffocate Describe problems associated with thermal water pollution.

Why have laws to protect the water from pollution failed? 1. Laws not strong enough 2. Strong ones not enforced 3. Scientific reports not accurate 4. Difficult to determine who did polluting 5. Removal of factory can cause loss of jobs