AIM: To describe ways in which people use water and relate how

water affects ecosystems.

Do Now: Describe how your life would be different if we did not

have clean water.

HW: Article #3 due Friday

Potable WaterWater that is SAFE to

drink

• Water Facts

Natural Disasters• Can lead to

unpotable water• Ex:

– Floods: mix sewage and sediments

– Earthquakes: destroy piplelines

Residential Use of water• Average person uses 300L

/day• Most is used for personal

hygiene and cleaning• Very little is used for

drinking and cooking• Other uses:

– Gardening, landscaping, car washing, lawn sprinkler (40L/minute)

Industrial Use• 44% is used for

industry

• Transport goods, dispose of wastes, power source, coolant

Agricultural Use

• 47% of water is used for agriculture- largest user of water

• Uses 5X more than an average household

• Irrigation– Bringing water into

an area for use in growing crops

Types of Irrigation

1. Flood Irrigation

2. Furrow Irrigation

3. Overhead Irrigation

4. Sub irrigation

Flood Irrigation• Flooding a large,

flat area of land• Inexpensive• Wasteful-

– a lot of water is soaked into the soil without plants

• 50% is lost to evaporation

Furrow Irrigation• Releases water

into furrows (ditches)

• Water deposited closer to plants

• Some lost to evaporation

Overhead Irrigation

• Sprinkler systems

• Efficiency decreases if its windy

• Drip Irrigation

– Tubing delivers water directly to roots

– Expensive

Sub Irrigation

• Water is introduced below the soil

• Need and underground water source

• Most efficient- reduces evaporation

Effects of Water on Ecosystems• Building dams• Draining swamps• Changing stream courses• Mono Lake (saltwater lake)

– Fed by runoff of melting snow and ice– Many waterfowl live there– 1940’s- LA diverted runoff to other areas,

water level dropped, salinity (salt) increased, led to a decrease in organisms

1. Why should freshwater be used sparingly?

2. How much water is used by the average person in the United States?

3. What are some industrial uses of water?

4. For what purpose is most of the freshwater in the United States used?

5. What are the advantages and disadvantages of two common methods of irrigation?

6. What are some effects of water use of ecosystems?

1. Because its availability is limited.2. 300L/day3. Transport goods, dispose of wastes, generate

power, coolant4. Agricultural- irrigation5. Flood- inexpensive and wasteful

Furrow- more efficient, wastefuloverhead- efficient, less if windy, drip (very efficient, expensive)sub- very efficient, need and underground water source

6. Destroy or change habitats of other living things