Transcript Water Use and Management

Chapter 11-2
 A shortage of clean,
fresh water is one of
the world’s biggest
environmental
problems
 More than 1 billion
people lack access to
clean fresh water
 Average water use per
person in US – 80 gallons
a day (300 L)
 ½ is used for residential
use
 India - 11.8 gallons(41 L)
 Potable – water that is
made safe to drink
 Pathogens – organisms
that cause illness or
disease
 Bacteria, viruses,
protozoa, and parasitic
worms
 Water with feces
 Industry - 19% of water
used in the world
 Manufacture goods
 Dispose of waste
 Generate power
 132,000 gallons of water
are needed to
manufacture a car
 80 gal to produce an ear
of corn
 Agriculture - 67% of
water used in world
 80% of water evaporates
before it reaches the
roots
 Irrigation – method for
providing plants with
water other than
precipitation
 Early irrigation –
flooding of fields
 Owens River in
California
 Colorado River
 Dam – structure built to
control a river’s flow
 Built for electrical
energy
 Reservoir – artificial lake
that is formed behind a
dam
 Flowing water turns
turbine
 Turbine generates
electricity
 Displacement of
ecosystems
 Blocks fertile sediments
from reaching down
stream
 Bursting dams
3 Dam Clips
 Agriculture
 Most lost through
Evaporation
 Run-off
 Seepage
 Drip irrigation System
 Releases water at a
controlled rate
 Directly to roots
 Industry
 Recycling of cooling and
waste water
 Some cities pay small
business to conserve
 Home
 Low-flow toilets and
showers
 1/3 of water used is for
landscaping
 Water at night
 Xeriscaping – designing
landscape that uses
minimal water
 Desalination – process of
removing salt from ocean
water
 Heat salt water and
collect evaporated water
 Expensive
 Almost ½ of water in
U.S. is in Alaska
 Talks of hauling water to
dry areas
 77% of Earth’s freshwater
is found in ice
 Transporting ice?
Desalination Clip