MATH IN THE NEWS
Issue 96
The California Drought
THE CALIFORNIA DROUGHT
 The year 2013 was the driest year on record since 1894,
and conditions have only continued to wor...
THE CALIFORNIA DROUGHT
Residents of California have had to restrict their water
usage as a way to conserve the limited am...
THE CALIFORNIA DROUGHT
Californians
have also
suffered from
record wildfires
due to the
extremely arid
conditions. (The
A...
THE CALIFORNIA DROUGHT
 The effects of the drought reach throughout
the United States, as we rely on California
agricultu...
THE CALIFORNIA DROUGHT
This map shows the
severity of the
drought throughout
the state of
California.
(Source: United Stat...
THE CALIFORNIA DROUGHT
This table shows conditions throughout 2013. Conditions have
been consistently dry, but the severit...
THE CALIFORNIA DROUGHT
Water is stored in reservoirs.
Current water levels are
shown in the map. The
measurements are in a...
THE CALIFORNIA DROUGHT
With this information, we can
assess the differences between
current water levels and average
water...
THE CALIFORNIA DROUGHT
Transfer information from the map to a chart.
Name of Reservoir
Capacity
(acre-feet)
Average percen...
THE CALIFORNIA DROUGHT
What is the average amount of
acre-feet of water in each
reservoir at this time of year?
THE CALIFORNIA DROUGHT
THE CALIFORNIA DROUGHT
Name of Reservoir
Capacity
(in acre-feet)
Average percent
filled
Average acre-feet
filled
Trinity L...
THE CALIFORNIA DROUGHT
How many acre-feet of water are
currently in the reservoirs?
THE CALIFORNIA DROUGHT
THE CALIFORNIA DROUGHT
Name of
Reservoir
Capacity (in
acre-feet)
Average
percent filled
Average acre-
feet filled
Current ...
THE CALIFORNIA DROUGHT
How many fewer acre-feet of water are in each
reservoir than expected (average)? Let’s look at
Trin...
THE CALIFORNIA DROUGHT
What percent of expected water levels is currently
filled?
The water levels in the Trinity Lake res...
THE CALIFORNIA DROUGHT
 Continue exploring the changes in water levels by
answering the following questions:
 How many f...
Upcoming SlideShare
Loading in …5
×

Math in the News: Issue 96

545 views

Published on

In this issue of Math in the News we look at the ongoing drought in California. In the process we look at the percent change in the current level of water in reservoirs relative to the average level.

Published in: Education
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
545
On SlideShare
0
From Embeds
0
Number of Embeds
23
Actions
Shares
0
Downloads
6
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide
  • Photo credit Reuters/ibtimes http://www.ibtimes.com/current-california-drought-driest-states-history-scientists-fear-megadroughts-their-way-1548912
  • Photo credit AP, information sources from The Guardian, “California drought is ready for a Silicon Valley moment – and futuristic farms,” Mar. 25, 2014, http://www.theguardian.com/commentisfree/2014/mar/25/california-drought-silicon-valley-moment
  • The Atlantic Cities, Place Matters. California's Drought: More Wildfires, Higher Food Prices, March 21,2014. Retrieved from http://www.theatlanticcities.com/jobs-and-economy/2014/03/no-relief-sight-drought-ravished-california/8696/.
  • The Guardian, “California drought is ready for a Silicon Valley moment – and futuristic farms,” Mar. 25, 2014, http://www.theguardian.com/commentisfree/2014/mar/25/california-drought-silicon-valley-moment. Strawberry image - http://www.strawberry-plants.com/about-us.htm,
  • http://droughtmonitor.unl.edu/Home/StateDroughtMonitor.aspx?CA
  • http://droughtmonitor.unl.edu/Home/StateDroughtMonitor.aspx?CA
  • http://cdec.water.ca.gov/cdecapp/resapp/getResGraphsMain.action
  • Math in the News: Issue 96

    1. 1. MATH IN THE NEWS Issue 96 The California Drought
    2. 2. THE CALIFORNIA DROUGHT  The year 2013 was the driest year on record since 1894, and conditions have only continued to worsen in 2014. This follows several years of dry winters in California, raising concerns about overall water trends.
    3. 3. THE CALIFORNIA DROUGHT Residents of California have had to restrict their water usage as a way to conserve the limited amount of water available. People have been advised to limit watering plants and grass, and be mindful of water usage in daily tasks (brushing teeth, taking showers, and doing laundry). (SaveOurH20, www.saveourh2o.org)
    4. 4. THE CALIFORNIA DROUGHT Californians have also suffered from record wildfires due to the extremely arid conditions. (The Atlantic)
    5. 5. THE CALIFORNIA DROUGHT  The effects of the drought reach throughout the United States, as we rely on California agriculture for almost half of the nation’s supply of fruits, vegetables, and nuts.
    6. 6. THE CALIFORNIA DROUGHT This map shows the severity of the drought throughout the state of California. (Source: United States Drought Monitor)
    7. 7. THE CALIFORNIA DROUGHT This table shows conditions throughout 2013. Conditions have been consistently dry, but the severity has been increasing. (Source, United States Drought Monitor)
    8. 8. THE CALIFORNIA DROUGHT Water is stored in reservoirs. Current water levels are shown in the map. The measurements are in acre- feet, a unit of volume equal to the volume of a sheet of water one acre in area and one foot in depth. Source: California Department of Water Resources
    9. 9. THE CALIFORNIA DROUGHT With this information, we can assess the differences between current water levels and average water levels, and current water levels and capacity.
    10. 10. THE CALIFORNIA DROUGHT Transfer information from the map to a chart. Name of Reservoir Capacity (acre-feet) Average percent filled Current percent filled Trinity Lake 2,447,650 68% 53% Lake Shasta 4,552,000 58% 46% Lake Oroville 3,537,577 61% 46% New Melones 2,400,000 69% 43% Folsom Lake 975,000 67% 42% San Luis 2,041,000 47% 42% Don Pedro 2,030,000 73% 53% Millerton Lake 520,500 46% 32% Pyramid Lake 180,000 103% 94% Castaic Lake 325,000 94% 84% Exchequer 1,032,000 42% 23% Pine Flat 1,000,000 39% 22% Note how great the difference is between this year and the average!
    11. 11. THE CALIFORNIA DROUGHT What is the average amount of acre-feet of water in each reservoir at this time of year?
    12. 12. THE CALIFORNIA DROUGHT
    13. 13. THE CALIFORNIA DROUGHT Name of Reservoir Capacity (in acre-feet) Average percent filled Average acre-feet filled Trinity Lake 2,447,650 68% 1,664,402 Lake Shasta 4,552,000 58% 2,640,160 Lake Oroville 3,537,577 61% 2,157,921.97 New Melones 2,400,000 69% 1,656,000 Folsom Lake 975,000 67% 653,250 San Luis 2,041,000 47% 959,270 Don Pedro 2,030,000 73% 1,481,900 Millerton Lake 520,500 46% 239,430 Pyramid Lake 180,000 103% 185,400 Castaic Lake 325,000 94% 305,500 Exchequer 1,032,000 42% 433,440 Pine Flat 1,000,000 39% 390,000 Ex: 1,000,000 x (0.39) = 390,000
    14. 14. THE CALIFORNIA DROUGHT How many acre-feet of water are currently in the reservoirs?
    15. 15. THE CALIFORNIA DROUGHT
    16. 16. THE CALIFORNIA DROUGHT Name of Reservoir Capacity (in acre-feet) Average percent filled Average acre- feet filled Current percent filled Current acre- feet filled Trinity Lake 2,447,650 68% 1,664,402 53% 1,297,254.50 Lake Shasta 4,552,000 58% 2,640,160 46% 2,640,160 Lake Oroville 3,537,577 61% 2,157,921.97 46% 2,157,921.97 New Melones 2,400,000 69% 1,656,000 43% 1,032,000 Folsom Lake 975,000 67% 653,250 42% 409,500 San Luis 2,041,000 47% 959,270 42% 857,220 Don Pedro 2,030,000 73% 1,481,900 53% 1,075,900 Millerton Lake 520,500 46% 239,430 32% 166,560 Pyramid Lake 180,000 103% 185,400 94% 173,900 Castaic Lake 325,000 94% 305,500 84% 273,000 Exchequer 1,032,000 42% 433,440 23% 237,360 Pine Flat 1,000,000 39% 390,000 22% 220,000 1,000,000 x (0.22) = 220,000
    17. 17. THE CALIFORNIA DROUGHT How many fewer acre-feet of water are in each reservoir than expected (average)? Let’s look at Trinity Lake. There are 367,147.50 fewer acre-feet of water than the average.
    18. 18. THE CALIFORNIA DROUGHT What percent of expected water levels is currently filled? The water levels in the Trinity Lake reservoir are 77.9% what is expected at this time of year.
    19. 19. THE CALIFORNIA DROUGHT  Continue exploring the changes in water levels by answering the following questions:  How many fewer acre-feet of water are in the rest of the reservoirs?  What percent of the expected water levels in the reservoirs is currently filled?  How many more acre-feet of water, total, are expected at this time of year compared with actual current acre-feet of water?  Investigate how the water is allocated and the effects the shortage in water resources has on the state of California and on the United States.

    ×