CALIFORNIA WATER TRENDS ELLYN WEIMER INTRO TO ARCGIS

CALIFORNIA WATER TRENDS ELLYN WEIMER INTRO TO ARCGIS, UNIVERSITY OF TEXAS AT AUSTIN NOVEMBER 29, 2016

CALIFORNIA- BACKGROUND o MOST POPULOUS STATE IN THE UNITED STATES o TODAY: ABOUT 39 MILLION PEOPLE o HOST OF A LARGE AMOUNT OF WATER INTENSIVE AGRICULTURE o I. E. NUTS (ALMONDS, WALNUTS), FRUITS (GRAPES, ORANGES), AND DAIRY o HEAVILY HIT BY DROUGHT, ESPECIALLY IN RECENT YEARS (2011 -CURRENT) o BUT ALSO HARD HIT ON AND OFF SINCE THE EARLY 1900’S. HOW DOES THIS AFFECT WATER USAGE?

WATER TRENDS: TOTAL WATER USAGE Total Water Use (Mgal/d) Total Water Use Trend Over the Years 60000 50000 40000 30000 20000 10000 0 1985 1990 1995 2000 2005 2010 2015 Year USGS Water-Use Data (by county) Areas of water use include: -Public -Domestic -Industrial -Thermoelectric -Mining -Irrigation -Livestock

WATER TRENDS: POPULATION Avg Water Use person (Gal/d) Average Water Use per Person (Gal/d) 300 250 200 150 100 50 0 1985 1990 1995 2000 Year 2005 2010 2015

Avg water use per acre (Gal/d) WATER TRENDS: AGRICULTURE Average Water Use per Acre (Gal/d) 4000 3500 3000 2500 2000 1500 1000 500 0 1985 1990 1995 2000 Year 2005 2010 2015

WATER TRENDS: POPULATION V AGRICULTURE Percent of Total Water Use: Year % Agr. (avg) % Pop (avg) 1990 0. 64 0. 22 2000 0. 65 0. 21 2010 0. 6 0. 39

FUTURE TRENDS Total Water Use Trend Over the Years California wants 25% Urban water use reduction: 60000 Total Water Use (Mgal/d) 50000 Assuming population was only thing changing: 40000 30000 water use 25% Urban Reduction 20000 25% reduction leads to ~2700 Mgal/d less used 10000 0 1985 shown with and without 25% urban water use reduction 1990 1995 2000 2005 Year 2010 2015 2020 2025

CONCLUSIONS AND LIMITATIONS o HARD TO PREDICT WATER TRENDS TODAY WHEN DON’T HAVE 2015 WATER USE DATA, ESPECIALLY WATER USE TRENDS THROUGHOUT DROUGHT FROM 2011 TO CURRENT. o WATER AVAILABILITY AFFECTS WATER USAGE RATES o POPULATION AND AGRICULTURE HAVE LARGE IMPACT ON WATER USAGE RATES, BUT NOT THE ENTIRE STORY

QUESTIONS?