Water Usage & Drought in Austin

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Presentation transcript:

Water Usage & Drought in Austin Meghan Bock November 17, 2016

Overview Historical drought and precipitation trends in Austin Impact of Drought on Residential Water Usage Analysis of Austin Water Usage Data Time Elapse of Drought Conditions & Water Usage Average GPCD for January, 2012-2014 Average GPCD for July, 2012-2014 Further Analysis

Historical Drought & Precipitation Trends History of severe, long-lasting periods of drought August 2008 to April 2009: 37 weeks straight of extreme/exceptional drought April 2011 to January 2012: 41 weeks straight of extreme/exceptional drought 2008/2009 drought lasted over a year (68 weeks at nearly 100% D2+ After 2008/2009 drought, Austin remained out of drought conditions for nearly an entire year 2011 drought picked up in late March 2011 Didn’t let up until November 2013, but continued to persist under abnormally dry conditions until January 2015

Impact of Drought on Residential Water Usage Residential water use patterns tend to reflect increased consumption during periods of reduced rainfall These patterns are often the result of increased rates of outdoor irrigation Rate at which water consumption fluctuates varies in response to reduced rainfall Opposite behavior during periods of increased rainfall Must also consider average temperatures

Analysis of Austin Water Usage Data Based on monthly water consumption data for the residential sector (single family & multi-family) by zip code Determined average gallons per capita per day using population data from the US Census Bureau Some zip codes excluded from analysis Opposite behavior during periods of increased rainfall

Time Elapse of Drought Conditions & Water Usage (January 2012 through December 2014) Opposite behavior during periods of increased rainfall

Average GPCD for January, 2012-2014 Over the 3-year period, average water consumption was higher in 2013, which saw greater rainfall, but usage decreased in response to drought-like conditions in 2014 Since this for January, likely less outdoor irrigation demands Opposite behavior during periods of increased rainfall 5-year Rainfall Average

Average GPCD for July, 2012-2014 Over the 3-year period, average water consumption was higher in 2012 despite moderate rainfall and continued to decrease as precipitation levels stayed above average What other factors could be influencing residential water usage? Opposite behavior during periods of increased rainfall

Further Analysis Median Home Value (2012) Evaluate other factors that could be contributing to residential water use patterns, including median home value and average lot size Average GPCD (November 2012) Average Lot Size Opposite behavior during periods of increased rainfall