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Water consumption snapshot : Green College Ward, Daniel Oct 10, 2014

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 UBC Social Ecological Economic Development Studies (SEEDS) Student ReportDaniel WardWater ConsumptionSnapshot: Green CollegePLAN 597October 10, 201411451682University of British Columbia Disclaimer: “UBC SEEDS provides students with the opportunity to share the findings of their studies, as well as their opinions, conclusions and recommendations with the UBC community. The reader should bear in mind that this is a student project/report and is not an official document of UBC. Furthermore readers should bear in mind that these reports may not reflect the current status of activities at UBC. We urge you to contact the research persons mentioned in a report or the SEEDS Coordinator about the current status of the subject matter of a project/report”.  DANIEL WARD                   PLAN 597. GREEN COLLEGE (#221)           PROF. HONEY-ROSÉS  OCTOBER 10THWater Consumption Snapshot: Green College Source: Green College, UBC website. I. Summary 	 Green College is an interdisciplinary graduate residence located north of  Chancellor Boulevard and east of  the Museum of  Anthropology. This profile examines water meter readings obtained through UBC Energy and Waster Services from January 2011-September 2014. 	 Good to know !"1ASSIGNMENT #1• Green College houses approximately 100 graduate students and researchers. • Since September 2011, after a change in the residency contract, vacancy rates have been relatively stable throughout the year. • Summer 2013: Replacement of  approximately 60% of  suite shower heads and toilets (low-flow) • Summer 2014: Replacement of  approximately remaining 40% of  suite shower heads and toilets.DANIEL WARD                   PLAN 597. GREEN COLLEGE (#221)           PROF. HONEY-ROSÉS  OCTOBER 10THII. Data Analysis !	 	 	 	 Table 1: Summary Statistics for 53 months:  	 	 	 	      January 2010-September 2014  !!!!!Count 51Mean 1246.33Variance 419716.45Standard deviation 647.85"2ASSIGNMENT #1Figure 2: Histogram. Monthly Water Consumption0369121518800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800Cubic Meters (M3)DANIEL WARD                   PLAN 597. GREEN COLLEGE (#221)           PROF. HONEY-ROSÉS  OCTOBER 10TH!!1. Water Consumption Over time 	 Figure 2 illustrates consumption at Green College over the last four years. This chart notes the initial installation of  low-flow technologies (shower-heads and toilets) in the summer of 2013, and the final completion of  this renovation the next summer. Figure 2 gives provides wide lens and shows minor reductions in water consumption over the last four years. Unsurprisingly, consumption fluctuates seasonally, with September-November and March-May being the highest periods of  use (summer time spikes between June-July are result of  those readings being grouped together due to missing June readings). Summer and the Winter Holiday period are low usage periods. However, December 2011 stands out clearly as an outlier, skewing the results higher in this typically low usage month.  	  !!"3ASSIGNMENT #1Figure 20444.444888.8891333.3331777.7782222.2222666.6673111.1113555.5564000Jan. 2010 July 2010 Jan. 2011 Aug. 2011 Feb. 2012 Sept. 2012 Mar. 2013 Oct. 2013 April 2014Water consumption over time (M3)   Dec. 2011                                                        April 2014 !!!!                      June & July ’12                                      October ‘12Summer ’13 installation: 60% of  toilets & showers Summer ’14: Remaining installations complete.DANIEL WARD                   PLAN 597. GREEN COLLEGE (#221)           PROF. HONEY-ROSÉS  OCTOBER 10TH2. Results of  Renovations 	 Table 2 compares two periods: Fall 2012, when no low-flow technologies had been introduced, and Fall 2013, when 40% of  suites had just been retrofitted with low-flow shower heads and toilets. The table shows a significant decrease of  30.5% in water consumption. Is this due to water conservation renovations? Perhaps. Some alternative or contributing explanations could be that September 2012 was an unseasonably warm month, and therefore water usage increased.  It 1is plausible UBC campus engagement efforts around conservation during this Fall period (ie. “Do it in the Dark”) could have contributed to consumption reductions as well.  	 While the statistics in this table suggest the renovations had an impact, a larger post-rennovation study period needs to be assessed before conclusive results can be obtained.	  Table 2: Pre and Post Renovation  3. Conclusion 	 Green College is achieving water savings. These savings are a part of  campus wide water reductions due to significant retrofitting program and the inclusion of  low-flow technologies in all new UBC facilities and major residential developments (ie. UTown) (Water Action Paper, SustainUBC). 	 This data analysis demonstrates a steady reduction in water consumption over the last 4 years at Green College and a more pronounced reduction since the installation of  water saving technologies. The reductions observed in Fall 2013 reflect only 60% of  low-flow renovations, with the remainder occurring in the Summer of  2014. A review of  readings from Fall 2014 should soon illustrate a more accurate understanding as to what extent these new technologies are responsible for the Green College water savings. Fall 2012 Fall 2013 September 871 1074October 2137 1081.5November 1650 926.5December 1078 900Mean 1434 995.5% change +30.5 Standard deviation 572.878 95.637"4ASSIGNMENT #1 For most of  the Metro Vancouver region, summer is a high-usage season for water. UBC’s unique demographics 1(ie. large population of  students and a high vacancy in the summer) means that summer is a low-usage season for its facilities. An extended summer heatwave into September might explain higher September water usage in 2012 when compared to September 2013. 

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