Thornton Champion Analysis Wsi 2010

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Indoor and Outdoor water use analysis

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Thornton Champion Analysis Wsi 2010

  1. 1. Evaluating Water Use Trends ofThornton’s Water Saving Champions Water Smart Innovations Conference October 6-8, 2010 Laura Wing, City of Thornton, Colorado Laura.Wing@cityofthornton.net Ian Hanou, AMEC Earth and Environmental Ian.Hanou@amec.com AMEC Earth & Environmental, Inc.
  2. 2. The Thornton Water DriveSocial Marketing Campaign launched in2007Objectives: Increase awareness about the need to conserve Increase voluntary water conservation behaviors Market water efficiency incentive programs
  3. 3. Target AudienceAdult residents inthe Thornton waterservice area - 2007 Population 135,000 34,000 residential accounts 92 gallons per capita per day (gpcd)
  4. 4. Campaign Messages
  5. 5. Water Saving ChampionsPledge to save 10gallons a dayRecognition onThorntonWater.comMonthly E-newsletterPostcard mailingsChampion EventYard Signs
  6. 6. Evaluation of Campaign EffectivenessBaseline Telephone SurveyAnnual Evaluation SurveyChampion Indoor Water Use AnalysisChampion Outdoor Water Use Analysis
  7. 7. 2007 Baseline Survey68% - Lack of commitment18% - Competition for the greenest lawns14% - Lack of awarenessReported already practicing techniquesMotivators: Environment Lower water billsWilling to do more to save water
  8. 8. 2008 Evaluation Survey66% saw messages (n=527)86% thought messages encouragedthe community to saveSelf reported (not prompted) watersaving techniques: 46% - Reduced lawn watering 19% - Wash full loads 18% - Turn water off when brushing teeth 12% - Take showers in 5 minute or less
  9. 9. Champion Indoor Water Use312 Champion accounts analyzed64% reduced indoor use after pledging500 gallons per month less than thesingle family residential average Champions - 4,500 gallons/month Single Family - 5,000 gallons/month
  10. 10. Champion Outdoor Water UseEstimated irrigated square footage for Championaccounts (Irrigable Area Analysis)Utility billing database join by account numberOutdoor water use in gallons per sq. ft. 278 accounts May – September 2006 pre-pledge 2007 pledge year 2008 post-pledge
  11. 11. Champion Outdoor Use vs. Turf Water Requirement (ET) 17.5 17.0 16.5Gallons/sq. ft. 16.0 15.5 Turf Water Req. 15.0 Champion Use 14.5 14.0 13.5 13.0 2006 2007 2008
  12. 12. Champion Outdoor Water Use Trends 2007 compared to 200666% of Champion accounts showed lowerusage 25% reductionAverage of all Champions 12% reduction 2 gallons/sq. ft. savings
  13. 13. Champion Outdoor Water Use Trends 2008 compared to 200662% of Champion accounts showed lowerusage 27% reductionAverage of all Champions 10% reduction 1.7 gallon/sq. ft. savings
  14. 14. Irrigable Area Analysis ObjectivesDevelopment of irrigable landscape data at aparcel level within the Service AreaInformation will be used support the estimationof water use and irrigation demands throughoutthe communityCharacterize high and low irrigable areasAssess irrigable acres with metered dataCompatible GIS deliverables that Thornton candirectly use
  15. 15. DeliverablesAugust 2009, 1-foot, color-infrared orthorectified imageryUpdated parcels database containing square footage andpercent of land cover classes Shifted and non-shifted parcels, extended parcels, and public right- of-way boundariesLand cover data Polygon data of high irrigated, low irrigated, non-irrigated vegetation, total irrigated area and tree canopyGIS land cover layers above with the polygons split byparcel and public right-of-wayGIS model for calculating land cover square footageReportPowerPoint presentationLiDAR-derived digital surface model (DSM)
  16. 16. MethodologyAMEC analyzed the multispectral imagery using a technique known as geographic object-based image analysis (GEOBIA) to develop a 4-class land cover dataset that included… 1) High irrigated 2) Low irrigated 3) Non-irrigated vegetation 4) TreesThe automated classification from the GEOBIA process was then refined with a manual quality assurance/quality control process to finalize the land cover
  17. 17. Land Cover ClassificationsHigh: 20” or more of supplemental irrigationduring each annual growing seasonLow: 5-20” of supplemental irrigation duringeach annual growing seasonNon: vegetated areas with very low greenness,generally not irrigatedTrees: roughly 75-100 square foot minimummapping unit, 90% accuracy
  18. 18. Imagery & Classification ResultsColor infrared imagery Tree Canopy Irrigable Land Cover
  19. 19. LimitationsWhile “greenness” is a strong indicator ofoutdoor water application it does not necessarilyrepresent specific levels of irrigationOther factors include natural precipitationprevious to the aerial imagery collection, soils,fertilizer practices, and slopeTree canopy treated as “high-irrigated” categoryfor three main reasons: Lack of specific research data on the water requirements for local urban tree species No data was available on the distribution of tree species, Wasn’t cost-effective to identify whether the area under tree canopy is being irrigated or to what level
  20. 20. Parcel Expansion ProcessThe Reason: irrigated area extends beyond a parceledgeThe Need: to capture all irrigated area andaccurately tie that to a given parcelThe Solution: after a thorough review, extendparcels by 15-feet Only applied where necessary Impervious layers were used to remove unneeded area QA/QC performed: expansions were deleted where: They did not contain vegetation, were in backyards or bordered a greenway, or were smaller than 10 square feet
  21. 21. Parcel Expansion Example
  22. 22. Right-of-Way Irrigable AreasWhat about irrigated areas in the publicrights-of-way (ROW)? Defined as irrigated area in public land, maintained by the City of Thornton, not bound by a parcel Not “double-counted” from expanded parcels Delivered by subdivision boundary rather than simply citywide
  23. 23. Right-of-Way & Subdivisions
  24. 24. Developing the Irrigable Areas DatabaseCreate GIS Model and define parcel attributes(fields) to delivery: Parcel number Address Lot Size Irrigable Area Fields (shown on next slides)Separate parcel database into Single-Family,Non-Single Family and Right-of-WayAlso delivered in Access and Excel spreadsheetformat
  25. 25. GIS Models* One of 3 GIS (geoprocessing) models built tocalculate land cover square footage per parcel.These models were included in the delivery.
  26. 26. Irrigated Area Database
  27. 27. Joining Water Use with the Irrigable Areas DatabaseWhy: Linking water utility data to the irrigation database will enableThornton to evaluate the relationships between irrigation andconsumptionHow: A ‘spatial join’ ties the two sets of information based onlocation; a meter that sits within a parcel gets spatially associatedwith that parcelIssues: Information between parcels and meters can be linked inthis manner only when there is one meter for each parcel, like withsingle family homes; other situations will require a special approachFor single family properties this join has been made as part of thedeliverable Irrigable Areas Database; for all other property types themeter information will need to be linked at a later time
  28. 28. Recommendations & Future ConsiderationsUpdates to Irrigated Area DatabaseParcel GeoAccurizingUrban Tree Canopy AssessmentWater Budget Rate StructureDevelopmentLawn Irrigated Return Flow (LIRF)Updates to Impervious Surface Layers
  29. 29. Contact InformationCity of Thornton:Laura Wing, Laura.Wing@cityofthornton.netwww.ThorntonWater.comAMEC:Ian Hanou, Ian.Hanou@amec.com

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