City of greer stormwater utility fee billing


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City of greer stormwater utility fee billing

  1. 1. Stormwater Utility Fee Billing:Improving Accuracy via ArcGISJustin Glenn, GIS PlannerCity of Greer, SCFebruary 25th, 2011
  2. 2. Project Overview• Deadline was approximately 3 weeks out frominitial discussions• Impervious surface database needed…… A high degree of accuracy… To be legible by the parties seeking theinformation… To be easily transferrable in a universal, electronicformat… Easily manipulated for future assessments• GIS had best capabilities to address problems in anefficient manner
  3. 3. Stormwater Management Fee Program• SC State Code states that authority is granted to localgovernments to establish stormwater utilities• Sec. 90-282 of City of Greer Municipal Code states:“The amount of the stormwater fee to be paid will bedependent on the classification of the property…”“Developed nonresidential properties, which shall include butnot be limited to triplexes; apartment buildings andcomplexes; condominiums, boarding houses; commercialproperties; industrial properties; parking lots; recreational,institutional, and governmental facilities; hotels; offices;schools and other educational facilities; theatres and otherfacilities for performance; and churches and other religiousinstitutions and facilities.”
  4. 4. Purpose of Utility Fee• To implement requirements of the municipalseparate storm sewer system permit• To make municipal drainage improvements• For flood improvement projects• For industrial stormwater permit implementationcosts related to municipal operations• For new stormwater equipment
  5. 5. Limitations• Project needed to be quickly but accuratelycompleted• Lack of scripting resources to automateprocessing• Budget constraints– No additional staff
  6. 6. What we needed…• City of Greer GIS Data– Incorporated area• Annexation study reduced false positives– Address points– Zoning• Greenville County GIS Data– Parcels– Building Footprints– Other impervious areas (ie – parking lots, etc.)– Orthophotography• Duplicated parcel dataset to append impervious data to
  7. 7. Procedure• Extract incorporated parcels from countyparcels• Separate parcels with non-residential land usecodes from residential (excluding apartments)• Double check areas with zoning issues toensure land use codes are legitimate• Check recent ordinances for parcels rezonedto commercial/industrial use
  8. 8. Procedure• Use parcel dataset to select building footprintsand other impervious surfaces related to non-residential lots• Create polyline file and copy parcel dataset toit• Use polyline file to clip other impervious arealayer
  9. 9. Procedure• Combine fractured/exploded pieces ofbuilding footprints and other imperviousareas, parcel by parcel• Perform geometric calculation on remainingpolygons to estimate the total area ofimpervious surface for each parcel• Add/append impervious surface data tocommercial parcel dataset– New fields used long integer data types
  10. 10. Problem• Some areas had impervious surfaces andbuilding footprints that stretched acrossmultiple parcels
  11. 11. Resolution• Building footprints were assigned to parcelwhere geographic center was located• Other impervious surfaces were split andportions were assigned to parcel containing it
  12. 12. Transfer of Data• Exporting capabilities of ArcGIS allowedStormwater Department to calculate fees forimpervious surfaces in a spreadsheet program
  13. 13. Results• Project resulted in completion by deadline• ~30 properties added to Stormwater inventoryfrom previous year– Only two properties were gained via annexationsin 2010• 2.9% increase in revenue from previous year• Easily updateable database for futureassessment
  14. 14. Thanks to…• Greenville County GIS• Spartanburg County GIS• Lillian Hanley, Stormwater Engineer• Phil Rhoads, Director - Building andDevelopment Standards• Glenn Pace, Planning and Zoning Coordinator