ALERT: AMEC Load Estimation and Reduction Tracking

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ALERT: AMEC Load Estimation and Reduction Tracking

  1. 1. Esri UC2013 . 2013 Esri International User Conference July 8–12, 2013 | San Diego, California Restoring the Chesapeake Bay with ArcGIS Tools for Planning Stormwater Treatment Thomas Williams, EIT, LEED AP AMEC Environment & Infrastructure
  2. 2. Esri UC2013 . The Chesapeake Bay • Largest Estuary in the US • Drains over 64,000 mi2 - 6 States, plus Washington, DC • 2009 Executive Order: - Declared the Bay a National Treasure - Called for a renewed effort to restore and protect the Bay - Paved the way for the Chesapeake Bay TMDL Restoring the Chesapeake Bay with ArcGIS
  3. 3. Esri UC2013 . The Chesapeake Bay TMDL • What is a TMDL? - Total Maximum Daily Load - EPA-established “pollution diet.” - Maximum amount of pollution a water body can receive and still remain healthy. • The Chesapeake Bay TMDL focuses on three pollutants: - Nitrogen - Phosphorus - Sediment Restoring the Chesapeake Bay with ArcGIS Image Credit: 1
  4. 4. Esri UC2013 . Urban Stormwater in the Bay Watershed Restoring the Chesapeake Bay with ArcGIS • Urban stormwater pollution is a major aspect of the Chesapeake Bay TMDL. • The Bay TMDL is affecting Municipal Separate Storm Sewer System (MS4) operators throughout the Bay Watershed. • There are many existing tools for stormwater planning, but most are non-spatial. • How can we use GIS to… • evaluate stormwater treatment options? • track TMDL compliance? • make watershed planning easier? Image Credit: 2
  5. 5. Esri UC2013 . Restoring the Chesapeake Bay with ArcGIS ALERT • AMEC developed a set of Python tools for ArcGIS, called ALERT • AMEC Load Estimation and Reduction Tracking • Initially designed around Virginia’s draft regulations to implement the Chesapeake Bay TMDL. • ALERT framework has since been updated and expanded to apply outside of Virginia and the Chesapeake Bay. • Built to help communities: • plan stormwater projects • quickly evaluate different scenarios • estimate the cost of compliance !
  6. 6. Esri UC2013 . ALERT Process Diagram Restoring the Chesapeake Bay with ArcGIS Water Quality Plan Start / Finish ArcGIS Silverlight Analyze water quality scenarios in ArcGIS Estimate total remaining effort required to achieve water quality goals Non-Spatial results guide further GIS analysis Landuse Data Calculate Baseline Load Develop Projects Calculate Reduced Load Non-Spatial Analysis
  7. 7. Esri UC2013 . ALERT Process: Calculate Baseline Loads Restoring the Chesapeake Bay with ArcGIS Calculate Baseline Loads Landuse Data • Polygon layer attributed with pollutant loading and runoff information. • lbs/ac/yr (Loading Rates) • mg/L (Event Mean Concentrations) Baseline Loads • Total annual pollutant loads (lbs/yr) are calculated. • Simple Method calculations consider: • Impervious area • Runoff coefficients • Annual precipitation either
  8. 8. Esri UC2013 . ALERT Process: Develop Project Database Restoring the Chesapeake Bay with ArcGIS Project Database etc… Water Quality Projects: Pond Retrofit, 65 acres Nitrogen Efficiency: 15% Runoff Reduction: 0% Cost: $275,000 Bioretention, 5 acres Nitrogen Efficiency: 45% Runoff Reduction: 20% Cost: $110,000 Redevelopment, 10 acres Nitrogen Efficiency: 50% Runoff Reduction: 10% Cost: Undetermined Stormwater BMPs Landuse Changes • Treatment area polygons • Pollutant removal and runoff reduction efficiencies • Other relevant information
  9. 9. Esri UC2013 . ALERT Process: Calculate Load Reductions Restoring the Chesapeake Bay with ArcGIS Iterates through project database, calculating and tracking pollutant and runoff reductions. Baseline Loads Reduced Loads (new polygon layer) Detailed Results (pollutant reductions from each project) Project Database Calculate Load Reductions
  10. 10. Esri UC2013 . ALERT Process: Calculate Load Reductions Restoring the Chesapeake Bay with ArcGIS Baseline Loads
  11. 11. Esri UC2013 . ALERT Process: Calculate Load Reductions Restoring the Chesapeake Bay with ArcGIS Reduced Loads Treatment Area
  12. 12. Esri UC2013 . Restoring the Chesapeake Bay with ArcGIS Landuse City of Alexandria, VA Potomac River Basin 15.4 square miles Population: 144,301 (2011)
  13. 13. Esri UC2013 . Restoring the Chesapeake Bay with ArcGIS Landuse (MS4) Identified areas draining to the City’s Municipal Separate Storm Sewer System (MS4).
  14. 14. Esri UC2013 . Restoring the Chesapeake Bay with ArcGIS Baseline Loads
  15. 15. Esri UC2013 . Restoring the Chesapeake Bay with ArcGIS Baseline Loads BMPs Proposed BMPs included pond retrofits, new ponds, bioretention, and projected redevelopment.
  16. 16. Esri UC2013 . Restoring the Chesapeake Bay with ArcGIS Reduced Loads BMPs
  17. 17. Esri UC2013 . Restoring the Chesapeake Bay with ArcGIS Reduced Loads
  18. 18. Esri UC2013 . ALERT Process: Non-Spatial Analysis Restoring the Chesapeake Bay with ArcGIS Baseline Loads Reduced Loads Reductions Non-Spatial Analysis • Results from GIS analysis can feed into a non-spatial component. • Non-spatial ALERT tools are used to roughly estimate the remaining effort needed to meet water quality goals. • Project needs (acres of treatment) • Capital and annual maintenance costs • Total area of required additional treatment is back- calculated based on pollutant reduction targets.
  19. 19. Esri UC2013 . ALERT Process: Non-Spatial Analysis Restoring the Chesapeake Bay with ArcGIS 1. Project Mix % by Area Bioretention 10% Filtration 10% New Ponds 30% Pond Retrofits 50% 2. Target Pollutant Phosphorus 3. Results Treatment Area 145 acres Initial Cost $3.5 m Annual Maint. $81,000 Baseline Target Reduced Phosphorus Baseline Target Reduced Nitrogen Baseline Target Reduced Sediment Pollutant Loads (lbs/yr) Results are used to guide further GIS analysis.
  20. 20. Esri UC2013 . Closing Thoughts 1. GIS tools make planning stormwater treatment: • Easier • More cost-effective • More reality-based 2. Non-spatial analysis can be informative, but requires verification. • Results should be regarded as approximations. • Ouputs guide further GIS- based planning.
  21. 21. Esri UC2013 . Thomas Williams, EIT, LEED AP Water Resources Engineer AMEC Environment & Infrastructure thomas.williams@amec.com More Information: Image Credits 1. http://www.flickr.com/photos/particlem/ 3733639670/sizes/o/in/photostream/ 2. http://www.flickr.com/photos/thirteenofclubs/ 3383558429/sizes/o/in/photostream …

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