1. Development and Application of a Regional Model of NY/NJ Harbor For the Protection of Beaches and Shellfish Areas Charles Dujardin HydroQual, Inc. September, 2008

2. Regional Model Development Overview Planned and Unplanned Sewage Discharges Causes Regional Concern Planned and Unplanned Sewage Discharges Causes Regional Concern Lack of Tri-State Communication is Evident Lack of Tri-State Communication is Evident Lack of Predictive Tool is Evident Lack of Predictive Tool is Evident Impact on beaches and shellfish areas Regional Bypass Workgroup is Formed Regional Bypass Workgroup is Formed Establish Communication Protocol Develop Predictive Tool to Assess Conditions

3. Regional Events of Concern Pipeline Leak and Pump Station Bypass near City Island Pipeline Leak and Pump Station Bypass near City Island Precautionary Closures at Orchard Beach Westchester County Closes Beaches Connecticut Closes Beaches

4. Regional Bypass Workgroup Participants Wastewater Administration Wastewater Administration NYS DEC NJ DEP CT DEP IECEPA NYC DEP USCG Consultant Consultant HydroQual, Inc. Shellfish & Health Shellfish & Health NYS DEC NYS DOH NJ DEP FDA NYC DOH Nassau Co HD Westchester Co HD Rockland Co HD Suffolk Co HD NPS

5. Model Development Considerations Parameters of Concern Parameters of Concern Total/Fecal Coliform Enterococci Water-bodies Considered Water-bodies Considered NY-NJ Harbor Long Island Sound Atlantic Ocean (NJ Coast) Input Variables Input Variables Duration, Quantity & Quality of Discharge Temperature

6. Regional Bypass Program Discharge Characterization Specifications Discharge Characterization Specifications Select Discharge Location Volume Rate (MGD) Concentration View Results View Results Select Site Location View Temporal Profile View Animations

7. Initial Pathogen Discharge Model is Developed Limitations of Initial Model (1998) Limitations of Initial Model (1998) Limited number if discharge locations Limited number of viewing locations Could not handle multiple discharges Time of discharge within tidal-cycle is approximated Model Improved in 2008 Model Improved in 2008 Computer speed, GIS Application Unlimited number of discharge locations Model results may be viewed through animations Multiple discharges are possible

8. Model Domain Full Domain NY/NJ Harbor

9. GIS Information Layers Available (7) Example: Beach Locations

10. GIS Information Layers Available (7) Example: CSO Locations

11. Add Load Specify: Flow, Duration, Time, and Concentration and Click on Location

12. Model Execution After Discharges Are Entered User Clicks “Run Model” After Discharges Are Entered User Clicks “Run Model” Model Execution Takes About 5 Minutes Model Execution Takes About 5 Minutes User Immediately Views Results User Immediately Views Results Time Series in Any Model Segment Animation (Movie) of Results

13. User May View Time Series Results In Any Model Segment

14. View Animation Example: 6 Hours After Release

15. View Animation Example: 12 Hours After Release

16. View Animation Example: 25 Hours After Release

17. View Animation Example: 44 Hours After Release

18. User May Zoom-In To View Details of Results

19. Summary Model Has Been Distributed To Over a Dozen State and Local Environmental, Health, and Shellfish Agencies Model Has Been Distributed To Over a Dozen State and Local Environmental, Health, and Shellfish Agencies There Are Nearly 100 Spill Events Per Year There Are Nearly 100 Spill Events Per Year Agencies Can Quickly Assess If There Is a Concern After a Spill Event Agencies Can Quickly Assess If There Is a Concern After a Spill Event