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Effects of Annual Snowmelt on the New York City Water Supply

Effects of Annual Snowmelt on the New York City Water Supply. Adam Czekanski 29 November 2005. Agenda. The NYC Water Supply System Geographic Setting Delaware / Catskill Watershed Watershed Delineation Snowmelt Collection / Distribution / Total Rainfall Data / Totals Conclusion.

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Effects of Annual Snowmelt on the New York City Water Supply

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  1. Effects of Annual Snowmelt on the New York City Water Supply Adam Czekanski 29 November 2005

  2. Agenda • The NYC Water Supply System • Geographic Setting • Delaware / Catskill Watershed • Watershed Delineation • Snowmelt Collection / Distribution / Total • Rainfall Data / Totals • Conclusion

  3. The NYC Water Supply System • Three systems: Delaware/Catskills (90%), Croton (10%) • 1.4 billion gallons of water per day to 9 million people • ~ 550 billion gallons of storage capacity (19 reservoirs) • Watershed covers 4,000+ square kilometers

  4. The NYC Water Supply System Courtesy of the City of New York Department of Environmental Protection

  5. Geographic Setting

  6. Delaware / Catskill Watershed • Six HUC span • ~ 460 billion gallon capacity • Six reservoirs

  7. Delaware / Catskill Watershed

  8. Watershed Delineation • 21 USGS stream gages used initially • CONSISTENT ERRORS / MUCH FRUSTRATION

  9. Watershed Delineation • Reservoir outlets ultimately used (SUCCESS!!) • Watershed area = 4,071 km2

  10. Watershed Delineation

  11. Watershed Delineation

  12. Snowmelt Data Collection • National Operational Hydrologic Remote Sensing Center (NOHRSC) interactive web page • 25 observation stations selected • Monthly snowmelt data taken from each • Data availability begins January 2004

  13. Snowmelt Distribution • Raw snowmelt data made into x/y event and interpolated to raster • Data range is January – April of specified year

  14. Snowmelt Total • Snowmelt raster overlaid with delineated watersheds • Zonal statistics used to sum snowmelt (mm) • Multiply by cell size for total snowmelt volume (m3)

  15. Snowmelt Totals • Winter 2004: 3,207,770 m3 (850 million gallons) • Winter 2005: 5,617,850 m3 (1.5 billion gallons)

  16. Rainfall Totals • May and June selected as sample months • PRISM data used for monthly precipitation averages / converted to raster • Total precipitation in the watershed (using zonal statistics): • May: 453,762,618 m3 (119.9 billion gallons) • June: 429,721,518 m3 (113.5 billion gallons)

  17. Conclusion The affect of snowmelt on reservoir levels is not nearly as significant as the affect of rainfall

  18. Lesson Reinforced WORK SMARTER NOT HARDER

  19. Final Conclusion GIS is Satan’s spawn!!!

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