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Rockland county water sah


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Desalinator proposed for Rockland County

Desalinator proposed for Rockland County

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  • 1. Rockland County Water: Alternatives for Supplying Demand
    Sally Haas
    April 18, 2010
  • 2. Rockland County
    • Population: 298,545
    • 3. Number of Housing Units: 99,324
    • 4. Land Area: 174.22 square miles
    Hudson River
  • 5. Rockland Water Supply
    Rockland County Water Supply Sources
    United Water NY 90%
    Small Water Companies 7%
    Private Wells (6,000 - 8,000) 3%
    United Water NY Water Supply Sources
    Lake DeForest 37%
    Alluvial well fields (includes Ramapo and Mahwah Valley well fields) 31%
    Bedrock wells 32%
    Lake DeForest
  • 6. Groundwater supplies 61% percent of the drinking water to Rockland County. This come from wells located in the southern 2/3rds of the county
    Surface water supplies 39% percent of the drinking water to Rockland County including Lake DeForest, the Hackensack River and the Mahwah River.
  • 7. Water Supply
    Peak Supply is the volume available over a few days
    Rockland County peak supply capacity is 44.5MGD (million gallons per day) with an additional 3MGD possible
    2006 Average sustainable supply was 32-34MGD
    Factors limiting supply:
    Close spacing of production wells
    NYSDEC limit allocation permits
    De Forest Lake withdrawal limits and treatment capacity
    Periods of low precipitation
    Development (sewage treatment and storm drainage) decreases recharge
  • 8. Supply and Demand
    2006 Average sustainable supply 32-34MGD
    Peak supply 44.5 MGD with 3 MGD available
    Actual average daily demand for 2005 was 31.06 MGD
    2010 estimated daily demand- over 33 MGD with summer peak of 49MGD.
  • 9. Other Potential Sources of Water
    A new reservoir at Ambrey Pond
    Desalination of brackish Hudson River water
    Additional groundwater supplies
    Reuse of wastewater
    Increased use of Lake DeForest
    Use of the Suffern Quarry.
  • 10. Short-term Projects
    Update Letchworth Water Treatment Plant- 2MGD
    Sparkill Well Field Clean-up- 0.5 MGD
    New wells from purchase of existing private wells-1-1.5 MGD
    Divert water from Potake Pond to Ramapo River to maintain levels in dry conditions
    Store Lake DeForest spill during wet conditions
    Reservoir at Ambry Pond-NYS has not permitted new damn
    Divert flood waters from Ramapo River to Suffern Quarry-not pursued.
  • 11. Conservation Measures
    Limiting Demand by Conservation is desirable
    Can’t be counted on
    Can’t be legislated
    Limiting development-non adherence
    Personal efforts
    Fix leaks
    Low volume toilets and restrictive shower heads
    Low capacity washer and dishwasher
    Limit use-turn off faucets
  • 12. Desalinate Hudson River Water
    In September 2007 United Water submitted a proposal to build a pilot desalinating plant to be built in Haverstraw, NY.
  • 13. The Salinity Gradient
    The table on the right shows salinity data in parts per million (ppm) for various points along the river measured on Oct 12, 2006.
    4 Points and their salinities are illustrated on the map.
    Haverstraw is marked.100 ppm is considered drinkable.
    Mile 55 80
    Mile 40 1600
    Mile 25 5180
    Mile 0 26,000
  • 14. Factors Affecting the Salinity
    Salinity fluctuates with the tidal cycle; peaking with high tide, dropping at low tide
    Rainfall has a strong and delayed affect on salinity
    Data from Beczak Environmental, Yonkers, NY; River Mile 18
  • 15.
    • The location of the Salt Front (salinity 100 ppm ) in Mar-Apr and Aug-Sept measured by the US Geological Survey shows seasonal variation in the location of the Salt Front.
    • 16. Salinity of 100 ppm is considered drinkable
    • 17. Rockland County is located between RM 23 to 45.
  • Desalination
    Using a process similar to dialysis, water is forced through a fine membrane leaving the salts and other impurities behind
    Click to play video on how desalination works
    Bear with the commercial and manually return to the presentation when you are finished.
  • 18. Costs for Reverse Osmosis Desalinator
    Capital costs
    Membrane life
    Energy for desalination process
    Chemicals treatments through out the process
    Packaging and transportation
    Or infrastructure
    Waste disposal
  • 19. The proposed plant will cost between $80 and $100 million
    Energy consumption:
    4427-6520 kilowatt hr/million gal.
    Compared with 250-3500 kWh/Mg for traditional treatment facilities
    Estimated initial production 1.5 mgd
    Need distribution to existing infrastructure
    Waste to be processed through the Joint Regional Sewage Treatment facility
    Based on video There is 30% recovery of intake. The rest is processed as waste.
    Haverstraw Project
  • 20. Haverstraw Site
    The proposed site in Haverstraw is unused land owned by US Gypsum (produce wallboard and construction products)
    Located across from Indian Point Nuclear Power Plant
    Potentially radioactive contaminants not removed by desalinator
    Towns of Ramapo and Stony Point have passed resolutions opposing desalination facility due to proximity to Indian Point and costs.
    Not likely to run full-time only during low tide-related low salinity
    More efficient, more costly not running at capacity
    No mention of renewable energy sources like solar or wind
    Some high salt waste water will backwash into the Hudson bringing other concentrated contaminants (PCBs)
  • 21. Working Desalinators Worldwide
    Majority and largest are in the Middle East and North Africa
    The largest is in Israel
    Evaporation or distillation most common method
    There are 18 in the US
    California, Texas, Arizona, and Florida
    Reverse Osmosis most common
    February 2010: Solar panals for Swansea, MA plant to provide 1/6th-1/4th of energy
    Australia is the only one using energy from a renewable source
  • 22. Benefits of Desalinator
    On December 14, 2006, the New York Public Service Commission granted United Water New York permission to raise its rates for three years in a row, starting with a 23% hike in 2007.
    UWNY charged with plan for sustainable solution resulting in proposal for Haverstraw desalinator in January 2007.
    Benefits cited over developing reservoir at Ambrey Pond include: drought tolerance; perceived dam safety concerns from local neighbors; plant expandability; permitting requirements; complexity of construction; and cost.
  • 23. Impressions
    Need to increase supply
    Desalinator to supply 2 MGD by 2015 increasing in phases to 7 MGD
    Current peak demand is 49 MGD
    Are there other alternatives that have not been considered or have been prematurely discounted?
    Withdraw further up river closer to salt front
    Ambry pond and Suffern Quarry
  • 24. Future for Desalinator
    Technology should be developed
    Improvements to decrease costs
    Sustainable energy
    Waste utilization
  • 25. Water Policy and the Public
    United Water has filed the proposal with the State
    A number of Town Hall Meeting are to be Scheduled
    January 12, 2010—No follow-up reports
    April 22, 2010—Public Hearing on Proposed (21%) Rate Hike
    Citizen Action Groups: Sustainable Rockland
    Includes: Sierra Club and Food and Waterwatch
    Resolutions Opposing Desalinator Project
    Towns of Stony Point and Ramapo
  • 26. References
    Company files plan with new york state public service commission Retrieved 4/19/2010, 2010, from
    Haverstraw water treatment plant - water technology Retrieved 4/19/2010, 2010, from
    Hudson river desalination - citizens campaign for the environment Retrieved 4/19/2010, 2010, from
    Is the hudson too salty to drink? data puzzle number 4. Retrieved April 18, 2010
    New york state | map-NY Retrieved 4/19/2010, 2010, from
    Swansea's desalination plant going green - taunton, MA - the taunton gazette Retrieved 4/19/2010, 2010, from
    United water new York’s proposed desalination plant | riverkeeper Retrieved 4/19/2010, 2010, from
    United water sites long-term water supply project in town of haverstraw Retrieved 4/19/2010, 2010, from
    Vanderhoef, S.State of the county address. Retrieved 04/18, 2010, from
    Water supply - desalination Retrieved 4/19/2010, 2010, from
    Water supply - planning Retrieved 4/19/2010, 2010, from
    Water supply - planning Retrieved 4/19/2010, 2010, from