New York City s Operations Support Tool (OST) Delaware River Basin RFAC Meeting December 14, 2010
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1 New York City s Operations Support Tool (OST) Delaware River Basin RFAC Meeting December 14, 2010
2 Presentation Outline What is OST? Background OST Components Forecasts OST Usage OST vs. Safe Yield Project Schedule 2
3 What is OST? Decision Support System quantifies performance of alternative operations help make operating decisions Provides robust quantitative assessment of: Expected inflows Diversion needs Release requirements Storage levels Drought risk Better defines capacity of the system to meet water quality and environmental objectives Maximize additional benefits while maintaining water supply reliability More robust water qualitybased operation DOES NOT tell operators what to do DOES help operators examine how they can best meet multiple objectives DOES provide quantitative basis for decision-making 3
4 Background 4
5 New York City Water Supply 3 systems Delaware, Catskill, and Croton 19 reservoirs & 3 controlled lakes 2,000 square mile watershed in parts of 8 upstate counties Serves 9 million people (1/2 of population of New York State) Delivers ~ 1.1 billion gallons per day 45% of demand met by Delaware basin reservoirs Unfiltered supply (Cat/Del) 5
6 Operational Challenges Complex system 19 reservoirs Design allows flexibility Infrastructure service New infrastructure Multiple Objectives Water supply reliability Highest quality water Environmental benefits Spill mitigation Complex rules Delaware Basin rules Part 670 & SPDES Croton System
7 OST Impetus Catskill System turbidity control Reduce frequency/duration of alum treatment Filtration Avoidance Determination (FAD) Granted 1997, renewed 2002, 2007 Catskill System turbidity a major concern 2007 FAD required OST be part of turbidity management 7
8 Enhanced System-wide Operations OST will provide decision support for entire NYC system Delaware Basin releases Peak flow mitigation (snowpack management) Planning for major facility outages Support for emergency / contaminate spill response Delaware and Catskill Shaft 4 interconnection Catskill Delaware Ultraviolet Facility Croton Filtration Plant Advanced warning of turbidity events via forecasts Simulate turbidity control strategies in near-real time OST will help address multiple water quality and environmental objectives while still fulfilling core water supply reliability requirements 8
9 Water Supply Reliability: Quantity Priority: meet water supply needs Goal: ensure overall system reliability Reservoirs full at start of drawdown (~ June 1) Balance reservoir drawdown Considerations: probability of refill release requirements economics infrastructure OST can help quantify risk 9
10 Water Supply Reliability: Quality Priority: meet water supply needs Goal: provide highest quality water Extensive real-time monitoring Response to turbidity events, chemical spills OST can help quantify risk 10
11 Environmental Objectives NYC reservoirs provide benefits to downstream interests Regulatory Framework 1954 Supreme Court Decree FFMP NYCRR Parts Potential for OST to provide additional releases to benefit downstream interests 11
12 OST Components 12
13 OST Background - OASIS-W2 Model Builds off OASIS-W2 OASIS: Mass-balance reservoir system model W2: 2D hydrodynamic and water quality model Simulates system operations Operates on daily time step 13
14 Existing Oasis-W2 vs OST 14 Existing OASIS Model Operations Support Tool Underlying Engine NYC OASIS-W2 Linked Water Supply-Water Quality Model Main Purpose Evaluate long-term operating rules Support near-term decision-making (evaluate exceptions to the rules) Simulation Mode Long-term time series Position Analysis (today s system status, looking forward x months) Reservoir Inflows Historical Probabilistic Forecasts -Account for current basin conditions Reservoir Status Static (manual updates) Dynamic (linked to SCADA, etc.) User Interface & Reporting Standard Customized for Operators
15 Probabilistic (Ensemble) Forecasts in OST 15
16 Why Probabilistic Forecasts? Effectiveness of today s operating decisions depends on future inflows Decisions can thus be improved with inflow forecasts Probabilistic forecasts give range and likelihood of future inflows Help managers quantify risk associated with operations decisions 16
17 Pepacton/Cannonsville/Neversink Forecasts 17
18 Probabilistic Output: Delaware Storage 18
19 Using Forecasts for Real-Time Decisions Long-Term Operating Policy Individual Traces Initial Reservoir Conditions Storage / Elevation Spill Demand Releases Operation Policy Adjustments Risk Assessment
20 Ensemble Forecast Sources Historical inflows Conditional inflows ( Hirsch ) NWS ensemble forecasts 20
21 Historical Inflows Simplest approach Does not account for current conditions or meteorological forecasts 21
22 Conditional ( Hirsch ) Forecasts Developed by Dr. Robert Hirsch, USGS, 1979 Account for current conditions but not meteorological forecasts Historical inflows conditioned by recent inflows Relies on serial correlation between recent and future inflows Monthly Hirsch in use by DEP, daily Hirsch by late
23 Timeseries: Historical vs. Conditional 23
24 NWS Ensemble Forecasts Currently under development by NWS Existing AHPS forecasts are deterministic, not probabilistic DEP providing substantial support to expedite Will account for current conditions and meteorological forecasts Will include hindcasts Will be primary forecast for OST 24
25 OST Usage: System-wide Refill Probability & Drought Risk Analysis Outage Planning & Emergency Management Operating Rule Development & Water Supply Planning Climate Change Planning & Demand Management Studies New Infrastructure 25
26 OST Usage: Delaware Basin Predict how much water may be available for release while maintaining water supply reliability Develop & evaluate alternative release plans Support Delaware basin release programs Probabilistic, risk-based approach to define excess release volumes available Requires commitment from other Decree Parties to longterm sustainable water supply sources Potential for increasing net system benefits Dual ability to protect NYC supply while providing downstream benefits 26
27 OST Usage: Modified Release Plan Example Modification of the FFMP release tables Based on the Joint Fisheries White Paper Modified releases for drought day neutrality, protection of Neversink supply Select appropriate release table based on OST output 27
28 FFMP support: 100 mgd available vs 35 mgd available 28
29 OST Usage: Modified Release Plan Today s Conditions Operating Rules Ensemble Inflow Forecasts OST INPUT Reservoir Levels Infrastructure Status Water Quality Demand Projections System Reliability Reservoir Balancing Drinking Water Quality Releases Storage Levels Water Quality Refill Probability OST OUTPUT High Water Availability Probability of Excess Water At Specified Risk Level Low Water Availability DELAWARE RELEASE DECISIONS 100 mgd Table 75 mgd Table 50 mgd Table 35 mgd Table 20 mgd Table 10 mgd Table 0 mgd Table
30 OST vs. Safe Yield Safe Yield is used as a drought planning tool - not the basis for normal operations with an adequate supply of water NYC operates based on quantity, quality, and economics Reservoirs are chosen for diversions to: deliver the highest quality water maintain the FAD avoid chemical treatment be fiscally responsible OST will enhance our ability to continue to deliver a reliable supply of high quality water OST can provide downriver benefits while preserving the City s rights under the Decree whereas safe yield operations harm the City
31 Phased deployment: OST Project Schedule June OASIS in PA mode w/ Hirsch forecasts Aug OASIS-W2 in PA mode w/ Hirsch forecasts Dec Signal Acquisition, Database, Daily Hirsch Jun Prototype Graphical User Interface Feb 2012 Upgrades to Graphical User Interface October 2012: Full beta version October 2013: Final version 31
32 Discussion 32
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