NYC Operations Support Tool Client: NYCDEP Location: Queens, NY Hazen and Sawyer led development of the Operations Support Tool (OST), a state-of-the-art decision support system for the New York City water supply system. This innovative tool uses near real-time data, hydrologic forecasting, and predictive modeling to guide reservoir system operations, identify future water stress conditions, and take preventive actions to maintain supply reliability, water quality, and environmental performance.Operations Support Tool dashboard showing rule curves, observed storage levels, and projected storage levels for a key subsystem of three reservoirs. Light grey lines indicate ensemble members; colored lines represent the 10th, 50th, and 90th percentile levels of the ensemble. The simulation indic

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