Risk Analysis of Water Supply and Dependability Projects

New York Water Supply Kensico Reservoir | New York, NY, US
New York Water Supply Kensico Reservoir | New York, NY, US
New York City Department of Environmental Protection
New York, New York, USA

The New York City Department of Environmental Protection (NYCDEP) retained HDR to conduct benefit-cost and cost risk analyses on several infrastructure projects to help NYCDEP evaluate the value and risk of major infrastructure decisions associated with its water supply. As part of this engagement, HDR evaluated the cost and schedule tradeoffs among water supply dependability options for a variety of projects that would supplement current water supplies. Critical questions related to these projects involve when the systems would be operable, how well they will perform and how much they would cost. These projects are being considered to provide additional redundancy to New York City's water supply system and to temporarily serve as primary sources during repairs.

HDR also evaluated the consequences and risks for the Rondout West Branch Delaware Tunnel Repair work and Kensico-City Tunnel. The objective was to assess the risks in the cost and schedule of the tunnel repair work as well as the duration that the tunnel would likely be out of service for repairs and the cost of those repairs. Moreover, HDR developed an approach and model to determine the value of projects that would temporarily replace, and eventually supplement, water supplies during tunnel rehabilitation efforts. We also evaluated the cost and schedule for one of the largest ultraviolet (UV) disinfection facilities in the country.