CONUS-wide Projected Flood Frequency and Uncertainty Estimates, Version 1.0

This dataset presents CONUS-wide projected flood frequency and uncertainty estimates across approximately 2.7 million NHDPlusV2 river reaches over the CONUS, including hydropower dam locations. The methodology producing this dataset leverages CONUS-wide ensemble streamflow projections generated from hydrologic simulations driven by downscaled and bias-corrected Coupled Model Intercomparison Project Phase 6 (CMIP6) outputs. The reach-level flood frequency and uncertainty estimates are derived using spatially consistent regional L-moment algorithm applied across clusters defined by the US Hydrologic Unit Code Subregions (HUC4s and HUC8s) and NHDPlusV2 stream orders under the stationarity assumption. For ease of the users, the dataset includes the projected change vector files as well as flood frequency and uncertainty estimates for hydropower dam locations in the CONUS. The non-stationarity assumption-based estimates are under preparation and will be updated in Version 1.1. This dataset is derived to support the "Impact-Informed Dam Safety Risk Assessment for Securing Hydropower Assets" project for the US Department of Energy (DOE) Water Power Technologies Office (WPTO). For further details, refer to Kao et al. (2022), Ghimire et al. (2023), and Ghimire et al. (2025). This dataset was originally published on 2025-11-05 and updated/expanded on 2026-09-03. See included README for additional information.