Statewide map datasets for predicting postfire debris-flow hazards prior to fire across California

This data release contains nine statewide map datasets relevant to predicting postfire debris-flow hazards prior to fire across California. The maps and associated data can be used to identify potential postfire hazards for individual basins (0.025 to 8 km2) as a function of debris-flow likelihood, volume, combined hazard classification, or annual probability of postfire debris flow. The datasets were developed for hazard assessments and the simulated values (e.g., simulated dNBR and simulated BARC) alone are not intended for use in more detailed modeling applications (e.g., prefire or postfire hydrologic and hydraulic modeling) without acknowledgement of potentially high uncertainty. The statewide maps include (1) simulated differenced Normalized Burn Ratio (dNBR), (2) simulated Burned Area Reflectance Classification (BARC), (3) debris-flow 15-minute rainfall intensity threshold (T), (4) debris-flow likelihood for a 15-minute duration 24 mmh-1 storm, (5) debris-flow volume, (6) debris-flow combined hazard class, (7) annual probability that the 15-minute triggering rainfall intensity is exceeded for a debris-flow likelihood of 50% (P(R>T)), (8) annual fire probability (P(F)), and (9) annual probability of a fire and subsequent above-threshold rainfall intensity within the year following fire (P(F) * P(R>T)). The README files are available in multiple formats, each containing detailed descriptions of the contents of this repository. Additional details of this dataset are provided in the manuscript Rossi et al. (2025). 

Rossi RK, Richardson PW, Cavagnaro DB, Lukashov SG, Miller ME, Lindsay DN (2025) Predicting potential postfire debris-flow hazards across California prior to wildfire. International Journal of Wildland Fire. https://doi.org/10.1071/WF24225