Parent Layer: CalFire Timber Management and Hazard Zones

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Description: January, 2017 UpdateTier 2 High Hazard Zones were updated in January of 2017 to incorporate the full 2016 Aerial Detection Survey. ___________________________________________________________________________________________________________October, 2016 UpdateTier 2 High Hazard Zones were updated in October, 2016 with the May, 2016 Aerial Detection Survey of mortality flown by Region 5 USFS and with signigicantly improved critical infrastructure. Outreach to utilities during the spring of 2016 resulted in a much improved spatial data layer of utilities' critical infrastructure, one scoring component of Tier 2 High Hazard Zones. _______________________________________________________________________________________________________________Areas with elevated tree mortality and high fire threat that are a hazard to public safety, community assets, and related infrastructure represent the primary focus of these zones. CAL FIRE mapped Tier Two High Hazard Zones through a risk assessment model that scored watersheds based on amont of risk (hazard) and the amount of asset to be protected. We used the National Hydrography Dataset Watershed Boundaries (WBD) hydrologic unit code (HUC) 12 watersheds. These are the smallest consistently delineated watersheds in California and the average around 24,000 acres.In this model, the hazards were: number of dead trees (take from the USFS Aerial Detection Survey, 2015), acres of Tier One High Hazard Zones, and fire threat -- represented in the Sierra Nevada by WHRTYPE and fire return interval departure (USFS FRID, 2014) and in other areas of the state by CAL FIRE's Firethreat layer (FRAP, 2005). The assets to be protected were: amount of Critical Infrastructure, represented by roads, communities, recreation facilities, communications); water related natural resources (represented statewide by acres of riparian and in the Sierra Nevada by acres of riparian and montane meadows); and amount of water infrastructure, represented by water conveyances, and water storage facilities. Each hazard and each asset was scored individually, and an overall composite score was achieved. The overall scores for hazard and assets were ranked and then also combined for an overall score. For more information on the datasets used and the scoring methodology, please contact kelly.larvie@fire.ca.gov. Field review and revision is needed to refine and finalize HHZ areas. These zones will be periodically updated to relfect new mortality or infrastructure assets at risk.

Copyright Text: CAL FIRE

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