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2021 Multijurisdictional Local Hazard Mitigation Plan Table 16-3. Loss Estimates for Fire Hazard Severity Zones Exposed Value Loss Value Loss as % of Total Planning Area Replacement Value Moderate FHSZ Loss = 1% of Exposed Value $1.9 Billion $83,256,446 0.04% Loss = 10% of Exposed Value $832,564,462 0.43% Loss = 30% of Exposed Value $2,497,693,386 1.30% Loss = 50% of Exposed Value $4,162,822,310 2.17% Very High FHSZ Loss = 1% of Exposed Value $8.3 Billion $19,255,897 0.01% Loss = 10% of Exposed Value $192,558,971 0.10% Loss = 30% of Exposed Value $577,676,912 0.30% Loss = 50% of Exposed Value $962,794,854 0.50% Additionally, heavy vehicle traffic during incidents and in post-fire recovery and rebuild can have significant impact on road surfaces. The following critical facilities are located in very high and high severity zones and their vulnerability could complicate response and recovery efforts during and following an event:  Hazardous Materials and Fuel Storage—During a wildfire event, these materials could rupture due to excessive heat and act as fuel for the fire, causing rapid spreading and escalating the fire to unmanageable levels. In addition, they could leak into surrounding areas, saturating soils and seeping into surface waters, and have a disastrous effect on the environment.  Communication Facilities—If these facilities are damaged and become inoperable, it would exacerbate already difficult communication in the planning area. 16.4.4 Environment Fire is a natural and critical ecosystem process in most terrestrial ecosystems, affecting the types, structure, and spatial extent of native vegetation. However, in some circumstances it can also cause severe environmental impacts, such as the following:  Damaged Fisheries—Critical fisheries can suffer from increased water temperatures, sedimentation, and changes in water quality.  Soil Erosion—The protective covering provided by foliage and dead organic matter is removed, leaving the soil fully exposed to wind and water erosion. Accelerated soil erosion occurs, causing landslides and threatening aquatic habitats.  Spread of Invasive Plant Species—Non-native woody plant species frequently invade burned areas. When weeds become established, they can dominate the plant cover over broad landscapes, and become difficult and costly to control. 16-12 High FHSZ Loss = 1% of Exposed Value $2.4 Billion $24,474,690 0.01% Loss = 10% of Exposed Value $244,746,900 0.13% Loss = 30% of Exposed Value $734,240,700 0.38% Loss = 50% of Exposed Value $1,223,734,500 0.64%