Annex 6: Road and Bridge Infrastructure Vulnerability Assessment (RBIVA) Guidelines 569 character, magnitude and rate of climate change and variation to which a system is exposed, its sensitivity and its adaptive capacity. Some practical definitions of vulnerability ratings and the corresponding scoring system are provided below : a. Very High (Score 1)- characterized by a facility often subjected to hazardous events and for which the countermeasures are inadequate. Hazardous events may occur more than once per year. b. High (Score 2) – characterized by a facility moderately subjected to hazardous events and for which the countermeasures are inadequate. Hazardous events may occur once in every 1-3 years c. Moderate (3) – a facility moderately subjected to hazardous events and for which the countermeasures are marginally inadequate. Hazardous events may occur once in every 3-7 years d. Low (4) - a facility not normally subjected to hazardous events and for which the countermeasures are adequate. Hazardous events may occur once every 7-20 years 3. Disaster Risk is defined as the potential disaster losses in lives, health status, livelihood, assets and services, which occur over some specified future time period. The main approaches to mitigating disaster risks involve a wide range of interventions aimed at lowering if not totally eradicating the impact of losses. The impact of losses can be rated according to the following scale : a. Devastating – the facility is damaged beyond habitable use, repair or restoration and normally characterized by multiple fatalities b. Severe – the facility is partially damaged but remains intact. Some components are damaged beyond repair. The facility may be closed for a period of up to two weeks and some portions may be closed for an extended period of at least one month. May be characterized by some fatalities and major injuries. c. Moderate – the facility is temporarily closed and unable to operate, but can continue without interruption of more than one day. While some components are damaged, the majority of the facility remains unaffected. May be characterized by minor injuries.