a = estimated # of days to restore 4 No loss of service even from Essential for the operation of some part – “most regular service area-wide probable” scenario of mains gas system for the city; b = % of critical assets affected 3 Loss factor of 1-25% from most Essential for the functioning of some – probable” scenario other critical asset (say, a then GCA loss factor = a x b … 2 Loss factor of 25-100% from – (Example 1.5 day’s loss of probable” scenario Service may be provided either from the “most – asset itself or via a designated service for 10% of critical assets alternative/back-up. in city = loss factor of 15%; 3 1 Loss factor of 100-200% from – days’ loss of service for 50% of probable” scenario “most critical assets in city = loss factor of 150%) 0 Loss factor >200% from – “most probable” scenario 8.5.4 Cost of restoration of Likely cost of lost service and 5 No loss of service. This assessment is designed to help establish – service restoration as % of annual billed the return on investment from investing in revenue hardening the relevant infrastructure, in 4 - 10% of annual billed revenue reducing the burden of restoring the city to normal life after a disaster. 3 10-15% – 2 15-25% – 1 25-50% – 0 - >50% of annual billed revenue. 8.6 Transportation 8.6.1 Road service from Road loss factor if: 5 No loss of service even from Loss of service refers to general road – – – “most road system at risk of loss severe” scenario mobility. It primarily refers to damage to road surfaces or bridges and tunnels, or from a = miles of major road network fallen debris from buildings, cliffs etc. for city and surrounding area at 4 No loss of service even from – “most risk of becoming impassable to probable” scenario any type of vehicle after event 3 Loss factor of 1-25% from most – b = likely number of days probable” scenario estimated before reopening, 2 Loss factor of 25-100% from – probable” scenario “most
a = estimated # of days to restore regular service area-wide b = % of critical assets affected … then GCA loss factor = a x b (Example – 1.5 day’s loss of service for 10% of critical assets in city = loss factor of 15%; 3 days’ loss of service for 50% of critical assets in city = loss factor of 150%) 4 – No loss of service even from “most probable” scenario 3 – Loss factor of 1-25% from most probable” scenario 2 – Loss factor of 25-100% from “most probable” scenario 1 – Loss factor of 100-200% from “most probable” scenario 0 – Loss factor >200% from “most probable” scenario Essential for the operation of some part of mains gas system for the city; Essential for the functioning of some other critical asset (say, a Service may be provided either from the asset itself or via a designated alternative/back-up. 8.5.4 Cost of restoration of service Likely cost of lost service and restoration as % of annual billed revenue 5 – No loss of service. 4 - 10% of annual billed revenue 3 – 10-15% 2 – 15-25% 1 – 25-50% 0 - >50% of annual billed revenue. This assessment is designed to help establish the return on investment from investing in hardening the relevant infrastructure, in reducing the burden of restoring the city to normal life after a disaster. 8.6 Transportation 8.6.1 Road – service from road system at risk of loss Road loss factor – if: a = miles of major road network for city and surrounding area at risk of becoming impassable to any type of vehicle after event b = likely number of days estimated before reopening, 5 – No loss of service even from “most severe” scenario 4 – No loss of service even from “most probable” scenario 3 – Loss factor of 1-25% from most probable” scenario 2 – Loss factor of 25-100% from “most probable” scenario Loss of service refers to general road mobility. It primarily refers to damage to road surfaces or bridges and tunnels, or from fallen debris from buildings, cliffs etc.
Resilience%20Scorecard%20Updated%20V2%20-%20April%2030th%202015.docx