EAM.6:4.3 - Follow service through recovery

Divide the disturbance into intervals at which demand, usable contribution or restoration changes. Use times to usable service, including the necessary access, work, testing and return conditions. A repair-completion estimate alone may omit the time before the contribution can actually be used.

For each interval, compare required service with supported available contribution. Where an additive bound is applicable, the positive difference is the deficit. Multiply a constant deficit by the interval length to obtain the reserve volume or resource needed during it. Carry the remaining usable reserve forward; test both its deliverable rate and its remaining amount. Account for other users’ simultaneous demands on it.

Credit replenishment only when its route, rate, timing and operating conditions are supported. If flows or demand vary materially within an interval, refine the intervals or obtain an appropriate time-dependent result. A total-volume comparison alone cannot establish pressure, quality or other delivery conditions.

The service requirement may include an allowed interruption, minimum contribution or restoration deadline. Apply that actual criterion to each interval. Report where and for how long it fails. Keep evidence for restoration timing separate from a proposed recovery plan: an unqualified time leaves the dependent conclusion conditional.