Modelling how to repair distribution networks after an earthquake

Problem formulation

In this year’s problem five different Damage Scenarios are considered in which a set of pipes in a drinking water network are either broken (require isolation and replacement), or have leakages (require only reparation). For this battle, six (6) criteria are considered in the problem formulation:

1. Time that the hospitals (2 per scenario) and the hydrants (2 per scenario) are without supply,
2. Rapidity of recovery (time until the system recovers permanently 95% of its functionality),
3. Resilience Loss (accumulated loss of functionality = area under functionality),
4. Average time each consumer (node) is without service,
5. Number of consumers (nodes) without service for more than 8 consecutive hours, and
6. Volume of water lost during the next 7 days after the event

Here functionality is estimated as the sum of all demands of all nodes for a particular solution of a damage scenario in relation to the sum of all demands of the system when no damages have occurred, for each time step.

Solution TEAM Castro-Gama, Quintiliani & Santopietro

The solution proposes the order in which the pipes need to be repaired by 3 different crews, for each of the Damage Scenarios.

Results for 2 different algorithms (A Many Objective Optimization and a Greedy algorithm) and 4 different preventive engineering interventions considered (increasing or decreasing pumping capacity and storage capacity) are presented in the following video together with the Methodology and proposed solution.

Video – 08:42

Proposal for the Battle of Post-Disaster Response and Rehabilitation (BPDRR)