New IN-PREP Video: Modelling Evacuation Due to HAZMAT Incident

You can now watch the latest IN-PREP video presenting the evacuation scenarios modelled and analysed for the first IN-PREP TTX in Spoleto, Italy. The presentation was made by IN-PREP partners Lazaros Filippidis, Peter Lawrence and Anand Veeraswamy from the Fire Safety Engineering Group of the University of Greenwich. You can watch the video here.

IN-PREP has successfully modelled the evacuation part of a small town due to a HAZMAT incident for the first IN-PREP TTX. The data was modelled and analysed using the urbanEXODUS model with two causes of evacuation stemming from overturning of trucks, one containing 20,000 litres of chlorine and the second containing 8,000 litres of LPG. The model was used to simulate 32 variations or what-if scenarios which arose from the rate of release in the case of Chlorine and incident types in the case of LPG, combined with day and night scenarios and three different weather conditions.

One evacuation scenario was examined in particular detail. The procedure was based on weather conditions on the 19th July 2018 with a chlorine release escaping at 0.015kg per second for 80 minutes, taking place with a north/northwest wind in the day time. The accident occurred at the southwest part of the town escaping towards the centre, as the chlorine escapes numerous exit and refuge locations are identified both in the vicinity of the accident and the greater town. The scenario was implemented using real time analysis of the chlorine’s movements through the town and how the population moved in accordance with this. The simulation was then replayed in order to determine different aspects of evacuation based on the same criteria.

The results indicate that 5,237 citizens out of the area’s 5,790 population were successfully evacuated or reached safety in 89 minutes. At this point the conditions were deemed safe and the evacuation was called off. 6,897 persons in the town were notified by the automated call system, illustrating the effectiveness of the notification system as not only reaching the population of those affected, but also by reaching wider than its proposed area ensuring that all affected parties are being reached. The results showed an integration between IN-PREP and the local fire department with 131 people in the town being notified by the fire service directly.