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Double trouble: Floods and COVID-19 have merged to pose great danger for Timor-Leste

Timor-Leste is reeling after heavy rain caused and landslides over the Easter weekend, killing at least 42 people. Rates of COVID-19 in Timor-Leste are also on the rise. Together, these hazards threaten to interact with deadly consequences.

Our has assessed the likelihood of natural hazards coinciding with, and influencing, the COVID-19 pandemic. Unsurprisingly, we found temporary relaxations of COVID-19 restrictions during natural disasters are likely to cause large spikes in infection rates.

In Timor-Leste's capital Dili, the floods and the pandemic have combined to form a dangerous dynamic. Flood damage prompted authorities to COVID-19 restrictions. Evacuees are gathered in where social distancing may be challenging. Flooding to some COVID treatment centers and put extra pressure on Timor-Leste's .

The situation offers lessons for other populated, flood-prone cites battling the COVID-19 pandemic. Natural hazards will, of course, persist throughout the pandemic. Better understanding the complex interactions between double disasters will help societies and systems become more resilient.

Dili: a recipe for disaster

On April 3 and 4, more than 400mm of rain was recorded in Dili. Floodwater and debris washed into populated areas. indicate at least 42 people died and 13,554 were displaced. Nearby Indonesian islands were also hit and at least were reported.

Several natural and human factors combine to make Timor Leste vulnerable to flooding.

The country's mountainous topography (see image below) encourages rainfall and creates steep stream systems that rapidly transfer floodwater into adjacent populated areas. Weak rocks and steep catchments are highly susceptible to landslides.

Flowing water interacts with the mountains, causing sediment to accumulate in the shape of a fan or cone. This and sediment into central Dili. Also, rampant deforestation and development has increased and stream discharge during heavy rain.

Rapid and largely uncoordinated population growth, particularly in Dili, has concentrated vulnerable populations into flood plains and low-elevation coastal areas highly exposed to flooding.

Other factors increasing the flood risk in Dili include:

• concrete structures that don't allow water to sink into the ground
• multi-pylon concrete bridges that trap flood debris
• urban drainage channels choked with sediment and urban waste.

More broadly in the region, three climate features combined to create ideal conditions for the recent high rainfall and tropical storms: the , the and a

The COVID combination

Dili is frequently hit by large floods—most recently in . But this time, the disaster coincided with in Timor Leste's COVID-19 infection rate.

In late March this year, the number of new daily cases in Timor-Leste was rising quickly. , there were 70 new daily cases, bringing the total confirmed cases to more than 1,000.

Even without these twin disasters, many in Timor-Leste already lacked access to medical services and lived below the poverty line. COVID-19 restrictions exacerbated .

Then the floods hit. They left thousands homeless with severely restricted access to food and clean water. Roads and bridges collapsed. Crops were destroyed and firewood collection—essential for cooking—has been difficult in some areas.

The floods disrupted a COVID-19 lockdown in Dili, and forced people into crammed . of a national medical storage facility damaged supplies. The national laboratory also flooded and a COVID-19 isolation facility was temporarily evacuated.

During floods, the risks of waterborne and vector-borne disease outbreaks . Should this occur, Timor-Leste's fragile health system would be under even greater pressure.

The first batch of COVID-19 vaccines arrived in Timor Leste on April 5 and the vaccination program has despite the flood-related challenges.

A global problem

Many global cities are vulnerable to multiple interacting hazards like those now faced by Timor-Leste. Our analysis suggests 16 of the world's , comprising 5% of the world's population, have similar geology, population density and/or land use to Dili and could face similar multiple disasters. These cities include , and .

In emergency situations, the need for disaster response and recovery may justify temporarily lifting COVID-19 restrictions. But pandemic measures must be reinstated as soon as possible. Our modeling, pictured below, suggests when COVID restrictions are lifted in response to a disaster, infection rates ascend rapidly.

What can be done?

Potential solutions are more likely to be effective when they involve multiple groups working together. This includes international and local experts, diverse support agencies and affected communities.

identifies ways to improve disaster preparedness and response in a COVID-19 world. They include:

• developing scenarios and forecasts to deal with the interaction of multiple hazards, including COVID-19
• using to assist and empower local disaster responders
• evacuation centers that allow for social distancing
• storing supplies of personal protective gear and medical equipment in areas less exposed to natural hazards
• mobile teams of humanitarian workers, volunteers and medical staff that can respond to natural disasters in COVID-affected regions.
• Finally, measures must be taken to reduce the risks posed by future disasters. This must be done in culturally informed ways and includes:
• improving land and water management
• land-use planning that considers disaster risk
• urban clean-up after events such as floods.

Such actions are crucial in developing nations such as Timor-Leste, where urban development can amplify natural hazards with tragic results.