The Frontline of Urban Disasters: How to Prepare for Linear Precipitation Zones, Inland Flooding, and Extreme Heat

Hello! This is SONAEAREBA.

This time, I will concisely organize the latest trends in urban disasters and
future challenges based on primary data
and field perspectives, and summarize
action guidelines that are immediately useful.

I will explain the implementation points for preparedness and disaster mitigation
across urban flooding, extreme heat, earthquakes, and digital disaster prevention.

What is happening now

Extreme heavy rainfall is increasing in the long term due to the effects of global warming,
and cases of linear precipitation zones directly hitting
urban functions are continuing. On the other hand, 2024 saw record-breaking

extreme heat, with heatstroke-related deaths and ambulance transports
reaching record highs, making urban heat risk a
structural problem. The damage estimates for a Tokyo inland earthquake were
revised in 2022, and while taking into account the progress of fireproofing buildings,

the compound effects of shaking, fire, and paralysis of urban functions
continue to be presented as a major risk.

Linear Precipitation Zones and the Wall of Prediction

While the capture rate for 12-hour linear precipitation zone forecasts is
improving, the accuracy rate as of 2025
is about 14%, falling short of the target, and operations that
avoid missing events while accepting false alarms
are continuing. Although post-event understanding and

verification are becoming more sophisticated through satellites and high-resolution observation,
how this information is conveyed to urban residents and the design of behavioral change
are challenges. I propose combining the monitoring of short-duration rainfall
and the use of short-term precipitation forecasts with the concretization of

local evacuation decision criteria. Reference link:
Yahoo News



Linear precipitation zone forecast accuracy rate 14%
failed to reach the target of about 25%. However, the capture rate was 71%, exceeding the target

Urban Flooding and Basin Flood Control

Inland flooding is likely to occur due to heavy rain exceeding sewage treatment capacity,
and the transition to

"Basin Flood Control 2.0" which combines storage,infiltration, retarding basins, and residential land measures across the entire basin
is accelerating. Efforts to clarify the division of roles among the national government,

local governments, the private sector, and residents, and to visualize goals and roadmaps
are progressing, and the

"personalization" of stakeholders is key.I promote implementation through both micro-measures such as house waterproofing,

exterior permeability, and rain gardens, and regional projects. Reference link:
Ministry of Land, Infrastructure, Transport and Tourism website



"Formulating 'Basin Flood Control Project 2.0'
- Announcing the direction of measures for rivers and basins based on climate change -"

Heat Island and Heat Adaptation

Heat island countermeasures such as urban greening, high-reflectivity paving, and the formation of wind paths
are locally effective and need to be advanced in integration with
district design and building renewal. Heatstroke casualties in the workplace in 2024
were the highest since statistics began, and


heat adaptation in the work environment(measurement, breaks, shade, water supply, air conditioning)
is a management issue for companies.I will work on suppressing excess deaths in summer from both the aspects of
developing community cooling hubs and individual behavioral change.

Earthquake Risk and Urban Renewal

The latest damage estimates for Tokyo, based on scenarios such as a direct hit to the southern part of the city center,
clearly indicate compound damage from building collapse, fire, and lifeline disruption,
and disclose information directly linked to regional disaster prevention plans and individual
preparedness. While fire risk is relatively reduced due to the progress of fireproofing and
seismic retrofitting, the assessment that human damage due to shaking is the main factor remains unchanged.

I prioritize proposing pre-diagnosis of condominiums and offices,
distributed stockpiling, and updates to measures for people unable to return home.

Disaster Prevention DX and Digital Twins

The national annual plan sets disaster prevention infrastructure, lifeline resilience,
digital utilization, and strengthening public-private partnerships as pillars,
and continues investment through acceleration measures. Through the 3D city model PLATEAU,
disaster prevention DX service maps, and SIP Smart Disaster Prevention,

optimization of damage, evacuation, and supplies using digital twins
has entered the implementation stage. The cross-sectional implementation of infrastructure DX
and the development of data linkage platforms will accelerate decision-making during compound disasters.

Recent Actions

• Update hazard maps and damage estimates, and share
  "criteria for evacuation behavior" with family and at work.
  
  

• Promote small-scale basin flood control such as waterproofing homes and offices,
  exterior permeability, rainwater storage, and emergency pumps.
  
  

• In summer, incorporate work plans, breaks, and cooling hubs,
  and thoroughly manage heatstroke risk by visualizing WBGT, etc.
  
  

• Consider the use of local disaster prevention DX services and 3D city models,
  and identify bottlenecks in evacuation and logistics in advance.
  

Future Challenges

• Optimization of prediction accuracy and communication:
  Balance design between avoiding misses and suppressing false alarms,
  and translation into resident behavior. Above all,
  it is important to avoid missing events.
  

• Urban Renewal and Funding:
  Area-wide investment and continuity of maintenance for Watershed Management 2.0, spanning both inland and external waters.
  

• Social Implementation of Heat Adaptation:
  Standardization of operations and strengthening of outreach in workplaces, schools, and facilities for the elderly.
  
  

• Data Collaboration and Governance:
  PLATEAU integration, privacy considerations, and ensuring interoperability in actual operations.
  

Summary

Urban disasters are manifesting as complex crises where extreme heavy rain, intense heat, and the risk of a major earthquake directly beneath the capital overlap, causing the disruption of urban functions.
While monitoring for linear precipitation zones is advancing, there are limits to the accuracy of predictions; the immediate focus is on balancing operations that accept false alarms to avoid missing events with the design of resident behavior.

For inland flooding, it is effective to implement 'small-scale watershed management' by combining storage, infiltration, retention, and residential measures on an area-wide basis, such as household water-stopping measures and permeable exterior paving.
For extreme heat and the heat island effect, heat adaptation in workplaces and communities (cooling hubs, WBGT visualization, rest and hydration rules) is an urgent priority, as labor accident statistics are also showing a worsening trend.

As indicated by the Tokyo Metropolitan Government's damage projections, preparation for shaking, building collapse, and lifeline disruption is the top priority for earthquakes, with updates to seismic retrofitting, decentralized stockpiling, and measures for those unable to return home being key.
Centered on disaster prevention DX and 3D city models (PLATEAU), a trend is beginning to integrate the optimization of evacuation, logistics, and resource allocation into daily operations.

In conclusion, based on the premise of the limits of prediction accuracy,
'personalizing'behavioral standards and regional cooperation, along with the integration of digital and on-site measures, will directly lead to the minimization of damage from urban disasters.

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