Key Steps for Effective Disaster Site Arrangement and Victim Evacuation

When disaster strikes, the first few hours are critical. Whether it’s an earthquake, industrial accident, or mass casualty incident, how emergency responders organize the scene can mean the difference between life and death. Effective disaster site arrangement ensures that victims receive timely medical care, rescue operations proceed smoothly, and resources are utilized efficiently. This guide walks through the essential steps for setting up disaster site operations, establishing first aid posts, and implementing a pre-hospital phase checklist that saves lives.

Setting up disaster site operations 🔗

The initial moments after a disaster are chaotic, but trained responders follow a systematic approach to bring order to the scene. According to the National Library of Medicine, all disasters are fundamentally local events-first responders from the immediate jurisdiction are always the first to arrive and begin operations. This makes proper site setup procedures essential knowledge for every emergency response team.

Confirm the disaster and assess its nature 🔗

Before mobilizing resources, responders must confirm the disaster has occurred and quickly assess its type and extent. This involves gathering information about what happened (earthquake, explosion, chemical spill), the approximate number of casualties, and the geographic spread of the incident. Accurate initial assessment prevents both under-response and over-deployment of resources.

The assessment should determine whether this qualifies as a mass casualty incident (MCI)-a situation where the number and severity of patients overwhelm normal medical resources. The World Health Organization defines these as events characterized by quantity, severity, and diversity of patients that rapidly exceed local capacity for comprehensive care.

Identify active risks and hazards 🔗

Scene safety comes before patient care. Responders must identify ongoing hazards such as unstable structures, fire, chemical exposure, secondary explosions, or active threats. No rescue operation should begin until safety assessment is complete. This includes checking for downed power lines, gas leaks, structural instability, and environmental hazards.

For incidents involving violence or terrorism, the Hartford Consensus recommends applying the THREAT acronym: Threat suppression, Hemorrhage control, Rapid Extrication to safety, Assessment by medical providers, and Transport to definitive care. Responder safety is paramount-injured responders cannot help victims and add to the casualty count.

Establish access routes and perimeters 🔗

Clear access routes must be established for incoming emergency vehicles and outgoing patient transport. This includes designating entry and exit points for ambulances, fire trucks, and other emergency vehicles. Creating security perimeters keeps unauthorized individuals out while allowing essential personnel and equipment to flow efficiently.

The Department of Homeland Security emphasizes the importance of establishing clear communication channels and operational coordination early in any disaster response. This means setting up a command post, assigning roles using incident command structure, and ensuring all responders understand the overall plan.

First aid post setup 🔗

Once the scene is secured and initial assessment complete, establishing effective first aid posts becomes the priority. These temporary treatment areas serve as the critical link between rescue operations and hospital care.

Selecting the optimal location 🔗

First aid posts should be positioned in safe zones away from immediate hazards but close enough to the incident scene for efficient patient movement. Consider factors like wind direction (especially for chemical or smoke incidents), terrain stability, available lighting, and protection from weather. The location should accommodate ambulance access for patient loading and transport.

Key location criteria include: safety from ongoing hazards, sufficient space for patient staging areas, accessibility for ambulances and supply vehicles, visibility for victims seeking help, and proximity to water and power sources when available. Multiple first aid posts may be necessary for large-scale incidents spread across wide geographic areas.

Initiating triage operations 🔗

Triage-the process of sorting patients by injury severity-begins immediately at the first aid post. The START (Simple Triage and Rapid Treatment) system is the most widely used approach in the United States. Developed in 1983 by Hoag Hospital and Newport Beach Fire Department, it allows rescuers with basic first-aid skills to quickly categorize patients.

START triage uses four color-coded categories:

BLACK (Deceased/Expectant): Patients with injuries incompatible with life or who are not breathing even after airway opening attempts. These patients are not moved to collection points.

RED (Immediate): Severe injuries with high survival potential if treated quickly. These patients are prioritized for transport and treatment. Criteria include respiratory rate greater than 30, absent radial pulse or capillary refill greater than 2 seconds, or inability to follow simple commands.

YELLOW (Delayed): Serious injuries that are not immediately life-threatening. These patients can wait for treatment while RED patients are addressed first.

GREEN (Walking Wounded): Minor injuries. These patients can often walk themselves to designated collection areas.

The memory aid “RPM: 30-2-can do” helps responders remember decision points: Respiration rate of 30, Perfusion (radial pulse or 2-second cap refill), and Mental status (can they follow commands).

Providing immediate medical care 🔗

Treatment at first aid posts focuses on stabilization rather than comprehensive care. According to ASPR TRACIE, simple actions to control bleeding and manage breathing issues save lives and should be part of on-scene care. This includes hemorrhage control through direct pressure, tourniquet application, and wound packing with hemostatic agents.

The SALT (Sort, Assess, Life-saving interventions, Treatment/Transport) triage method adds simple life-saving techniques during the triage phase itself. When assessing a victim with life-threatening injuries, responders can perform quick interventions like controlling major hemorrhage, opening airways, or needle decompression before moving to the next patient.

For pediatric patients, the JumpSTART modification accounts for different normal respiratory rates in children. This tool is designed for children up to age eight and includes provisions for giving five rescue breaths to apneic children with a pulse before assigning triage categories.

Pre-hospital phase checklist 🔗

A comprehensive pre-hospital checklist ensures no critical steps are missed during the intense pressure of disaster response. The World Health Organization recommends systematic implementation of priority actions to facilitate timely and effective response.

Site security and safety measures 🔗

Securing the disaster site involves establishing perimeter control, identifying and mitigating ongoing hazards, and ensuring responder safety. This includes assigning personnel to monitor for secondary threats, maintaining communication with law enforcement for scenes involving violence, and implementing decontamination procedures when chemical or biological hazards are present.

Critical security actions: establish inner and outer perimeters, assign security personnel to access points, brief all responders on identified hazards, implement accountability systems for personnel entering hazardous zones, and maintain escape routes for all workers.

Marking first aid locations and staging areas 🔗

Clear visual markers help direct both victims and responders to appropriate locations. Use standardized signage, colored flags, or lights to identify first aid posts, patient staging areas (organized by triage category), ambulance loading zones, and command posts. Consistency in marking across agencies improves coordination and reduces confusion.

Designated areas should include: triage point for initial patient sorting, treatment areas organized by triage category, ambulance staging and loading zones, supply and equipment stations, rest areas for responders, and family reunification points.

Rescue and evacuation procedures 🔗

According to disaster response experts, the primary objective during disaster response is providing immediate short-term assistance while moving patients toward resources offering more comprehensive care. This requires coordinated evacuation procedures that prioritize the most critical patients.

Evacuation priorities follow triage categories: RED patients transport first to appropriate trauma centers, YELLOW patients follow once RED patients are evacuated, and GREEN patients may be transported by non-emergency vehicles to lower-acuity facilities. Patient tracking systems should document who was transported, when, and to which facility.

For mass casualty events, OSHA guidelines emphasize that response organizations must adapt their procedures to the severity and geographic spread of the incident. Mutual aid agreements with neighboring jurisdictions may need activation when local resources are overwhelmed.

Communication and documentation 🔗

Maintaining clear communication channels between field operations, hospitals, and emergency management is essential. This includes regular situation reports to the command post, advance notification to receiving hospitals about incoming patients and their conditions, and coordination with mutual aid resources.

Documentation during the pre-hospital phase creates the record needed for patient tracking, quality improvement, and after-action reviews. At minimum, document patient triage categories, interventions performed, transport times, and destination facilities.

Transitioning from pre-hospital to hospital care 🔗

Effective disaster site arrangement creates a seamless flow from rescue to definitive care. Patients move from the incident scene through triage and first aid posts, then to ambulance loading zones for transport to appropriate medical facilities. FEMA coordinates federal resources through Emergency Support Functions, with ESF #8 specifically addressing public health and medical services during major disasters.

The transition succeeds when hospitals receive advance warning about incoming patient numbers and acuity levels, transport resources are matched to patient needs, and communication between field teams and receiving facilities remains constant throughout the event.

What do you think? How prepared is your community to implement these disaster site procedures? What additional training or resources would help local responders manage mass casualty events more effectively?

References

1. https://www.ncbi.nlm.nih.gov/books/NBK560710/
2. https://www.ncbi.nlm.nih.gov/books/NBK459369/
3. https://asprtracie.hhs.gov/technical-resources/33/pre-hospital-mass-casualty-triage-and-trauma-care/0
4. https://www.dhs.gov/topics/disasters
5. https://www.who.int/docs/default-source/documents/publications/hospital-emergency-response-checklist.pdf
6. https://www.osha.gov/emergency-preparedness/getting-started