With global climate change and the increasing frequency of extreme weather events, flooding has become one of the most costly natural disasters faced by industrial and commercial facilities. FM Data Sheet 1-40 (Flood) provides a scientific basis and engineering framework for flood loss prevention design, aiming to ensure facilities remain resilient and operational during flood events.

As a solution provider of FM 2510-certified flood doors, Liansuo Construction Technology Co., Ltd. adheres to FM standards as the foundation, while tailoring solutions to project-specific conditions. We deliver full lifecycle flood protection services covering risk assessment, system design, installation, and maintenance.

I. Design Principles: From Risk Awareness to Engineering Implementation

FM 1-40 emphasizes that the first step in flood design is defining the Design Flood Elevation (DFE) to establish the protection boundary. This elevation should not only reference historical flood records but also incorporate hydrological modeling, topographic data, and tools such as the FM NatHaz Toolkit.

Based on this foundation, site-specific flood risk assessments should be conducted, including:

• Hazard identification: river flooding, urban inundation, storm surge, etc.

• Vulnerability analysis: flood pathways, elevation of entry points, structural weak spots.

• Consequence evaluation: equipment and inventory damage, business interruption, recovery cost.

At the early stage of each project, Liansuo integrates FM 1-40 methodologies with flood door selection, ensuring the protection height, door structure, and sealing grade match actual risk conditions.

II. Engineering Strategies: Multi-Layered Defense System with Flood Door Applications

1. Site-Level Protection (Strategy A)

Where site conditions allow, FM-certified flood doors can serve as continuous and permanent floodwalls or levees to establish the first line of defense. High-reliability pumping systems should also be installed to prevent the “bathtub effect.”

At critical access points and gates, FM-certified flood doors can be rapidly closed when flood warnings are issued, ensuring continuity with floodwalls. For example, at logistics entrances of chemical plants, flood doors can function as operable protection segments — providing daily access in normal conditions while forming a fully sealed barrier during floods.

2. Building-Level Protection (Strategy B)

For production or storage facilities located in flood-prone zones, in addition to enhancing wall and floor watertightness, FM-certified flood doors should be installed at all exterior doors, loading bays, and ventilation openings. This ensures structural stability and zero leakage under hydrostatic pressure.

To mitigate the risk of municipal drainage system backflow, flood doors can also be applied internally to segment building zones. For example, small flood doors may be installed at restrooms or low-level corridors to prevent water intrusion into core production areas.

3. Localized and Equipment Protection (Strategy C)

Where overall protection is not feasible, flood doors can be installed at entrances to critical rooms, forming an “internal defense line” to safeguard electrical rooms, control centers, or server facilities.

III. Core Value of FM Certification

FM certification (ANSI/FM 2510) is not only a recognition of product performance but also a guarantee of reliability under extreme flood scenarios. Certification testing covers hydrostatic pressure, hydrodynamic flow, debris impact, and velocity — with full-scale validation — ensuring that products maintain both sealing and structural integrity at maximum design loads.

Conclusion

FM 1-40 serves not only as an engineering technical standard but also as a management guideline for resilient business continuity.

Liansuo Construction Technology Co., Ltd. will continue to apply FM standards as the foundation, integrating FM-certified flood doors into diverse scenarios and strategies. Through scientific assessment, precise design, and professional execution, we build multi-layered, sustainable, and verifiable flood protection systems. This transforms flood risk from an uncontrollable threat into a manageable engineering challenge — safeguarding facility safety and operational continuity.