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Hurricane Florence showed why coastal resilience cannot be reduced to wind speed. Charles Boney’s account of the 2018 storm describes a slow-moving system that kept raining after soils were saturated, sending floodwater well beyond the immediate shoreline. The practical answer is to design for the full water path: raise occupied floors where appropriate, plan drainage that still has a failure route, detail windows and doors against wind-driven rain, keep essential equipment out of vulnerable basements, and involve architecture, civil engineering and facilities staff before and after a disaster.
Boney reported 34 inches of rain in Swansboro, historic flooding in New Bern and destructive flooding reaching the Triangle region in his 2019 Building Design + Construction article. Those figures are the article’s reported observations, not an independent verification here. They nevertheless illustrate the central lesson: a building can be above a mapped flood area and still suffer severe damage from rainfall, blocked drainage, surge, or water driven through openings.
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Florence lingered over warm September water and moved slowly enough to deliver prolonged rainfall. Boney describes land that was already saturated, followed by flooding that affected communities far inland. The event challenged a common design assumption: that keeping wind out is the primary resilience task. In practice, water may arrive as rainfall on the roof, runoff across a site, groundwater pressure, storm surge, or wind-driven rain forced through a window or door assembly.
The account is a practitioner’s record of projects and recovery work, not a controlled study proving that one measure will work at every site. Local topography, soil, tide, drainage capacity, building use and construction quality all change the outcome. Use the lessons as questions for the design team, then confirm decisions against current flood maps, adopted codes, hazard requirements and a site-specific analysis.
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How should a site be planned when drainage can fail?
Start with finished-floor elevation and a map of every route water could take if the intended drainage system is blocked, overtopped or damaged. Raising a building is useful only when the surrounding grades, access routes and utilities are considered together.
Set the occupied floor above credible water paths
Boney reports that a new K–8 school site was raised four feet and remained high and dry during Florence. That is a project anecdote, not proof that a four-foot increase is universally adequate. A civil engineer should evaluate survey data, floodplain information, stormwater assumptions, freeboard requirements and the consequences of a larger event before a grade is selected.
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Elevation also affects accessibility, parking, fire access, ramps and neighboring properties. A raised pad that sends water toward a lower parcel can transfer risk rather than remove it. Detail transitions at entrances and service yards so the higher finished floor does not create a low point where water can collect against walls.
Design a second route for water
Conventional inlets, pipes, swales and detention areas have finite capacity. Debris can block an inlet; sediment can reduce a channel; surge can prevent an outfall from draining. The design question is not only “Where does normal runoff go?” but also “Where will excess water go when the preferred route is unavailable?” Provide deliberate overland flow paths, protect critical openings along those paths and keep emergency egress usable.
Boney describes visiting a school where floodwater ran through a gymnasium and warped the floorboards. The episode demonstrates why a drainage plan must be checked against interior consequences: a route that protects one structure may send water through another. Coordinate grading, landscape features, retaining walls and door locations on one drainage model rather than in separate drawings.
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| Hazard or failure | Design question | Coordination needed |
|---|---|---|
| Blocked inlets or culverts | Where does runoff flow when the inlet is closed? | Civil engineering, landscape and maintenance staff |
| Storm surge or high tailwater | Can the outfall drain, and what happens if it cannot? | Hydrology, floodplain and utility review |
| Water against entrances | Are thresholds, ramps and door swings protected? | Architect, envelope consultant and accessibility review |
| Flooding around equipment | What systems must remain operational and for how long? | Facilities, electrical and mechanical engineers |
How can windows and doors resist wind-driven rain?
Higher ground does not make an enclosure watertight. Wind can drive rain sideways and upward into joints, sill interfaces and thresholds. Boney recommends careful window-wrap and sill-pan detailing, including welded end dams, along with protected and waterproofed exterior doors.
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Windows: make the sill a drainage assembly
A sill pan should collect incidental water and direct it back to the exterior rather than into the wall cavity. End dams need to close the pan at both sides; Boney specifically calls for welded end dams. The exact membrane, sealant, fastener and integration with the window manufacturer’s system must be selected by the project’s architect or envelope specialist. A product listing alone does not establish that an assembly is suitable for a particular wall, exposure or code requirement.
Show the sequence in the details: rough-opening preparation, pan installation, end-dam continuity, jamb and head flashing, window placement, and the water-resistive barrier’s shingle-lapped connection. Require installers to follow the tested or approved assembly and document concealed work before it is covered. Inspection is especially important where multiple trades interrupt the drainage plane.
Doors: protect the lowest opening
Entry doors are often the lowest point in an exterior wall and receive concentrated runoff from roofs and sidewalks. Boney recommends overhangs or recessed entries, waterproof thresholds and sidewalks sloped away from doors. These measures reduce exposure but do not replace a complete wall and door-flashing design.
Check door operations during heavy rain scenarios: Will a raised threshold create an accessibility problem? Can a storm door, mat or debris block drainage? Does a canopy discharge water onto the threshold? Resolve those details in the drawings, and keep threshold drains and adjacent grading clear through the building’s maintenance plan.
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Should critical equipment be kept out of basements?
For buildings that must reopen quickly, the location of boilers, electrical gear, controls, pumps and emergency systems may matter as much as the strength of the structure. Boney recounts a public building with six feet of water in its basement. He worked with the owner to diagnose the entry, considered hydrostatic pressure with a civil engineer, and designed a well-point system powered by a generator. The longer-term plan moved boilers and electrical equipment out of the basement into an addition.
This is a case history, not a universal flood-remediation prescription. A well-point system, sump arrangement, flood barrier or relocation project must be designed for the site’s groundwater, soil, discharge permissions, maintenance capacity and electrical configuration. Temporary pumping without a safe discharge route can worsen erosion or send water into another part of the property.
Build a critical-systems hierarchy
- List functions that cannot stop. Include fire protection, emergency lighting, communications, refrigeration, medical support, security and data systems as applicable to the building.
- Map their dependencies. A generator is not useful if switchgear, fuel controls or ventilation are in the flood zone. Identify fuel, controls, cooling, network and access requirements.
- Choose elevation or protection for each component. Relocate vulnerable equipment where feasible; otherwise use engineered barriers, waterproof enclosures or sacrificial components with a documented replacement plan.
- Plan inspection and restart. Electrical and mechanical systems exposed to floodwater may require professional evaluation before energization. Include contact lists, lockout procedures and spare parts in the continuity plan.
The objective is not merely to keep a basement dry under ordinary storms. It is to preserve life safety and essential operations when water enters despite preventive measures.
What should architects and engineers do after a hurricane?
Recovery begins with a disciplined assessment, not immediate demolition. Boney identifies damage assessment, life-safety review, mold and mildew remediation, re-roofing, window replacement and prevention planning among the services architects may support after a disaster.
- Make the site safe. Coordinate with emergency authorities, isolate electrical hazards, document unstable elements and restrict access to contaminated or structurally compromised areas.
- Record the water story. Photograph high-water marks, flow paths, damaged finishes, blocked drains and equipment locations. Note dates, weather and whether systems were operating.
- Separate urgent stabilization from permanent work. Temporary roof covers, pumping and shoring protect the building while the team investigates causes and develops a durable scope.
- Investigate hidden damage. Moisture can remain in wall cavities, insulation, floor assemblies and mechanical chases after visible water is gone. Mold remediation and drying specifications should be prepared by qualified professionals.
- Turn findings into prevention. Update grading, openings, equipment locations, maintenance procedures and emergency contacts based on observed failure paths.
Owners often need one coordinated team rather than isolated reports. The architect can connect envelope and life-safety decisions; the civil engineer can analyze runoff, groundwater and hydrostatic pressure; mechanical and electrical engineers can address equipment and continuity; facilities staff can explain what can actually be maintained.
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How should owners compare resilience options?
There is no universal ranking of elevation, drainage, enclosure upgrades or equipment relocation. Compare options against the building’s exposure, function and recovery consequences.
- Water exposure: Is the site exposed to rainfall flooding, surge, groundwater, or several at once?
- Failure behavior: If a drain, pump or barrier fails, does water leave the building or concentrate at a critical opening?
- Envelope vulnerability: Are windows, doors, roof edges and penetrations detailed for wind-driven rain?
- Continuity: Which rooms, systems and equipment must operate during cleanup and power outages?
- Downtime and repair: Would a lower first cost create longer closure, mold remediation or replacement work?
- Maintenance: Who will clear inlets, test pumps, inspect seals and exercise generators?
- Professional coordination: Does the proposal require architectural, civil, structural, mechanical or electrical input?
Boney summarizes the economic logic this way: “Designing our buildings to withstand severe weather is far less expensive than repairing avoidable damage.” The article also contrasts a $500 roof leak with a $500,000 mold-and-mildew abatement contract. That comparison is the author’s rhetorical example, not a general cost statistic or a project cost study; actual costs depend on building size, materials, labor, insurance and duration of exposure.
What does the Bogue Banks recovery example add?
Resilience extends beyond individual buildings. A 2019 American Shore and Beach Preservation Association conference abstract reports that roughly 5.2 miles of Bogue Banks lost approximately 945,000 cubic yards of sand after Florence. It describes using the Bogue Banks Beach Master Plan to guide recovery planning and permits. These are coastal-restoration figures, not evidence of building performance, but they show why post-storm work must be coordinated at the shoreline and infrastructure scale as well as at a single parcel.
How should climate projections influence design decisions?
Boney refers to expectations attributed to NOAA climate scientists that future hurricanes could become larger, slower, more powerful and more destructive as the climate warms. The underlying NOAA statement was not independently checked for this article, so treat that passage as the author’s attribution rather than as a separately verified finding. Designers should still use the best current regional climate, flood, rainfall and code information available when setting design criteria, and document which assumptions were used.
Resilience is therefore an iterative process. Revisit flood maps, drainage maintenance, equipment inventories and emergency procedures as the site changes, new hazard data is adopted or the building’s use expands.
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What does “think like a raindrop” mean in practice?
Boney’s phrase “think like a raindrop” is a useful site-walk method: trace water from the roof, across the grade, toward inlets, around walls and past every threshold. Then extend the exercise to the failure case. Ask what happens when debris blocks the inlet, surge prevents discharge, a pump loses power or wind drives rain through a joint. Boney adds that designers must also “think like a Category 5 hurricane”; that is a memorable warning, not a technical standard.
Use the exercise with drawings and on-site observation, then have qualified professionals convert it into elevations, sections, specifications, calculations and maintenance responsibilities. The result should be a building that manages water deliberately rather than one that merely hopes the drainage system performs as intended.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallWhat is the practical takeaway for a new coastal project?
Set resilience goals before schematic design and keep them visible through construction and operations. Confirm the finished-floor strategy with site and flood analysis; provide a documented overflow path; detail window pans and door thresholds as a continuous drainage system; keep essential equipment above credible water levels where feasible; and write recovery and maintenance steps into the owner’s plan. No single anecdote from Florence guarantees performance elsewhere, but the storm’s prolonged rain and inland flooding make the sequence of questions difficult to ignore.
For project-specific decisions, engage an architect and civil engineer familiar with local hazards, plus mechanical, electrical and facilities specialists when continuity is critical. Their coordinated assessment is more reliable than selecting an isolated product or copying a detail from another building.
Frequently Asked Questions
Do raised finished floors eliminate flood risk?
No. Elevation can reduce direct inundation, but runoff may still reach walls, entrances, utilities or neighboring low points. A resilient design pairs elevation with overflow routes, protected openings, accessible egress and a plan for drainage failure.
Can a portable generator safely run a basement dewatering pump?
Only when the pumping system, electrical connection, fuel storage, ventilation and discharge route are professionally designed and permitted. Flooded electrical equipment may be unsafe to energize, and pumping groundwater without considering hydrostatic pressure or outfall conditions can create new damage.
What should an owner ask during a resilience assessment?
Ask the team to show normal and failure-case water paths, identify equipment that would stop essential operations, and explain who will maintain every pump, inlet, threshold and generator connection. Request assumptions and responsibilities in writing so they remain clear after construction.
How often should coastal drainage and envelope details be inspected?
The interval depends on the building, exposure and maintenance program, but inspections should occur before hurricane season and after major storms, with routine checks between events. Clear debris from inlets, verify that grading remains open, inspect door and window seals, and document repairs before the next storm.
