Flood Zones: Kapolei vs Urban Honolulu
How do flood zones rules compare between Kapolei, HI and Urban Honolulu, HI?
Kapolei and Urban Honolulu have similar restriction levels.
Kapolei, HI
Honolulu County
Kapolei parcels within FEMA special flood hazard areas are regulated by ROH Chapter 21A, which sets elevation, flood-proofing, and variance standards for floodplain development.
View full Kapolei rules →Urban Honolulu, HI
Honolulu County
Urban Honolulu's Mapunapuna, Waikiki fringe, and Kakaako makai properties lie in FEMA special flood hazard areas adopted under ROH Sec. 21A-1.5, with elevation and floodproofing required under Sec. 21A-1.8.
View full Urban Honolulu rules →Key Facts Comparison
| Fact | Kapolei | Urban Honolulu |
|---|---|---|
| - | - | |
| Authority | - | ROH Chapter 21A |
| Map source | - | FEMA FIRM |
| Elevation rule | - | Sec. 21A-1.8 |
| Variance | - | Sec. 21A-1.12 |
| Urban hot spots | - | Mapunapuna, Waikiki, Kakaako |
Highlighted rows indicate differences between cities.
Kapolei FAQ
Is my Kapolei property in a flood zone?
Check the FEMA FIRM adopted by Sec. 21A-1.5 or request a determination from the Department of Planning and Permitting before starting any project.
Can I build a finished basement in a Kapolei flood zone?
Below-base-flood-elevation occupied space is generally restricted under Chapter 21A's elevation standards for new construction and substantial improvements.
Urban Honolulu FAQ
Is Mapunapuna really in a flood zone?
Yes. FEMA FIRMs adopted under Sec. 21A-1.5 place much of Mapunapuna in a special flood hazard area, with chronic tidal flooding driving elevation and floodproofing requirements.
Can a Waikiki tower project get a flood variance?
Only under Sec. 21A-1.12 hardship standards, which are narrowly applied. Urban Honolulu variances are rare, and denials preserve NFIP insurance rating for surrounding structures.
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