Round Rock, TX Environmental Rules: Flood Elevation Requirements (2026)
Key Facts
- Freeboard
- One foot above 100-year flood
- Code section
- § 14-119(c)
- Applies to
- Lots in/near 100-year floodplain
- Fixed by
- Final subdivision plat
- Enforced by
- Planning & Development Services
Summary
Round Rock requires any structure built on a lot within or adjacent to the 100-year floodplain to have its finished floor slab set at least one foot above the 100-year flood level, fixed on the final subdivision plat.
(a) Preliminary plans for subdivisions shall show the limits of the 25- and 100-year floodplain for all waterways drainage 50 or more acres. ... (c) The final plat shall establish specific minimum floor slab elevations for construction of any structures on a lot adjacent to or within and adjacent to any 100-year floodplain area to assure future structures are constructed a minimum of one foot above the 100-year storm levels.
Full Breakdown
The rule sits in Chapter 14 (Environment), Article V, Stormwater Drainage. Section 14-119(c) directs that the final plat establish specific minimum floor slab elevations for structures on any lot within or adjacent to a 100-year floodplain, guaranteeing at least one foot above the 100-year storm levels. Preliminary plans must map the 25- and 100-year floodplain for waterways draining 50 or more acres, and an engineer must certify that slab elevations and drainage notes meet city criteria. Round Rock Planning and Development Services administers plat and building-permit review; the design engineer must certify compliance before a certificate of occupancy issues.
Violations & Fines
A final plat lacking certified minimum slab elevations will not be approved, and the city withholds building permits and the certificate of occupancy until the design engineer certifies drainage and elevation compliance.
Frequently Asked Questions
How high must a floor be above the floodplain in Round Rock?
Does Round Rock have a separate FEMA flood damage prevention ordinance?
Which structures does the rule cover?
Sources & Official References
Other rules in Round Rock
Texas rules heatmap·Compare Round Rock to another location·View the Texas environmental rules overview
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Flood Elevation Requirements in Nearby Cities
How other cities in Williamson County handle flood elevation requirements.