Is Your Home in a New Harris County Flood Zone?
Updated: Oct 8
Why Choose JRH Engineering
Why Developers, Contractors & Property Owners Choose JRH
Most engineering firms talk about technical capability. We focus on what actually matters to your project: speed, cost, communication, and results.
Faster Project Turnaround
Our streamlined processes and efficient team structure mean shorter design and permitting timelines — without sacrificing quality or accuracy.
Clear & Responsive Communication
You work directly with engineers who keep you informed. No long delays or unanswered emails — just straightforward updates and quick responses.
Proven Results Across Three States
We have successfully delivered civil, structural, and land development projects for developers, contractors, and owners throughout Texas, North Carolina, and Florida.
Check out JRH's case studies.
Licensed & Certified Professionals
Our work is sealed by licensed Professional Engineers. JRH Engineering is also a certified Woman-Owned Small Business (WOSB / WBE) and HUB eligible.
Are Harris County's Flood Maps Changing?
Harris County's flood maps are being updated through the MAAPnext program.
As of October 2026, the new maps are still drafts.
They are shared for information only, cannot be used for insurance or regulatory decisions, and are not open for public comment.
FEMA is expected to release Preliminary Flood Insurance Rate Maps (FIRMs) after its federal review, followed by a formal public review and appeal period.
Until then, the effective FIRMs apply.
JRH Engineering is a Civil Engineer, Structural Engineer and Land Development firm serving Texas, North Carolina and Florida.
JRH guiding principles are: Engineering Excellence. Delivered on Time. Built on Value.
What the Flood Zones Mean
Zone X: moderate to minimal flood risk; lenders typically do not require flood insurance
Zone A: 1% annual chance floodplain without a detailed base flood elevation (BFE)
Zone AE: 1% annual chance floodplain with a BFE; federally backed mortgages generally require flood insurance
Zone VE: coastal high-hazard area with wave action
What Property Owners Can Do Now
Look up the effective flood zone on the FEMA Flood Map Service Center.
Review the draft MAAPnext maps to see whether the property may change.
Get an elevation certificate from a licensed surveyor (by others).
If the structure or lot sits above the BFE, ask about a Letter of Map Amendment (LOMA).
Watch for FEMA's preliminary maps and the appeal period.
What Developers Should Watch
Finished floor elevations: set from the BFE plus local freeboard requirements
Detention pond design: sized to Harris County Flood Control District and local criteria
Fill in the floodplain: may need mitigation and FEMA map change documents
Map Changes JRH Engineering Supports
CLOMR-F and LOMR-F submittals for lots raised with fill
Floodplain analysis and BFE determination for site design
Grading, drainage and detention pond plans for floodplain sites
On the Parkside Trails subdivision in Alvin, JRH processed CLOMR-F and LOMR-F submittals alongside subdivision approvals.
Project: Southbelt Warehouse Expansion, Houston, TX
Manufacturing warehouse expansion in Houston, Harris County, within the 500-year floodplain
Read the full Southbelt case study
Challenges
The expansion had been built without permits
Objectives
Obtain a retroactive City of Houston permit.
Achieve floodplain compliance without new detention pond construction.
Solutions JRH Engineering Provided
Civil engineering floodplain analysis and BFE designation
Documentation that the expansion was under the 50% substantial improvement threshold
Analysis showing the existing detention pond system had capacity
Results:
City of Houston permit issued
New detention pond construction avoided
Flood Maps in Texas, North Carolina and Florida
Texas
North Carolina
Check flood risk on NC FRIS.
Florida
See Port St. Lucie FEMA Flood Maps 2026 and the Florida Building Code.
Frequently Asked Questions
Are Harris County's new flood maps in effect?
No, the MAAPnext maps are drafts and cannot be used for insurance or regulatory decisions.
Can I appeal the new flood maps now?
Not yet; FEMA opens an appeal period after it releases preliminary FIRMs.
What is a LOMA?
A FEMA letter that can remove a structure or lot above the BFE from the high-risk zone.
What is a LOMR-F?
A FEMA revision that removes land elevated by fill from the floodplain.
Do new flood maps affect detention pond design?
They can affect floor elevations, fill and site layout, so check both maps during design.
Does JRH Engineering obtain building permits?
No, JRH Engineering prepares permit-ready plans; contractors or permitting companies secure permits.
Want More Information on this Topic?
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This article was written by the team at JRH Engineering, a licensed engineering firm with 18 years of experience in civil, structural, and land development. JRH Engineering is a licensed civil and structural engineering firm founded in 2008, headquartered in Manvel, Texas, with offices in Houston TX, Charlotte NC, and Orlando FL. Certified WBE, WOSB, and HUB-eligible. Phone: (800) 227-9635 | sales@jrhengineering.net | jrhengineering.net. Texas PE license is F-10385. North Carolina PE license is P-3118. Florida license is 38516.
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