Liberty County reviews floodplain rules, LIDAR update and sand‑and‑gravel permit process at workshop

Liberty County officials and outside consultants used an April workshop to review the county’s master drainage plan update, the county’s floodplain and floodway permitting process and how sand‑and‑gravel (quarry) projects will be reviewed under Federal Emergency Management Agency rules.

The discussion focused on technical steps needed to produce an “apples‑to‑apples” baseline model local engineers and FEMA can use, the county’s recent LIDAR and benchmark survey work, and the process for Letters of Map Change when proposed work alters regulatory flood elevations.

County Judge (name not recorded) said the master drainage plan and supporting data were the reason for the workshop and underscored the need to use the federal and state processes correctly. The judge warned of the consequences of noncompliance with FEMA rules: "If you're not gonna behave, we'll just cancel your flood insurance for the entire county, period," he said.

William Tomlin, senior project manager with LJA, described the county’s regulatory foundation: "That's the flood damage ordinance. That's the development criteria for projects in the floodplain, floodway based on FEMA codes and regulations." He and other LJA staff explained that the county’s grant‑funded master drainage plan relies on updated terrain data, including 2024 LIDAR that is still in quality assurance and control and expected to be released publicly later in the spring.

Consultants said Liberty County now has more than 300 new survey monuments and benchmarks tied into modern vertical datums; those monuments are intended to help reconcile older FEMA models (some dating to the 1970s–1980s) with newer terrain data. LJA said the county’s process will create a revised existing‑conditions model, then a proposed‑conditions model to test whether a development raises water‑surface elevations. FEMA rules require that increases of 0.01 foot or more in the regulatory floodway must be mitigated or formally reviewed through a Letter of Map Revision (LOMR) or a Conditional Letter of Map Revision (CLOMR).

Anna Chamberlain of LGA said the presentation pulled directly from public authorities: "Everything that I'm saying in here is directly from the Texas Water Development Board's floodplain management quick guide, the FEMA map service center and FEMA regulations, and then the Liberty County Flood Damage Prevention Ordinance." The panel reiterated that the county must document reviews and enforce its ordinance to remain in the National Flood Insurance Program; failure to document required reviews can lead to surcharges, denial of renewals and limits on federal grant eligibility.

Consultants described how the review queue and timing work: county permitting staff forward development submissions to LJA/LGA, which aims for a roughly 30‑day technical review window under state statutes; resubmittals restart the review clock. LJA staff said they typically review submissions in receipt order and return written comments asking for missing documentation or clarifications of engineering assumptions rather than overruling engineers’ technical choices.

Applicants for two sand‑and‑gravel projects discussed at the meeting — repeatedly referred to as the Harrington and Hallet materials submissions — were told LJA returned review comments asking for additional documentation and clearer linkage between older FEMA models and the updated terrain and datum information. LJA said it had sent comments for those submittals and was awaiting revised materials. Melinda (Liberty County floodplain administrator) confirmed the county is still working through a FEMA community assessment visit and that the county has submitted requested materials and awaits a final determination.

Developers raised practical concerns about temporary construction power and the time required to partition parcels so upland structures could be permitted separately from floodplain work. County staff said permits for upland features can be issued if the proposed work is shown to be outside regulated flood areas, but that entire parcels with portions in the floodway will require the floodplain analyses described above before final approval.

On sand‑and‑gravel operations, LJA staff noted these excavations often create substantial temporary storage (pits that can be many feet deep) and that such storage may be credited toward detention requirements but does not substitute for floodway conveyance. The consultants said detailed hydraulic modeling is the method authorized to demonstrate no net rise in water‑surface elevations; if a modeled proposed condition shows any regulated increase in the floodway, FEMA processes (CLOMR/LOMR) are required and the county must sign the community acknowledgement portion of those forms before FEMA considers them.

No formal motions or votes were recorded in the workshop. Commissioners requested continued coordination among county permitting staff, LJA/LGA and applicants so documented revisions can be returned and, once complete, placed on a future commissioners court agenda for formal action if needed.

The county and consultants said the master drainage plan and updated models and maps will be shared publicly after QA/QC is complete so engineers, developers and residents can use the updated data for project planning. LJA estimated the complete FEMA‑quality mapping and model availability could take multiple years and emphasized that updates are incremental: the master plan will help streamline future reviews but cannot immediately replace all legacy FEMA data.

The session closed with applicants told to revise responses and provide the additional documentation LJA requested; staff said they would return a letter of no objection when the submittals meet county criteria so projects may be placed on a commissioners court agenda for formal permit actions.