Our Services

Overview

We provide comprehensive support for Letters of Map Change (LOMC), helping property owners and developers obtain official revisions to FEMA Flood Insurance Rate Maps. Our expertise ensures your applications are technically sound, complete, and compliant with FEMA requirements.

Services Include

• LOMA (Letter of Map Amendment): Remove structures from Special Flood Hazard Areas based on elevation data
• LOMR (Letter of Map Revision): Revise flood maps based on new hydrologic/hydraulic studies or physical changes
• LOMR-F (Fill-based revisions): Document fill placement to elevate property above Base Flood Elevation
• Conditional Letters: Obtain pre-construction approval for proposed conditions
• PMR (Physical Map Revision): Update maps to reflect as-built conditions

Our Process

1. Initial site evaluation and determination of appropriate LOMC type
2. Data collection including surveys, existing studies, and as-built documentation
3. Technical analysis and preparation of engineering documentation
4. Application assembly with all required forms and supporting materials
5. Submittal to FEMA and coordination through review process
6. Response to FEMA comments and revisions as needed

Typical Deliverables

Completed FEMA application package, engineering analysis, supporting calculations, annotated FIRMs, technical narratives, and coordination with FEMA throughout the review process.

Overview

Our modeling services provide detailed analysis of flood behavior for riverine and pluvial systems. Using HEC-RAS, HEC-HMS, and other industry-standard tools, we develop accurate flood models that support regulatory compliance, design decisions, and risk assessment.

Modeling Capabilities

• HEC-RAS Analysis: 1D and 2D hydraulic modeling for riverine systems, channel improvements, and bridge/culvert analysis
• HEC-HMS Modeling: Watershed-scale hydrologic analysis and design storm development
• Floodplain Mapping: Development of regulatory floodplain boundaries and flood depth grids
• Dam Break Analysis: Inundation mapping for dam failure scenarios
• Storm Surge Modeling: Coastal flood analysis and wave effects
• Levee Analysis: Certification studies and accreditation support

Applications

Our modeling services support FEMA map revisions, infrastructure design, development permitting, mitigation planning, and regulatory compliance for projects of all scales.

Quality Standards

All models are developed in accordance with FEMA guidelines, including proper terrain representation, appropriate roughness parameters, calibration to known events where data exists, and documentation meeting FEMA quality assurance standards.

Overview

Navigate federal, state, and local floodplain regulations with expert consulting services. We help ensure your projects meet NFIP requirements, local ordinances, and permitting standards while avoiding costly delays and redesigns.

Compliance Services

• NFIP Compliance Review: Verification that projects meet National Flood Insurance Program requirements
• Permit Support: Preparation of floodplain development permits and variance applications
• No-Rise Certification: Analysis and documentation that development doesn't increase flood elevations
• Substantial Improvement Analysis: Determination of regulatory thresholds for building modifications
• Local Ordinance Review: Interpretation of municipal floodplain management regulations
• Regulatory Interpretation: Clarification of FEMA guidance and technical standards

Who We Help

We assist developers navigating permitting requirements, engineers ensuring design compliance, municipalities administering floodplain programs, and property owners understanding regulatory obligations.

Overview

Detailed floodplain studies that characterize flood risk, support development decisions, and provide defensible engineering analysis for regulatory and design purposes.

Analysis Services

• Base Flood Elevation Determination: Calculation of regulatory flood elevations for specific locations
• Floodway Delineation: Definition of regulatory floodway boundaries
• Flood Risk Assessment: Evaluation of site-specific flood hazards and potential impacts
• Freeboard Analysis: Determination of appropriate safety factors above minimum requirements
• Alternative Methods: Zone A analysis and approximate study approaches where detailed models don't exist
• Flood Storage Compensation: Analysis of fill impacts and compensatory storage requirements

Technical Approach

We utilize best available data, appropriate methodologies, and sound engineering judgment to develop analyses that are technically defensible and meet regulatory standards. Our work is documented thoroughly to support permit applications and regulatory review.

BaseFlood Engineering operates as a specialized resource that complements—not competes with—your existing team and local consultants. Whether you need white-label support, technical partnership, overflow capacity, or independent review, we're designed to augment your capabilities when FEMA projects get complex.

Learn How We Work