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Lance Holdorf
@lawrenceholdorf
Professional Civil Engineer and Floodplain Modeling Expert
United States
English
About me
Welcome! I am a licensed PE and Certified Floodplain Manager (CFM) with 15+ years of experience in civil engineering, water resources, and hydrology. I provide expert engineering support for site developers, civil firms, and communities.
Whether you need a complex flood study, drainage analysis, or civil site design services, I deliver precise solutions.
Core services:
1D/2D HEC-RAS Hydraulic Modeling
Floodplain Management & FEMA Mapping
Hydrologic Analysis & Stormwater Design
Technical Reports for Submittals
Civil Site Design Services
Reach out today to discuss your project scope!
Skills
Lance Holdorf
Offline •
See my services
Environmental Compliance
I will provide certified fema flood studies and no rise analysis and site civil design
Portfolio
Work experience
Self Employed
Self-employed • 4 yrs 4 mos
Principal Engineer & Owner | HydroWise Engineering, LLC
Apr 2026 - Present • 3 mos
FEMA & Floodplain Compliance: Executed 1D and 2D HEC-RAS modeling to support Letters of Map Revision (LOMR, CLOMR, LOMA) and "No-Rise" certifications across complex regulatory jurisdictions. Site Civil Design & Permitting: Delivered full-cycle site civil packages—including site grading, stormwater detention design, storm sewer conveyance, and EPSC/SWPPP plans—maximizing buildable land while ensuring municipal compliance
Project Manager III – Water Resources | CEC
May 2024 - Mar 2026 • 1 yr 10 mos
Managed multi-disciplinary engineering teams executing large-scale surface water infrastructure, dam safety, and watershed management projects. Directed project lifecycles from scoping and budgeting through regulatory approval and construction administration. Key Achievements & Landmark Projects: Regional Watershed Modeling: Served as Project Manager for watershed modeling initiative to evaluate existing flooding conditions and potential mitigation solutions. Stream Hydraulics & Infrastructure Protection: Led 1D and 2D hydraulic analyses for pipeline stream exposure repair, evaluating velocity, shear stress, and inundation impacts to satisfy NFIP regulations. Dam Breach & Safety Analysis: Managed comprehensive engineering analyses and inundation mapping for TN State Parks dams in strict adherence to Tennessee Safe Dams guidelines.
City Engineer | Spring Hill Tennessee
Feb 2022 - May 2024 • 2 yrs 3 mos
Served as the technical authority for municipal engineering discipline reviews and local development applications. Directed internal development inspectors and coordinated directly with state and federal agencies. Key Achievements & Landmark Projects: Regulatory Ordinance Modernization: Coordinated and spearheaded the adoption of Ordinance 22-22, updating the City's NFIP regulations to enforce higher standard floodplain management policies. Development Application Review: Managed technical code compliance reviews for all commercial, industrial, and residential site plans, grading plans, and third-party flood studies across the municipality.
