Federal Overlays Atlas
Five federal regulatory overlays that preempt city zoning.
Overview
Five federal regulatory overlays that preempt city zoning. Every city profile in the corpus runs through these predicates — click through for the plain-English explainer and the structured trigger rule.
Overlays tracked
5
Authority
Federal
Tracked overlays
FAA Part 77
FAA Part 77 — Imaginary Surfaces / Obstruction Clearance
Federal airspace-protection rules that cap how tall you can build near airports.
Federal Aviation Administration (FAA) · enacted 1965
DoD AICUZ
DoD Air Installation Compatible Use Zones (AICUZ)
Department of Defense land-use compatibility zones around military airfields.
U.S. Department of Defense (DoD) · enacted 1977 (DoD Directive 4165.57)
FEMA NFIP / SFHA
FEMA National Flood Insurance Program — Special Flood Hazard Area
FEMA's Special Flood Hazard Area rules — Zone A/AE/AO/AH/V — govern elevation and floodproofing in the 100-year flood zone.
Federal Emergency Management Agency (FEMA) · enacted 1968 (National Flood Insurance Act)
Military Airport Preservation
Military Airport Preservation — Luke AFB & Davis-Monthan AFB (Arizona)
Arizona-specific state preservation framework for Luke AFB and Davis-Monthan AFB approach corridors.
Arizona Department of Real Estate + DoD · enacted 2001 (ARS §28-8481)
ESA Critical Habitat
Endangered Species Act — Section 9 Take Prohibition & Section 7 Federal Nexus Consultation
Endangered Species Act Section 7 / Section 9 protections on designated critical habitat.
U.S. Fish & Wildlife Service / NOAA · enacted 1973 (Endangered Species Act)
How these pages are structured
Each overlay page carries the handwritten "why it matters" framing up top, then the machine-readable parts from federal-overlays/*.json: the trigger predicate (when the overlay fires), the list of base-zoning fields it preempts, the citation, and the research notes. The trigger predicates drive the city-level overlay evaluator in _skill-v2/_lib/overlay_evaluator.py.