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Here is a clean, scannable summary of the cost-effective Public Assistance (PA) hazard mitigation measures outlined in Appendix J: Cost-Effective Public Assistance Hazard Mitigation Measures.

FEMA considers these measures pre-determined to be cost-effective if their individual cost does not exceed 100% of the eligible repair cost (prior to insurance reductions) and they meet all basic eligibility and Environmental and Historic Preservation (EHP) requirements.

1. Drainage Structures & Culverts

For structural expansions or additions, PA and EHP staff coordinate to evaluate if a Hydrologic and Hydraulic (H&H) study is mandatory to prevent adverse upstream or downstream impacts.

  • Upsizing: Replacing a damaged structure with a larger structure or multiple drainage structures.
  • Erosion & Scour Control: Adding headwalls, wingwalls, flared aprons, or energy dissipation structures. Heavy bank protection can include gabion baskets, rip-rap, cast-in-place concrete, crushed stone, sheet-piling, or geotextile fabric.
  • Green Infrastructure: Integrating nature-based techniques such as bioswales, bioretention, rain gardens, live fascines, vegetated geogrids, brush mattresses, or root wads.
  • Culvert Realignment & Extensions: Realigning culverts vertically or horizontally to match water flow, extending discharges past the embankment toe, or adding relief culverts above the primary flow line.
  • Debris Protection: Installing debris barriers, floating debris risers, or orientation fins.

2. Transportation Facilities

  • Bridges: Replacing low-traffic bridges with low-water crossings. Installing restraint cables or deck/girder uplift tie-downs to prevent displacement during floods or earthquakes. Implementing longitudinal peaked stone toe protection, log vanes, engineered logjams, or log bendway weirs.
  • Marine Ramps: Installing open or floating decking equipped with uplift-resistant tie-downs and fasteners.
  • Roadways & Railways: Stabilizing embankments susceptible to overflow using geotextile drainage blankets, turf reinforcement mats, rolled erosion control products (RECP), and revetments.

3. Mechanical, Electrical, Plumbing (MEP) & Power Systems

  • MEP Components: Adding seismic bracing for conduit, electrical lines, piping, ductwork, and water heaters. Securing roof-mounted equipment via a continuous load path.
  • Floodproofing Systems: Elevating or dry floodproofing vulnerable electrical panels, generators, fuel tanks, and HVAC machinery rooms. Replacing wiring with submersible-rated equivalents when elevation is impractical.
  • Backup Power Readiness: Installing camlocks, transfer switches, circuit isolation, or quick-connect hardware to easily connect portable emergency backup generators.
  • Electric Power Grids: Implementing looped distribution services or redundancies for critical facilities (hospitals, fire stations) without expanding overall grid capacity. Installing lightning arrestors and surge suppressors.
  • Transformers & Utility Poles: Elevating pad transformers above the base flood elevation or supporting pole transformers with multiple poles. Replacing damaged poles with higher-rated options (preferably two classes stronger) supplemented with guys and anchors. Adding cross-bracing to H-frame utility poles.

4. Pipes, Storage Tanks, & Water Systems

  • Piping Infrastructure: Installing pipe joint restraints, utilizing flexible conduit connections, or upgrading to more ductile pipe materials. Applying continuous internal lining or external encasement to prevent structural collapse. Installing underground shut-off valves to isolate damaged segments.
  • Pumps & Intakes: Upgrading stormwater-damaged pumps and motors to submersible or inline models. Adding structural buttressing to raw water intakes to withstand flood debris.
  • Wells & Sewers: Sealing exposed well casings or raising wellheads. Elevating sewer access covers to the hydraulic grade line or installing watertight, cast-iron frames and covers.
  • Storage Tanks: Anchoring or stiffening base connections, and installing self-initiating disconnects and shut-off valves.

5. Buildings and Structures

  • Wind & Seismic Anchoring: Fastening small support buildings to their foundations to prevent rollover or wind-missile hazards. Bracing interior non-structural elements (walls, partitions, parapets, suspended lighting, drop ceilings, and cladding) to prevent collapse. Providing seismic straps or clips for furniture, computers, and bookcases.
  • Floodproofing & Site Work: Underpinning spread footings undercut by scour. Elevating, wet floodproofing, or dry floodproofing structures (including installing physical flood barriers or surrounding rain gardens/bioswales). Replacing impervious paved surfaces with permeable alternatives (porous asphalt, permeable concrete, interlocking pavers) backed by aggregate and geotextile fabric layers.
  • Siding & Openings: Upgrading to stronger, wind-resistant siding with robust attachments. Installing water-resistant vents and adding weather stripping to check water infiltration. Upgrading to wind-resistant doors and frames. Replacing glass with impact-resistant materials.
  • Window Shutters: Prioritized on critical facilities (hospitals), lower floors of noncritical buildings, water-sensitive high-value document centers (libraries), or areas highly vulnerable to roof-debris impacts.
  • Wildfire Risk Mitigation: For facilities located outside of the standard wildland-urban interface, creating defensible space by thinning vegetation or replacing it with high-moisture, low-sap, drought-tolerant native species. Upgrading building elements to non-combustible construction materials.
  • Roofing Upgrades:
  • Installing corrosion-resistant hurricane clips, straps, and fasteners.
  • Strengthening high-wind pressure areas (overhangs, corner zones, roof soffits) and roof openings (hatches, skylights).
  • Replacing low-slope roofs with fully adhered membranes (e.g., modified bitumen).
  • Replacing gable-end framing with hipped roof framing to reduce wind forces.
  • Upgrading gutters and downspouts to redirect water away from foundations.

Mitigation Funding Exclusions: FEMA explicitly prohibits PA mitigation funding for loose-laid roof insulation/membranes due to water intrusion risks, as well as loose-laid ballast stones which can become dangerous wind-borne projectiles.

  • Safe Rooms: Constructing or installing a pre-fabricated tornado or hurricane safe room designed to meet FEMA P-361 standards, provided it is built within the existing footprint of a facility undergoing disaster-related repairs.

6. Signage

  • System Strengthening: Replacing damaged sign panels and structural supports with stronger types of systems, including multiple support posts, heavier panels, and corrosion-resistant fasteners.

Would you like me to clarify the specific H&H study triggers for drainage projects, or help you map any of these architectural mitigation options into a draft scope of work for your active platform?

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