How to apply for a floodplain development permit

Building, grading, filling, excavating, or placing a structure in a mapped flood hazard area may require local approval before work begins. A floodplain development permit helps the City of Susanville review whether a proposed activity meets applicable flood damage prevention standards and protects people, buildings, utilities, and neighboring properties.

The process usually involves identifying the property’s flood zone, preparing clear project information, and submitting materials to the city department responsible for floodplain administration. Requirements can vary by location and project type, so applicants should verify current forms, fees, review times, and technical standards with Susanville Public Works before starting construction.

Early coordination can prevent redesigns and delays. A project may also need building, grading, drainage, encroachment, zoning, environmental, or other approvals in addition to the floodplain development permit.

Determine whether your property is in a regulated area

Begin by checking the property’s location against current FEMA flood insurance rate maps and any local flood hazard information. Important map designations may include high-risk Special Flood Hazard Areas, regulatory floodways, and areas with less detailed flood studies. The parcel’s map designation can affect the level of engineering documentation required.

A mapped zone is only a starting point. The city may need to confirm the base flood elevation, floodway limits, available elevation data, and whether the proposed work changes drainage or obstructs flood flows. Ask Public Works or the city’s designated floodplain administrator for help interpreting the applicable information before preparing plans.

Confirm the work that needs approval

Floodplain review may apply to new buildings, additions, garages, manufactured homes, substantial repairs, demolition and replacement, retaining walls, grading, excavation, fill, storage areas, fences, utility work, and changes to existing structures. Even a small project can require review if it alters ground elevation or reduces the area available for floodwater.

A development permit is separate from general construction authorization. The city may also require building plans, a grading permit, an encroachment permit, or drainage calculations. If your proposal includes a temporary gathering or street use, follow the separate process described in the city’s block party permit guidance, rather than assuming a floodplain approval covers that activity.

Prepare the application materials

Provide a site plan that identifies property lines, existing and proposed structures, access points, drainage features, watercourses, utilities, and the portion of the parcel affected by the project. Include dimensions, finished floor elevations, grade changes, construction limits, and the location of any fill or excavation. Clear labels and a north arrow make technical review easier.

Depending on the project, the city may request an elevation certificate, floodproofing documentation, a no-rise analysis, engineering calculations, a survey, geotechnical information, or a study prepared by a licensed professional. Plans should explain how the work will remain stable during flooding and how construction will avoid creating hazards for adjoining parcels.

Project information	Why it matters
Parcel address and assessor information	Identifies the correct site and ownership
FEMA flood zone and map panel	Establishes the regulatory flood setting
Existing and proposed elevations	Shows whether the building or grade meets required standards
Site and drainage plan	Helps evaluate flood flows, runoff, and access
Construction description	Determines which technical reviews may apply
Supporting engineering documents	Demonstrates compliance for complex or higher-risk work

Submit the request for city review

Complete the current municipal application and include all requested drawings, calculations, ownership information, and signatures. Contact the department before filing if the project involves a floodway, substantial improvement, manufactured housing, critical facilities, or significant grading. Early staff review can identify missing information while changes are still manageable.

Submit the application through the method specified by the city, such as an online portal, email, or in-person delivery. Keep a copy of everything submitted and record the application date. If another permit is filed at the same time, reference the related application numbers so reviewers can coordinate their decisions.

Respond to technical comments

City reviewers may ask for corrections, additional calculations, revised elevations, clarification of construction methods, or evidence that the project will not increase flood levels. Respond to each comment directly and submit a complete revised plan set rather than isolated replacement pages when possible.

Work cannot begin simply because an application has been submitted. Wait for written approval and any related permits required by the city. If the design changes after approval, contact Public Works before proceeding; moving a structure, adding fill, changing finished elevations, or modifying drainage can require amended review.

Meet construction and closeout requirements

Keep the approved permit, plans, and required conditions available at the job site. Follow erosion control, material storage, access, inspection, and flood safety requirements during construction. Do not place debris, soil, equipment, or construction materials where they could block a drainage channel or redirect floodwater.

Some projects require inspections, as-built information, an updated elevation certificate, or other closeout documents. Ask what must be submitted before the permit can be finalized. Retaining these records can also help with future property improvements, insurance questions, resale disclosures, and maintenance of flood protection features.

Practical steps for a smoother review

• Verify the flood zone, base flood elevation, and applicable map information before designing the project.
• Contact the city floodplain administrator early, especially for work near a watercourse or in a regulatory floodway.
• Use a licensed surveyor or engineer when elevations, drainage, structural stability, or floodway impacts require professional certification.
• Submit complete plans that show existing conditions, proposed work, access, utilities, grading, and flood protection measures.
• Wait for written approval and required inspections before placing fill, beginning construction, or occupying a new or altered structure.

For current contacts, forms, utility information, project notices, and municipal service updates, visit the City Public Works website. Start the permit process by confirming the property’s flood hazard information and speaking with the appropriate city reviewer before preparing final plans.