Special Flood Hazard Area (SFHA)

Know your flood zone:


Review the local Pasco County Land Development Codes & Ordinances:


Common Stormwater Management and Flood Damage Prevention Code Sections

902.2.G.5 Floodplain Encroachment

No net encroachment into the floodplain, up to that encompassed by the 100-year event, which will adversely affect either conveyance, storage, water quality, or adjacent lands will be allowed. Any required compensating storage shall be equivalently provided between the seasonal high water level and the 100-year flood level to allow storage function during all lesser flood events. A detailed flood study performed by a registered engineer that indicates no adverse impact to off-site flood elevations may be approved by the County to lessen or remove the flood plain compensation requirements.

902.2.K.1. Drainage Plan

The finished grade of individual lots shall be shown on the construction plans. Generally, lots shall be graded in accordance with Types A, B, or C Typical Grading Plans as shown in Figures 902.2.A, 902.2.B, and 902.2.C. When topography or other features make such lot grading impractical, alternate standards may be presented for the County Administrator's or designee's review and approval. The proposed minimum, finished floor elevation of all structures which may be constructed shall be included on the construction plans. As a minimum, the finished floor elevation shall be at least sixteen (16) inches above the highest crown line of the street lying between the projection of the side-building lines, unless otherwise approved by the County Administrator or designee. In no case shall finished floor elevations be specified below the 100-year flood plain as designated by the Federal Insurance Administration Flood Hazard Boundary Maps. When a detailed study from the Federal Emergency Management Agency (FEMA) has not been provided, the engineer shall submit the best available data for the 100-year base flood elevation for review and approval by the County Administrator or designee.

The Engineer of Record shall provide to Pasco County, signed and sealed design calculations for each typical lot demonstrating compliance with Pasco County's drainage criteria. The typical site-grading plan shall identify elevations, grades, ground cover, allowable tolerances, and quality-control plans addressing construction and post- construction phases.

902.2.K.3. Drainage Plan Requirements for Individual Lots

For lots one (1) acre or less in size, two (2) copies of a drainage plan shall be submitted with the Building Permit Application for review and approval. The following information shall be included in the plan, which shall be signed and sealed by a Florida registered Professional Engineer.

  1. The plan shall indicate the name of the development (if applicable), scale of plan, north arrow, and legend; parcel identification number or legal description sufficient to describe the size and location of the project site, including the plat book page and number, if platted; and the name, address, and telephone number of the builder, owner, and engineer/ surveyor.
  2. The plan shall show the abutting sections of any roadway(s) and the corresponding elevations along the projection of the building lines onto the centerline of the roadway(s) and the elevations on all corners of the building pad. Lot elevation at a minimum of a 100-foot grid for lots larger than one (1) acre and a fifty (50) foot grid minimum for lots one (1) acre or less. A reference elevation may be assumed.

902.2.K.4. Lot Drainage Enforcement

  1. Prior to constructing a structure on one (1) acre or less, the builder shall be required to provide an engineered lot grading plan with the Building Permit Application that does not cause an adverse impact on adjacent or off-site property.
  2. As part of the Building Permit Application for any accessory structure on one (1) acre or less where impervious area is added or where a lot's contours are proposed to be altered for an area over 500 square feet, an engineered plan addressing the lot grading shall be required. These types of permits are additions, pools, slabs, etc.
  3. Prior to the release of the CO (Certificate of Occupancy), CC (Certificate of Completion), or final inspection where no CO or CC is issued, the developer/owner/builder shall provide the Affidavit of Lot Grading and Finished Floor Elevation Compliance. For buildings and structures in Special Flood Hazard Areas, as defined by FEMA's latest update or revision, documentation of the as-built lowest floor elevation (Elevation Certificate) and an "As Built" survey demonstrating conformance to the approved Stormwater Management Plan shall be provided to the County Administrator or designee. Any deviations from the approved plan must be noted and will be reviewed for compliance with this Code.

1104.6.12.C. Detached accessory structures

Detached accessory structures are permitted below the base flood elevation provided the accessory structures are used only for parking or storage and:

  1. If located in special flood hazard areas (Zone A/AE) other than coastal high hazard areas, are limited to one-story and shall not be larger than 600 sq. ft. and:
    1. Are anchored to resist flotation, collapse or lateral movement resulting from flood loads.
    2. Have flood openings in accordance with Section R322.2 of the Florida Building Code, Residential.
    3. Have flood damage-resistant materials used below the base flood elevation plus one foot.
    4. Have mechanical, plumbing and electrical systems, including plumbing fixtures, elevated to or above the base flood elevation plus one foot.
  2. If located in coastal high hazard areas (Zone V/VE), are not located below elevated buildings and are not larger than 100 sq. ft.
    1. Are anchored to resist flotation, collapse or lateral movement resulting from flood loads.
    2. Have flood damage-resistant materials used below the base flood elevation plus one foot.
    3. Have mechanical, plumbing and electrical systems, including plumbing fixtures, elevated to or above the base flood elevation plus one foot.

1104.6.12.D. Manufactured Homes

  1. General. All manufactured homes installed in flood hazard areas shall be installed by an installer that is licensed pursuant to section 320.8249, F.S., and shall comply with the requirements of Chapter 15C-1, F.A.C. and the requirements of this Code, Section 1104. Manufactured homes shall not be installed in floodways except in a lawfully existing manufactured home park or subdivision.
  2. Foundations. All manufactured homes installed in flood hazard areas shall be installed on permanent, reinforced foundations that:
    1. a. In flood hazard areas (Zone A) other than coastal high hazard areas, are designed in accordance with the foundation requirements of the Florida Building Code, Residential Section R322.2 and this Code, Section 1104.
    2. In coastal high hazard areas (Zone V), are designed in accordance with the foundation requirements of the Florida Building Code, Residential Section R322.3 and this Code, Section 1104.
  3. Anchoring. All manufactured homes shall be installed using methods and practices which minimize flood damage and shall be securely anchored to an adequately anchored foundation system to resist flotation, collapse or lateral movement. Methods of anchoring include, but are not limited to, use of over-the-top or frame ties to ground anchors. This anchoring requirement is in addition to applicable state and local anchoring requirements for wind resistance.
  4. Elevation. All manufactured homes that are placed, replaced, or substantially improved in flood hazard areas shall be elevated such that the bottom of the frame is at or above the elevation required, as applicable to the flood hazard areas, in the Florida Building Code, Residential Section R322.2 (Zone A) and Section R322.3 (Zone V and Coastal A Zone).
  5. Enclosures. Enclosed areas below elevated manufactured homes shall comply with the requirements of the Florida Building Code, Residential Section R322.2 or R322.3 for such enclosed areas, as applicable to the flood hazard area.
  6. Utility equipment. Utility equipment that serves manufactured homes, including electric, heating, ventilation, plumbing, and air conditioning equipment and other service facilities, shall comply with the requirements of the Florida Building Code, Residential Section R322, as applicable to the flood hazard area.