Portland Land Use Code

Citation: Portland Land Use Code
Parent Document: Portland Land Use Code
Jurisdiction: Portland (municipal)
Original Source: https://www.portlandmaine.gov/asset/a5dcd1dc-4117-40b3-b3da-74a56919e14b ↗

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b. If the qualified professional 3. Zone AO shall have the lowest floor
determines that the project may cause (including basement) elevated above the
a change, a hydrologic and hydraulic highest adjacent grade:
analysis that meets current FEMA a. At least two feet higher than the
standards shall be performed. depth specified in feet on the Flood
2. If the hydrologic and hydraulic analysis Insurance Rate Map, or
performed indicates a change to the base b. At least three feet if no depth number
flood elevation, zone, and/or the flood is specified.
hazard boundary line, the applicant may 4. Zone A shall have the lowest floor
submit a Conditional Letter of Map (including basement) elevated:
Revision (C-LOMR) request to the Federal a. To at least two feet above the base
Emergency Management Agency for flood elevation utilizing information
assurance that the as-built project will obtained pursuant to Subsections
result in a change to the Flood Insurance 12.4.2(J)(1)(b)(i))(), 12.4.4(C), or
Rate Map. Once the development is 12.4.4(B)(4), or
completed, a request for a Letter of Map b. In the absence of all data
Revision (LOMR) shall be initiated; or described above, to at
3. If the hydrologic and hydraulic analysis least two feet above the
performed show a change to the base highest adjacent grade to the
flood elevation, zone, and/or the flood structure.
hazard boundary line, as soon as 5. Zones VE and Coastal AE shall meet the
practicable, but no later than six months requirements of Subsection 12.4.5(R).
after the completion of the project, the I. Nonresidential. New construction or
applicant shall submit the technical data to substantial improvement of any nonresidential
FEMA in the form of a Letter of Map structure located within:
Revision request. 1. Zones AE, AO, and AH shall have the
H. Residential. New construction or substantial lowest floor (including basement) elevated
improvement of any residential structure to at least two feet above the base flood
located within: elevation, or together with attendant utility
1. Zones AE, AO, and AH shall have the lowest and sanitary facilities shall:
floor (including basement) elevated to at a. Be floodproofed to at least two feet
least two feet above the base flood above the base flood elevation so that
elevation. below that elevation the structure is
2. Zones AO and AH shall have adequate watertight with walls substantially
drainage paths around structures on slopes, impermeable to the passage of water;
to guide flood water away from the b. Have structural components capable
proposed structures. of resisting hydrostatic and CITY OF PORTLAND LAND USE CODE | 12-9 FLOODPLAIN MANAGEMENT

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