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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N. Hydraulic openings/flood vents. New electrical and other non-
construction or substantial improvement of automatic mechanical means.
any structure in Zones A, AE, AO, and AH that 3. The enclosed area shall not be used for
meets the development standards of human habitation.
Subsection 12.4.5, including the elevation 4. The enclosed areas are usable solely for
requirements of Subsection 12.4.5(H), (I), or (J) building access, parking vehicles, or storing
and is elevated on posts, columns, piers, piles, of articles and equipment used for
or crawl spaces may be enclosed below the maintenance of the building.
base flood elevation requirements provided all O. Bridges. New construction or substantial
the following criteria are met or exceeded: improvement of any bridge in Zones A, AE, AO,
1. Enclosed areas are not basements as AH, and VE shall be designed such that:
defined in Article 3. 1. When possible, the lowest horizontal
2. Enclosed areas shall be designed to member (excluding the pilings, or
automatically equalize hydrostatic flood columns) is elevated to at least two feet
forces on exterior walls by allowing for the above the base flood elevation.
entry and exit of flood water. Designs for 2. A registered professional engineer shall
meeting this requirement must either: certify that:
a. Be engineered and certified by a a. The structural design and methods of
registered professional engineer or construction shall meet the elevation
architect, or requirements of this section and the
b. Meet or exceed the following floodway standards of Subsection
minimum criteria: 12.4.5(M).
i. A minimum of two openings b. The foundation and superstructure
having a total net area of not less attached thereto is anchored to resist
than one square inch for every flotation, collapse, and lateral
square foot of the enclosed area; movement due to the effects of wind
ii. The bottom of all openings shall and water loads acting simultaneously
be below the base flood elevation on all structural components. Water
and no higher than two feet loading values used shall be those
above the lowest grade. associated with the base flood.
iii. Openings may be equipped with P. Containment walls. New construction or
screens, louvers, valves, or other substantial improvement of any containment
coverings or devices provided wall shall meet the following requirements by
that they permit the entry and zone:
exit of flood waters automatically 1. Zones A, AE, AO, AH, and VE shall:
without any external influence or a. Have the containment wall elevated
control such as human to at least two feet above the base
intervention, including the use of flood elevation; CITY OF PORTLAND LAND USE CODE | 12-13 FLOODPLAIN MANAGEMENT

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