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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structural soils as recommended by property without creating ponding,
the City Arborist) shall be required. flooding or other drainage problems
b. Where the applicant can demonstrate and that the owner of the lot being
that site constraints prevent the improved has the legal right to
planting of required street trees in the increase the flow of stormwater onto
city right-of-way, the review authority the adjacent lot or City property.
may permit an alternative subject to c. Any increase in volume or rate of
the landscaping standards of the stormwater draining from the lot into
Technical Manual. the City’s storm sewer system can be
c. Where the proposed development accommodated in the system without
includes the removal of an existing creating downstream problems or
street tree determined by the City exceeding the capacity of the storm
Arborist to be a heritage or feature sewer system.
mature tree, the applicant shall be 2. All development shall comply with the
required to contribute to the Tree stormwater management standards of the
Fund at the designated rate in the Technical Manual.
Technical Manual so that the total 3. Development shall not pose a risk of
replacement cost is significantly groundwater contamination either during
higher than planting a new street or post-construction, as described in the
tree/contributing for a new street tree. stormwater management and water supply
C. Water quality, stormwater management, standards of the Technical Manual.
and erosion control 4. Applicants shall demonstrate that
1. All development shall be designed to subsurface and/or any adjacent slope
minimize total area of impervious surface conditions are suitable to support the
on the site and both the volume and rate development, and where determined
of runoff from the lot. Provisions for necessary, shall prepare a geotechnical
stormwater management shall study to demonstrate that the
demonstrate the following: development as designed will not adversely
a. Any stormwater draining onto or impact the development site or any
across the lot in its pre-improvement abutting property. Soil surveys and/or
state will not be impeded or re- geotechnical studies shall be prepared in
directed so as to create ponding on, accordance with the requirements of the
or flooding of, adjacent lots. Technical Manual.
b. Any increase in volume or rate of
stormwater draining from the lot onto
an adjacent lot or City property
following the improvement can be
handled on the adjacent lot or City CITY OF PORTLAND LAND USE CODE | 13-11 SITE PLAN

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