[Amended 12-15-1987 STM by Art. 15; 4-25-1988 ATM by Art. 26; 10-21-2019 STM by Art. 17; 5-10-2021 ATM by Art. 42]
A.
The purpose of the Floodplain Overlay District is to:
(1)
Ensure public safety by reducing the threats to life and personal injury.
(2)
Eliminate new hazards to emergency response officials.
(3)
Prevent the occurrence of public emergencies resulting from water quality, contamination, and pollution due to flooding.
(4)
Avoid the loss of utility services that if damaged by flooding would disrupt or shut down the utility network and impact regions of the community beyond the site of flooding.
(5)
Eliminate costs associated with the response and cleanup of flooding conditions.
(6)
Reduce damage to public and private property resulting from flooding waters.
B.
The Floodplain District is herein established as an overlay district. The District includes all special flood hazard areas within the Town of Marion designated as Zone A, AE, AH, AO, A99, V, or VE on the Plymouth County Flood Insurance Rate Map (FIRM) dated July 6, 2021, issued by the Federal Emergency Management Agency (FEMA) for the administration of the National Flood Insurance Program. The exact boundaries of the District shall be defined by the one-percent-chance base flood elevations shown on the FIRM and further defined by the Plymouth County Flood Insurance Study (FIS) report dated July 6, 2021. The FIRM and FIS report are incorporated herein by reference and are on file with the Town Clerk, Planning Board, Building Department, and Conservation Commission.
C.
The Building Commissioner is designated as the official floodplain administrator for the Town of Marion.
D.
If the Town of Marion acquires data that changes the base flood elevation in the FEMA mapped special flood hazard areas, the Town will, within six months, notify FEMA of these changes by submitting the technical or scientific data that supports the change(s.) Notification shall be submitted to: FEMA Region I Risk Analysis Branch Chief, 99 High St., 6th floor, Boston, MA 02110; and copy of notification to: Massachusetts NFIP State Coordinator, MA Department of Conservation and Recreation, 251 Causeway Street, Boston, MA 02114.
E.
Marion requires a permit for all proposed construction or other development in the floodplain overlay district, including new construction or changes to existing buildings, placement of manufactured homes, placement of agricultural facilities, fences, sheds, storage facilities or drilling, mining, paving and any other development that might increase flooding or adversely impact flood risks to other properties. Specific Marion requirements:
(1)
There shall be no new residential construction of any sort on lots completely within the Marion Velocity Zone. The only exceptions are:
(a)
Seawalls, piers, groins, wharves, weirs and similar structures are not prohibited by this section; and
(b)
Lots created before the enactment of this bylaw whose areas lie completely within the Velocity Zone may be built upon, providing the structure(s) is located as far landward of mean high water as possible.
(2)
In the case of lots created before the date of enactment of this bylaw and with areas both in the Velocity Zone and outside the Velocity Zone, all structures built after the enactment of this bylaw shall be located in the area outside the Velocity Zone. If this area is not sufficient to allow for the required zoning setbacks, the applicant may apply for a variance to allow lesser setbacks. The only exceptions are seawalls, piers, groins, wharves, weirs and similar structures.
(3)
Every buildable lot created after the enactment of this bylaw shall have an adequate building area, plus the required setbacks outside the Velocity Zone, and all structures shall be placed within this area. The only exceptions are: seawalls, piers, groins, wharves, weirs and similar structures.
(4)
The landward line of the Velocity Zone must be located on the official lot plan by a licensed surveyor and registered with the plan at the Massachusetts Registry of Deeds.
(5)
Any use otherwise permitted or authorized by special permit in the district underlying the Flood Hazard District shall likewise be permitted or authorized by special permit in the Flood Hazard District subject to the special provisions of this section.
F.
Marion's permit review process includes the use of a checklist of all local, state and federal permits that will be necessary in order to carry out the proposed development in the floodplain overlay district. The proponent must acquire all necessary permits, and must submit the completed checklist demonstrating that all necessary permits have been acquired.
G.
Any use otherwise permitted or authorized by special permit in the district underlying the Flood Hazard District shall likewise be permitted or authorized by special permit in the Flood Hazard District subject to the special provisions of this section.
H.
For variance to building code floodplain standards, Marion will request from the State Building Code Appeals Board a written and/or audible copy of the portion of the hearing related to the variance, and will maintain this record in the community's files. Marion shall also issue a letter to the property owner regarding potential impacts to the annual premiums for the flood insurance policy covering that property, in writing over the signature of a community official that 1) the issuance of a variance to construct a structure below the base flood level will result in increased premium rates for flood insurance up to amounts as high as $25 for $100 of insurance coverage and 2) such construction below the base flood level increases risks to life and property. Such notification shall be maintained with the record of all variance actions for the referenced development in the Floodplain Overlay District.
I.
A variance from local floodplain bylaws must meet the requirements set out by state law, and may only be granted if:
K.
When proposing subdivisions or other developments greater than 50 lots or five acres (whichever is less), the proponent must provide technical data to determine base flood elevations for each developable parcel shown on the design plans.
L.
In A Zones, in the absence of FEMA BFE data and floodway data, the Building Department will obtain, review and reasonably utilize base flood elevation and floodway data available from a federal, state, or other source as criteria for requiring new construction, substantial improvements, or other development in Zone A as the basis for elevating residential structures to or above base flood level, for flood proofing or elevating nonresidential structures to or above base flood level, and for prohibiting encroachments in floodways.
M.
Within Zones AO and AH on the FIRM, adequate drainage paths must be provided around structures on slopes, to guide floodwaters around and away from proposed structures.
N.
In Zones A, A1-30, and AE, along watercourses that have not had a regulatory floodway designated, the best available federal, state, local, or other floodway data shall be used to prohibit encroachments in floodways which would result in any increase in flood levels within the community during the occurrence of the base flood discharge. In Zones A1-30 and AE, along watercourses that have a regulatory floodway designated on the Plymouth County Flood Insurance Rate Map (FIRM) dated July 6, 2021, encroachments are prohibited in the regulatory floodway that would result in any increase in flood levels within the community during the occurrence of the base flood discharge.
O.
In a riverine situation, the Building Commissioner shall notify the following of any alteration or relocation of a watercourse:
(1)
Adjacent communities, especially upstream and downstream.
(2)
Bordering states, if affected.
(3)
NFIP State Coordinator, Massachusetts Department of Conservation and Recreation, 251 Causeway Street, 8th floor, Boston, MA 02114.
(4)
NFIP Program Specialist, Federal Emergency Management Agency, Region I, 99 High Street, 6th Floor, Boston, MA 02110.
P.
In A1-30, AH, AE Zones, VI-30, VE, and V Zones, all recreational vehicles to be placed on a site must be elevated and anchored in accordance with the zone's regulations for foundation and elevation requirements or be on the site for less than 180 consecutive days or be fully licensed and highway ready.
Q.
Alteration of sand dunes is prohibited when the alteration would increase potential flood damage.
R.
The floodplain management regulations found in this Floodplain Overlay District section shall take precedence over any less restrictive conflicting local laws, ordinances or codes.
S.
The degree of flood protection required by this bylaw is considered reasonable but does not imply total flood protection.
T.
If any section, provision or portion of this bylaw is deemed to be unconstitutional or invalid by a court, the remainder of the bylaw shall be effective.