Within Zone A at any location where the 100 year base flood elevation is not
specifically delineated on the FIRM and no base flood elevations and floodway
data is available from Federal, State, or other official sources, the base flood
elevation shall be developed by a Registered Professional Engineer, assuming 7
inches of rain falling on the watershed area over a 24-hour period. 5. Base flood elevation data shall be required for all new subdivisions and other
proposed development (including for manufactured home parks and
subdivisions), as per Section 60.3 (b) (3) of the National Flood Insurance
Program regulations. Should all areas of the site be above the base flood
elevations, it should be so noted on the plans. 6. In a riverine situation, the Building Commissioner shall notify adjacent
communities , the National Flood Insurance Program State Coordinator at the
Massachusetts Department of Conservation and Recreation and the National
Flood Insurance Program Specialist at the Federal Emergency Management
Agency, Region I prior to any alteration or relocation of a watercourse and
submit copies of such notifications to the Coordinating Agency Administrator,
as per Section 60.3 (b) (6) of the National Flood Insurance Program Regulations
and Flood Hazard Management Program Model By Laws for Floodplain
Districts, Article III Notification of Watercourse Alteration. 7. Floodway Data. In Zones A, A1-30, and AE, along with 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. 8. Base Flood Elevation Data. Base flood elevation data is required for subdivision
proposals or other developments greater than 50 lots or 5 acres, whichever is the
lesser. 9.2.6 Exceptions. The following exceptions are specifically exempted from Section 9.2:
9-6
1.