City of Newton, MA
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Floodplains in Newton, Massachusetts as defined in Newton's Floodplain Ordinance of 2010. The ordinance defines floodways as the 100 year floodplain as defined in FEMA's Flood Insurance Rate (FIRM) Maps. These correspond to Zone AE on those maps. In addition, the ordinance lists most streams, not studied on the FIRM's by name and established as 30 foot corridors or buffers around each one. LiDAR elevations were used to more accurately depict the boundaries where listed by elevation in the ordinance.
In March 2023 the FEMA zone boundaries were updated to reflect the August, 2021 preliminary mapping updates as directed by the Conservation Planner.
Features and Attributes
Polygons represent the extent of flood plains. Attributes indicate type of flood plain or wetland.
| Name | Alias | Description | Data Type | Width |
|---|---|---|---|---|
| ClassNum | ClassNum | References a missing lookup table | Integer | 5 |
| Feature | Feature | Type of wetland-lowland, water, etc | Text | 10 |
| ***valid values*** | ||||
| CULVERT | ||||
| LOWLAND | ||||
| OPEN WATER | ||||
| STREAM | ||||
| OrdinanceCat | Ordinance Category | Floodplain Ordinance Category | Integer | 5 |
| ***valid values*** | ||||
| 1 | Floodplain Watersheds | |||
| 2 | Floodways | |||
| 3 | Open brook or stream watersheds | |||
| 4 | Wetlands | |||
| 5 | Ponds | |||
| OrdSection | Ordinance Section | Floodplain Ordinance Section | Text | 12 |
Last Updated: March, 2023