Description: This layer contains information about station starting locations. These locations indicate the reference point that was used as the origin for distance measurements along streams and rivers.
Copyright Text: Federal Emergency Management Agency
Description: The spatial entities representing the river marks are points. The points are generally located along the centerline of the river at regular intervals.
Copyright Text: Federal Emergency Management Agency
Description: The spatial elements representing Base Flood Elevation (BFE) features are lines extending from Special Flood Hazard Area (SFHA) boundary to SFHA boundary. The ends of the BFE lines must be snapped precisely to the SFHA boundary. Each BFE is represented by a single line with no pseudo-nodes. Where BFE lines are shown, they must be consistent with procedures described in the FIRM Panel Technical Reference.
Service Item Id: dd607f6f29e640309d196096c95db4de
Copyright Text: Federal Emergency Management Agency
Description: This layer contains information about cross section lines. This information is used in the Floodway Data Tables in the FIS Report, as well as on the FIRM panels. Database attributes reflect the final regulatory water surface elevations and are consistent with values in the floodway data tables and flood profiles, where applicable.
Copyright Text: Federal Emergency Management Agency
Description: This layer includes all structures shown on the flood profiles, with the exception of riverine or coastal levees, floodwalls and closure structures. In addition, channels that contain flooding and other significant flood control structures shown on the FIRM, are included. Spatial elements representing general structures are represented by lines. The lines represent the primary characteristic of the structure. For example, bridges are represented by the transportation centerline carried by the bridge. Dams are represented by a line corresponding to the top of the dam. A line corresponding to the centerline of the main barrel represents a culvert.
Copyright Text: Federal Emergency Management Agency
Description: This layer contains information about levees shown on the FIRMs that are accredited and known to be protecting against the 1-percent-annual-chance flood, as well as levees that are provisionally accredited, de-accredited and never accredited. The purpose of this table is to document the accreditation status of levees, as well as associated information necessary to be shown on the Final Flood Insurance Rate Map (FIRM) and for the population of FIS Report text related to levee structures. The spatial entities representing levees are lines, drawn at the centerline of levees, floodwalls and levee closure structures.
Copyright Text: Federal Emergency Management Agency
Description: The spatial entities representing the profile baseline are lines. Profile baselines are to be stored in Polyline ZM feature classes, storing both profile station values (M-values) and 1-percent-annual-chance water-surface elevations (Z-values) at cross sections, structures and other modeled inflection points.For new models and effective models with valid profile baselines, vertices along the profile baseline are to be calibrated between cross sections and structures using linear referencing / dynamic segmentation tools in GIS. The first vertex of each profile baseline will be the downstream most point on the profile.
Copyright Text: Federal Emergency Management Agency
Description: This layer contains information about the transect baseline used in the coastal flood hazard model. Typically, the it represents the 0.0-foot elevation contour, the starting point for the transect and the measuring point for the coastal mapping. The spatial elements representing the transect baselines are lines. The file describes the transect baseline profile setting and must also include a reference to the vertical datum. When a coastal transect baseline and water lines are available for the same study reach, only the transect baseline shall be shown on the FIRM in order to eliminate overlaps.
Copyright Text: Federal Emergency Management Agency
Description: This is a polygon layer of seclusion areas. Seclusion mapping is applicable to studies placed on hold during the development and implementation of the updated levee analysis and mapping procedures. Seclusion mapping is a program management solution, not a technical solution, and it will only be applied to areas that will be affected by the updated levee analysis and mapping procedures. FEMA intends to remap these areas and will prioritize studies accordingly, as resources and commitments allow. Flood hazards will not be updated immediately within secluded areas; therefore, flood insurance and mitigation requirements will remain the same until a revised study applying the updated levee analysis and mapping procedures revises the flood hazard data and becomes effective.
Copyright Text: Federal Emergency Management Agency
Description: The layer contains information about the flood zone boundary features for the Flood Risk Project area. Flood hazard data should not be shown beyond the extent of the county/community boundary. If the modeled information extends beyond the political area, the flood hazard data should be clipped to the political boundary. The spatial elements representing the boundaries of the flood hazard areas depicted on the FIRM are lines.
Service Item Id: dd607f6f29e640309d196096c95db4de
Copyright Text: Federal Emergency Management Agency
Description: The Federal Emergency Management Agency (FEMA) produces Flood Insurance Rate maps and identifies Special Flood Hazard Areas as part of the National Flood Insurance Program's floodplain management. Special Flood Hazard Areas have regulations that include the mandatory purchase of flood insurance.This layer is derived from the 2019 version of the National Flood Hazard Layer feature class S_Fld_Haz_Ar. The Planning and Development Services (PDS) GIS team included an additional column - "LABEL" - which aggregates the flood zone and zone subtypes categories into eight classes, which can be used for visual cartographic display purposes, and inclusion in the AMANDA property info table that is updated nightly by the gis2monster process.This data was adopted as part of the Snohomish County Code on 6/13/2020.
Service Item Id: dd607f6f29e640309d196096c95db4de
Copyright Text: Snohomish County, Planning and Development Services (PDS), 2020
Federal Emergency Management Agency (FEMA), 2019
Value: AE,100-year Floodplain (Combined River and Coastal Floodplain) Label: Zone AE: Combined Riverine and Coastal Floodplain Description: N/A Symbol:
Description: This layer is a polygon layer of merged types/areas of flood hazard data from 2005. The data types include Density Fringe Area, Floodway Area, Floodway Fringe Area, Outside Flood Hazard Area, and Puget Sound. The layer is clipped to the Snohomish County boundary.
Service Item Id: dd607f6f29e640309d196096c95db4de
Copyright Text: Federal Emergency Management Agency
Description: The spatial entities representing FIRM panels are polygons. The polygon for the FIRM panel corresponds to the panel neatlines. FIRM panels must not overlap or have gaps within a study. In situations where a portion of a panel lies outside the jurisdiction being mapped, the user must refer to the S_Pol_Ar table to determine the portion of the panel area where the FIRM Database shows the effective flood hazard data for the mapped jurisdiction.
Service Item Id: dd607f6f29e640309d196096c95db4de
Copyright Text: Federal Emergency Management Agency
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