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Floodplain_KWL
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337080.364500
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5479130.534500
5529708.410200
1
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GCS_North_American_1983
Linear Unit: Meter (1.000000)
NAD_1983_UTM_Zone_10N
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20260408
10173100
20260408
10173100
150000000
5000
FGDC
Esri ArcGIS 12.9.7.32739
Floodplain_FloodExtents_2021
1
-125.268568
-124.581526
49.908764
49.442985
Kerr Wood Leidal Associates Ltd. (KWL)
Source data derived from:
Coastal Flood Mapping Project (2021)
Technical Memorandum #5 – Coastal and Fluvial Mapping Products
Prepared for the Comox Valley Regional District (CVRD)
floodplain; coastal flood; inundation; flood extent
This dataset represents the modeled coastal floodplain extents derived from the Kerr Wood Leidal (KWL) Coastal Flood Mapping Study (2021).
The floodplain is based on a 0.5% Annual Exceedance Probability (AEP) coastal flood event including sea level rise and freeboard.
Within CVRD, this layer is used to represent the physical flood extent (water inundation) for reference and analysis purposes.
Regulatory flood hazard areas used for development and permitting are defined separately under CVRD Bylaw 890 and may differ from this mapped floodplain.
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>This feature class contains polygon representations of modeled coastal flood extents developed by Kerr Wood Leidal (KWL) as part of the Coastal Flood Mapping Project (2021).</SPAN></P><P><SPAN>The flood extents are derived from the regulatory coastal flood limit linework and represent the spatial extent of inundation under the modeled scenario, which includes:</SPAN></P><P><SPAN>- 0.5% Annual Exceedance Probability (AEP) storm event (200-year return period)</SPAN></P><P><SPAN>- 1.0 m sea level rise</SPAN></P><P><SPAN>- 0.6 m freeboard allowance</SPAN></P><P><SPAN>The polygons were generated for mapping and visualization purposes using the flood limit linework and shoreline closure, and do not represent dynamic flood timing or wave processes across the study area.</SPAN></P><P><SPAN>In KWL documentation, these extents are described as “regulatory floodplain extents” because they are used to inform flood construction levels (FCLs) and support regulatory planning. However, within CVRD systems, this dataset is maintained as a representation of modeled flood inundation (water extent), separate from regulatory development boundaries.</SPAN></P><P><SPAN>Users should be aware that the flood extents represent a modeled scenario and may not reflect all local conditions or future changes. Flood levels may vary spatially and temporally, and peak water levels may not occur simultaneously across the entire mapped area.</SPAN></P><P><SPAN>For regulatory development constraints, refer to the Building_DesignatedFloodplains dataset, which incorporates bylaw-based hazard areas including coastal setbacks and additional planning considerations.</SPAN></P></DIV></DIV></DIV>
<DIV STYLE="text-align:Left;"><DIV><P><SPAN>This dataset is provided for reference, visualization, and planning support purposes only.</SPAN></P><P><SPAN>This layer represents modeled flood inundation extents and should not be interpreted as the regulatory flood hazard area for development or permitting.</SPAN></P><P><SPAN>Regulatory flood hazard areas are defined under CVRD Bylaw 890 and are maintained separately.</SPAN></P><P><SPAN>Users are responsible for verifying the suitability of this data for their specific use. The CVRD makes no guarantees regarding the accuracy or completeness of this dataset for site-specific analysis.</SPAN></P><P><SPAN>This dataset should not be used as a substitute for detailed engineering studies, site-specific assessments, or legal boundary determination.</SPAN></P></DIV></DIV>
Enterprise Geodatabase Feature Class
dataset
EPSG
6.13(3.0.1)
0
Simple
FALSE
0
TRUE
FALSE
Floodplain_KWL
Feature Class
0
OBJECTID
OBJECTID
OID
4
10
0
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
Shape
Shape
Geometry
8
0
0
Feature geometry.
Esri
Coordinates defining the features.
Source_Org
Source Organization
String
100
0
0
Source_Project
Source Project
String
150
0
0
Source_Doc
Source Document
String
150
0
0
Source_Date
Source Date
Date
8
0
0
Source_URL
Source Layer Path
String
255
0
0
Product_Type
Product Type
String
40
0
0
Product_Name
Product Name
String
150
0
0
Data_Status
Data Status
String
20
0
0
Use_Type
Use Type
String
30
0
0
Scenario_Label
Flood Scenario
String
80
0
0
Scenario_Ref
Scenario Reference
String
60
0
0
Datum_Note
Datum Note
String
255
0
0
Import_Date
Date Imported
Date
8
0
0
Notes
Important Information
String
350
0
0
Caveat
Caveat/Limitations
String
350
0
0
created_user
created_user
String
255
0
0
created_date
created_date
Date
8
0
0
last_edited_user
last_edited_user
String
255
0
0
Source_Name
Source Layer Name
String
100
0
0
Mapping_Scale
Mapping Scale
String
50
0
0
last_edited_date
last_edited_date
Date
8
0
0
Shape.STArea()
Shape.STArea()
Double
0
0
0
Shape.STLength()
Shape.STLength()
Double
0
0
0
20260408
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Dataset delivered in NAD_1983_UTM_Zone_10N in accordance with contract specifications. Source modelling referenced in Technical Memorandum #5 was conducted in NAD83(CSRS) UTM Zone 10 and CGVD2013 vertical datum.