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iMap updated: April 8, 2026<\/SPAN><\/P>

This layer represents mapped alluvial fan areas compiled from multiple sources:<\/SPAN><\/P>

  • Oyster River alluvial fan derived from Kerr Wood Leidal (2021) Coastal Flood Mapping Project (Technical Memorandum #2 \u2013 Fluvial and Coastal Geomorphology)<\/SPAN><\/P><\/LI>

  • Additional alluvial fan features derived from the Province of BC Flood Hazard Mapping dataset (2004)<\/SPAN><\/P><\/LI><\/UL>

    Alluvial fans are geomorphic features formed by sediment deposition where watercourses exit confined valleys. These areas may be subject to flooding, sediment deposition, channel avulsion, and debris flow hazards.<\/SPAN><\/P>

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    iMap updated: March 25, 2026<\/SPAN><\/P>

    These red lines delineate the limits of the coastal zones which are segments of the shoreline which have similar topography and wave exposure and therefore have similar wave effects. The Coastal Flood Level is constant within a Coastal Zone.<\/SPAN><\/P>

    Further information of Coastal Zones is provided in Technical Memorandum #4 \u2013 Coastal Modelling and Technical Memorandum #5 \u2013 Coastal and Fluvial Mapping Products (Appendix E and F).<\/SPAN><\/P>

    Coastal Zone Boundary: Basemapping.gdb [ArcGIS File Geodatabase Feature Class CoastalZone (polyline)]<\/SPAN><\/P>

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    Coastal setbacks have been defined for the same sea level rise and storm scenario as depicted in the regulatory floodplain mapping: 1 m of SLR and 0.5% AEP water level and storm event.<\/SPAN><\/SPAN><\/P>

    Setbacks are depicted as the greater of 15 m from the future estimated natural boundary of the sea with 1 m of SLR, or landward of the location where the natural ground elevation contour is equivalent to the floodplain limit with 1 m of SLR. A freeboard allowance of 0.6 m is included when estimating the floodplain limit with 1 m of SLR. For the special case of topographic plateaus, the floodplain limit has been established as the elevation of the seaward crest of the plateau plus freeboard, or the elevation of the shoreward extent of overland flooding plus freeboard, whichever is greater. The location of the future estimated natural boundary of the sea with 1 m of SLR is estimated as the elevation of the wave runup exceeded by 50% of the waves (R<\/SPAN><\/SPAN>50% <\/SPAN><\/SPAN>= R<\/SPAN><\/SPAN>2%<\/SPAN><\/SPAN>/2.2) for the 0.5% AEP storm event (Ausenco Sandwell, 2011).<\/SPAN><\/SPAN><\/P>

    For areas with coastal bluffs that are steeper than 3 (Horizontal) to 1 (Vertical) and have a height in excess of 3 m, setbacks have been determined with the following criteria:<\/SPAN><\/SPAN><\/P>

    • If the future estimated natural boundary is located at least 15 m seaward of the toe of the bluff, then no special bluff setback has been defined and the setback is defined as per above. <\/SPAN><\/SPAN><\/P><\/LI><\/UL>

      • If the future estimated natural boundary is located 15m or less seaward of the toe of the bluff, then the setback from the future estimated natural boundary has been located at a horizontal distance of 3 times the height of the bluff, measured from 15 m landwards from the location of the future estimated natural boundary.<\/SPAN><\/SPAN><\/P><\/LI><\/UL><\/DIV><\/DIV><\/DIV>", "geometryType": "esriGeometryPolyline", "sourceSpatialReference": { "wkid": 26910, "latestWkid": 26910, "xyTolerance": 0.001, "zTolerance": 0.001, "mTolerance": 0.001, "falseX": -5120900, "falseY": -9998100, "xyUnits": 10000, "falseZ": 0, "zUnits": 1, "falseM": 0, "mUnits": 1 }, "copyrightText": "Kerr Wood Leidal Associates Ltd.", "parentLayer": { "id": 118, "name": "--Designated Floodplains--" }, "subLayers": [], "minScale": 125000, "maxScale": 0, "referenceScale": 4000.0, "drawingInfo": { "renderer": { "type": "simple", "symbol": { "type": "esriSLS", "style": "esriSLSDash", "color": [ 225, 225, 225, 255 ], "width": 1.4 }, "label": "Coastal Floodplain Setback Line" }, "scaleSymbols": true, "transparency": 0, "labelingInfo": null }, "defaultVisibility": true, "extent": { "xmin": 347053.0234000003, "ymin": 5479130.534499999, "xmax": 385297.22950000037, "ymax": 5527362.6786, "spatialReference": { "wkid": 26910, "latestWkid": 26910, "xyTolerance": 0.001, "zTolerance": 0.001, "mTolerance": 0.001, "falseX": -5120900, "falseY": -9998100, "xyUnits": 10000, "falseZ": -100000, "zUnits": 10000, "falseM": -100000, "mUnits": 10000 } }, "hasAttachments": false, "htmlPopupType": "esriServerHTMLPopupTypeAsHTMLText", "displayField": "Shape_Leng", "typeIdField": null, "subtypeFieldName": null, "subtypeField": null, "defaultSubtypeCode": null, "fields": [ { "name": "OBJECTID", "type": "esriFieldTypeOID", "alias": "OBJECTID", "domain": null }, { "name": "AdminArea", "type": "esriFieldTypeString", "alias": "AdminArea", "length": 255, "domain": null }, { "name": "Shape", "type": "esriFieldTypeGeometry", "alias": "Shape", "domain": null } ], "geometryField": { "name": "Shape", "type": "esriFieldTypeGeometry", "alias": "Shape" }, "indexes": [ { "name": "R1793_pk", "fields": "OBJECTID", "isAscending": true, "isUnique": true, "description": "" }, { "name": "S1581_idx", "fields": "Shape", "isAscending": true, "isUnique": true, "description": "" } ], "subtypes": [], "relationships": [], "canModifyLayer": true, "canScaleSymbols": true, "hasLabels": false, "capabilities": "Map,Query,Data", "maxRecordCount": 2000, "supportsStatistics": true, "supportsAdvancedQueries": true, "supportedQueryFormats": "JSON, geoJSON, PBF", "isDataVersioned": false, "ownershipBasedAccessControlForFeatures": {"allowOthersToQuery": true}, "useStandardizedQueries": true, "advancedQueryCapabilities": { "useStandardizedQueries": true, "supportsStatistics": true, "supportsHavingClause": true, "supportsOrderBy": true, "supportsDistinct": true, "supportsCountDistinct": true, "supportsPagination": true, "supportsTrueCurve": true, "supportsQueryWithDatumTransformation": true, "supportsReturningQueryExtent": true, "supportsQueryWithDistance": true, "supportsSqlExpression": true }, "supportsDatumTransformation": true, "dateFieldsTimeReference": null, "hasMetadata": true, "isDataArchived": false, "archivingInfo": { "supportsQueryWithHistoricMoment": false, "startArchivingMoment": -1 }, "supportsCoordinatesQuantization": true, "supportsDynamicLegends": true }, { "currentVersion": 10.8, "cimVersion": "2.5.0", "id": 115, "name": "Designated Floodplains", "type": "Feature Layer", "description": "

        iMap updated: April 8, 2026<\/SPAN><\/P>

        This dataset represents the official digital floodplain boundaries designated under Section 301 (Floodplain Designation) of the Comox Valley Regional District Floodplain Bylaw No. 890.<\/SPAN><\/P>

        The dataset consolidates floodplain mapping from multiple source studies, including:<\/SPAN><\/P>

        \u2022 Schedule B \u2013 Designated Floodplain Mapping (2021)<\/SPAN><\/P>

        \u2022 Schedule C \u2013 Puntledge, Courtenay, and Tsolum Rivers Floodplain (1991)<\/SPAN><\/P>

        \u2022 Schedule D \u2013 Oyster River Floodplain (1984)<\/SPAN><\/P>

        Where multiple mapping sources exist, the spatial extents reflect the priority rules established in Section 301 of the bylaw.<\/SPAN><\/P>

        Floodplain designation includes mapped flood extents as well as areas below Flood Construction Levels (FCL) and areas within prescribed setbacks. FCL and setback areas are maintained as separate rule-based datasets for operational purposes but form part of the overall floodplain designation.<\/SPAN><\/P>

        This dataset constitutes the authoritative digital record used for administering Floodplain Bylaw No. 890.<\/SPAN><\/P><\/DIV><\/DIV><\/DIV>", "geometryType": "esriGeometryPolygon", "sourceSpatialReference": { "wkid": 26910, "latestWkid": 26910, "vcsWkid": 115702, "latestVcsWkid": 115702, "xyTolerance": 0.001, "zTolerance": 0.001, "mTolerance": 0.001, "falseX": -5120900, "falseY": -9998100, "xyUnits": 10000, "falseZ": 0, "zUnits": 1, "falseM": 0, "mUnits": 1 }, "sourceHeightModelInfo": { "heightModel": "ellipsoidal", "vertCRS": "NAD_1983", "heightUnit": "meter" }, "copyrightText": "Comox Valley Regional District", "parentLayer": { "id": 118, "name": "--Designated Floodplains--" }, "subLayers": [], "minScale": 125000, "maxScale": 0, "referenceScale": 4000.0, "drawingInfo": { "renderer": { "type": "uniqueValue", "field1": "Rule_Name", "field2": "Rule_ID", "uniqueValueInfos": [ { "symbol": { "type": "esriSFS", "style": "esriSFSSolid", "color": [ 255, 255, 149, 255 ], "outline": { "type": "esriSLS", "style": "esriSLSSolid", "color": [ 255, 255, 0, 255 ], "width": 0.5 } }, "value": "Schedule B - Designated Floodplain Mapping (2021);Coastal Floodplain", "label": "Schedule B - Coastal Floodplain (2021)" }, { "symbol": { "type": "esriSFS", "style": "esriSFSSolid", "color": [ 182, 162, 193, 255 ], "outline": { "type": "esriSLS", "style": "esriSLSSolid", "color": [ 182, 162, 193, 255 ], "width": 0.5 } }, "value": "Schedule B - Designated Floodplain Mapping (2021);Riverine Flooplain", "label": "Schedule B - Riverine Flooplain (2021)" }, { "symbol": { "type": "esriSFS", "style": "esriSFSSolid", "color": [ 146, 132, 49, 255 ], "outline": { "type": "esriSLS", "style": "esriSLSSolid", "color": [ 146, 132, 49, 255 ], "width": 0.5 } }, "value": "Schedule C - Courtenay, Puntledge & Tsolum Rivers Floodplain (1991);Legacy Riverine Floodplain", "label": "Schedule C - Riverine Floodplain (Courtenay, Puntledge & Tsolum Rivers: 1991)" }, { "symbol": { "type": "esriSFS", "style": 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