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You should independently verify the accuracy of any information before taking any action in reliance upon it.Read full disclaimer here.Abstract:200 Year Flood Hazard data which incorporates the combined output of the three modelling methods used: Localised flooding, Ashley Breakout flooding, and Coastal flooding (see links below to explore the model types individually).The maps show modelled water depths for 200 year average recurrence interval floods.The terms Average Recurrence Interval (ARI) and Annual Exceedance Probability (AEP) describe the probability of a flow of a certain size occurring in any river or stream. ARI is the average time period between floods of a certain size. For example a 200-year ARI flow will occur on average once every 200 years. Alternatively, AEP is the probability of a certain size of flood flow occurring in a single year. A 0.5 per cent AEP flood flow has a 0.5 per cent, or 1-in-200 chance of occurring in any one year, and a 5 per cent chance of occurring in any 10 year period.1. Localised Flooding. This is flooding due to the direct result of rainfall falling on the ground. This type of flooding is sometimes referred to as Pluvial Flooding.2. Ashley Breakout Flooding. This is flooding due to a stopbank breach on the Ashley River. These flood events include flow directly from a stopbank breach plus localised rainfall that would occur at the same time. This type of flooding is sometimes referred to as Fluvial Flooding. The Pluvial Flooding component of these scenarios was 10% of the Fluvial component (ie a 200 year breakout was modelled in conjunction with a 20 year localised rain event).3. Coastal Flooding. This type of flooding can occur in the coastal regions of the district and is due to the interaction between storm surge, river flows from the Ashley and Waimakariri Rivers plus groundwater effects. Storm surge was the overriding component of these models. A 100 year storm surge was modelled in conjunction with a 20 year river flow. The groundwater component was modelled assuming median groundwater levels (adjusted for climate change impacts).The flooding has been classified as follows:High Hazard \u2013 Extremely high depth and/or water velocity. Potential for significant damage to buildings due to scour, flotation and debris impact. Possible danger to personal safety. Evacuation by trucks and/or wading difficult. High potential for water ingress into buildings.Medium Hazard \u2013 Depth greater than 0.3m. Evacuation by light vehicles difficult due to flotation. Wading generally possible. Small likelihood of damage to structures. Potential for water ingress into buildings.Low \u2013 Depth less than 0.3m. Evacuation by all vehicles generally possible. Wading possible. 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Your use of this information is entirely at your own risk. You should independently verify the accuracy of any information before taking any action in reliance upon it.Read full disclaimer here.Abstract:500 Year Flood Hazard data which incorporates the combined output of the three modelling methods used: Localised flooding, Ashley Breakout flooding, and Coastal flooding (see links below to explore the model types individually).The maps show modelled water depths for 500 year average recurrence interval floods.The terms Average Recurrence Interval (ARI) and Annual Exceedance Probability (AEP) describe the probability of a flow of a certain size occurring in any river or stream. ARI is the average time period between floods of a certain size. For example a 500-year ARI flow will occur on average once every 500 years. Alternatively, AEP is the probability of a certain size of flood flow occurring in a single year. A 0.5 per cent AEP flood flow has a 0.5 per cent, or 1-in-500 chance of occurring in any one year, and a 5 per cent chance of occurring in any 10 year period.1. Localised Flooding. This is flooding due to the direct result of rainfall falling on the ground. This type of flooding is sometimes referred to as Pluvial Flooding.2. Ashley Breakout Flooding. This is flooding due to a stopbank breach on the Ashley River. These flood events include flow directly from a stopbank breach plus localised rainfall that would occur at the same time. This type of flooding is sometimes referred to as Fluvial Flooding. The Pluvial Flooding component of these scenarios was 10% of the Fluvial component (ie a 200 year breakout was modelled in conjunction with a 20 year localised rain event).3. Coastal Flooding. This type of flooding can occur in the coastal regions of the district and is due to the interaction between storm surge, river flows from the Ashley and Waimakariri Rivers plus groundwater effects. Storm surge was the overriding component of these models. A 100 year storm surge was modelled in conjunction with a 20 year river flow. The groundwater component was modelled assuming median groundwater levels (adjusted for climate change impacts).The flooding has been classified as follows:High Hazard \u2013 Extremely high depth and/or water velocity. Potential for significant damage to buildings due to scour, flotation and debris impact. Possible danger to personal safety. Evacuation by trucks and/or wading difficult. High potential for water ingress into buildings.Medium Hazard \u2013 Depth greater than 0.3m. Evacuation by light vehicles difficult due to flotation. Wading generally possible. Small likelihood of damage to structures. Potential for water ingress into buildings.Low \u2013 Depth less than 0.3m. Evacuation by all vehicles generally possible. Wading possible. 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Your use of this information is entirely at your own risk. You should independently verify the accuracy of any information before taking any action in reliance upon it. This flood information is based on modelling outputs and the accuracy of this data is limited by the assumptions used in the model. The WDC reserves the right to update this information and cannot guarantee that the information is accurate and up to date at all times. An experienced practitioner should be consulted if this information is to be used for Building or Development purposes. A site specific study may be required in some instances. Please refer to the District Plan and the Council\u2019s Planning Unit if you wish to use this information for planning purposes. Anyone who acts on any of this information does so at their own risk.Read full disclaimer here.Abstract:The purpose of this investigation was to model the flood effects across the District for the 100, 200 and 500 ARI (Annual Recurrence Interval) rain events. The maximum flood depths and corresponding maximum velocities would be used to generate a map of flood hazards. The flood hazard maps would be used in Council planning documents and form a layer on the Council GIS to be used in Council LIMs.Full Catchment Models have been produced that model the full district north and south of the Ashley River. Only the Lees Valley catchment upstream of Ashley Gorge has not been included due to insufficient ground data being available. Update Frequency:As RequiredPoint of Contact:Waimakariri District CouncilLineage:Flood modelling has been completed for all areas of the Waimakariri District with the exception of Lees Valley and flood exclusion zones (the flood exclusion zones are areas where the modelling has not been undertaken as these areas have recently had their land levels altered). Efforts have been made to update the Flood Modelling for new and proposed development areas, however the modelling may not be accurate in all areas where development has occurred since 2014.", "geometryType": null, "copyrightText": "DHI, WDC, & ECAN", "parentLayer": null, "subLayers": [], "minScale": 0, "maxScale": 0, "defaultVisibility": true, "extent": { "xmin": 1514260.0562996608, "ymin": 5188110.1959018875, "xmax": 1579455.0562996608, "ymax": 5246550.1959018875, "spatialReference": { "wkid": 2193, "latestWkid": 2193, "xyTolerance": 0.001, "zTolerance": 0.001, "mTolerance": 0.001, "falseX": -4020900, "falseY": 1900, "xyUnits": 10000, "falseZ": -100000, "zUnits": 10000, "falseM": -100000, "mUnits": 10000 } }, "hasAttachments": false, "htmlPopupType": "esriServerHTMLPopupTypeNone", "displayField": "", "typeIdField": null, "subtypeFieldName": null, "subtypeField": null, "defaultSubtypeCode": null, "fields": null, "geometryField": {}, "indexes": [], "subtypes": [], "relationships": [], "canModifyLayer": false, "canScaleSymbols": false, "hasLabels": false, "capabilities": "Query,Map", "supportsStatistics": false, "supportsExceedsLimitStatistics": false, "supportsAdvancedQueries": false, "supportedQueryFormats": "JSON, geoJSON, PBF", "isDataVersioned": false, "ownershipBasedAccessControlForFeatures": {"allowOthersToQuery": true}, "useStandardizedQueries": true, "advancedQueryCapabilities": { "useStandardizedQueries": true, "supportsStatistics": false, "supportsPercentileStatistics": false, "supportsHavingClause": false, "supportsOrderBy": false, "supportsDistinct": false, "supportsCountDistinct": false, "supportsAdvancedQueryRelated": true, "supportsQueryRelatedPagination": true, "supportsPagination": false, "supportsLod": false, "supportsQueryWithLodSR": false, "supportsTrueCurve": true, "supportsQueryWithDatumTransformation": true, "supportsReturningQueryExtent": true, "supportsQueryWithDistance": true, "supportsSqlExpression": false, "supportsTimeRelation": true, "supportsSqlFormat": false, "supportsQueryAnalytic": false, "supportsCurrentUserQueries": true }, "supportsDatumTransformation": true, "dateFieldsTimeReference": null, "preferredTimeReference": null, "datesInUnknownTimezone": false, "hasMetadata": true, "isDataArchived": false, "archivingInfo": { "supportsQueryWithHistoricMoment": false, "startArchivingMoment": -1 }, "supportsCoordinatesQuantization": true, "supportsDynamicLegends": true }, { "currentVersion": 11.5, "cimVersion": "3.5.0", "id": 3, "name": "200 Year Ashley Breakout Flood Depth", "type": "Raster Layer", "description": "While the Waimakariri District Council has taken all reasonable care in providing correct information, all information should be considered as being illustrative and indicative only. Your use of this information is entirely at your own risk. You should independently verify the accuracy of any information before taking any action in reliance upon it. This flood information is based on modelling outputs and the accuracy of this data is limited by the assumptions used in the model. The WDC reserves the right to update this information and cannot guarantee that the information is accurate and up to date at all times. An experienced practitioner should be consulted if this information is to be used for Building or Development purposes. A site specific study may be required in some instances. Please refer to the District Plan and the Council\u2019s Planning Unit if you wish to use this information for planning purposes. Anyone who acts on any of this information does so at their own risk.Read full disclaimer here.Abstract:The purpose of this investigation was to model the flood effects across the District for the 100, 200 and 500 ARI (Annual Recurrence Interval) rain events. The maximum flood depths and corresponding maximum velocities would be used to generate a map of flood hazards. The flood hazard maps would be used in Council planning documents and form a layer on the Council GIS to be used in Council LIMs.Full Catchment Models have been produced that model the full district north and south of the Ashley River. Only the Lees Valley catchment upstream of Ashley Gorge has not been included due to insufficient ground data being available. Update Frequency:As RequiredPoint of Contact:Waimakariri District CouncilLineage:Flood modelling has been completed for all areas of the Waimakariri District with the exception of Lees Valley and flood exclusion zones (the flood exclusion zones are areas where the modelling has not been undertaken as these areas have recently had their land levels altered). Efforts have been made to update the Flood Modelling for new and proposed development areas, however the modelling may not be accurate in all areas where development has occurred since 2014.", "geometryType": null, "copyrightText": "DHI, WDC, & ECAN", "parentLayer": null, "subLayers": [], "minScale": 0, "maxScale": 0, "defaultVisibility": true, "extent": { "xmin": 1537175.0562996608, "ymin": 5195900.1959018875, "xmax": 1578960.0562996608, "ymax": 5213870.1959018875, "spatialReference": { "wkid": 2193, "latestWkid": 2193, "xyTolerance": 0.001, "zTolerance": 0.001, "mTolerance": 0.001, "falseX": -4020900, "falseY": 1900, "xyUnits": 10000, "falseZ": -100000, "zUnits": 10000, "falseM": -100000, "mUnits": 10000 } }, "hasAttachments": false, "htmlPopupType": "esriServerHTMLPopupTypeNone", "displayField": "", "typeIdField": null, "subtypeFieldName": null, "subtypeField": null, "defaultSubtypeCode": null, "fields": null, "geometryField": {}, "indexes": [], "subtypes": [], "relationships": [], "canModifyLayer": false, "canScaleSymbols": false, "hasLabels": false, "capabilities": "Query,Map", "supportsStatistics": false, "supportsExceedsLimitStatistics": false, "supportsAdvancedQueries": false, "supportedQueryFormats": "JSON, geoJSON, PBF", "isDataVersioned": false, "ownershipBasedAccessControlForFeatures": {"allowOthersToQuery": true}, "useStandardizedQueries": true, "advancedQueryCapabilities": { "useStandardizedQueries": true, "supportsStatistics": false, "supportsPercentileStatistics": false, "supportsHavingClause": false, "supportsOrderBy": false, "supportsDistinct": false, "supportsCountDistinct": false, "supportsAdvancedQueryRelated": true, "supportsQueryRelatedPagination": true, "supportsPagination": false, "supportsLod": false, "supportsQueryWithLodSR": false, "supportsTrueCurve": true, "supportsQueryWithDatumTransformation": true, "supportsReturningQueryExtent": true, "supportsQueryWithDistance": true, "supportsSqlExpression": false, "supportsTimeRelation": true, "supportsSqlFormat": false, "supportsQueryAnalytic": false, "supportsCurrentUserQueries": true }, "supportsDatumTransformation": true, "dateFieldsTimeReference": null, "preferredTimeReference": null, "datesInUnknownTimezone": false, "hasMetadata": true, "isDataArchived": false, "archivingInfo": { "supportsQueryWithHistoricMoment": false, "startArchivingMoment": -1 }, "supportsCoordinatesQuantization": true, "supportsDynamicLegends": true }, { "currentVersion": 11.5, "cimVersion": "3.5.0", "id": 5, "name": "200 Year Coastal Flood Depth", "type": "Raster Layer", "description": "While the Waimakariri District Council has taken all reasonable care in providing correct information, all information should be considered as being illustrative and indicative only. Your use of this information is entirely at your own risk. You should independently verify the accuracy of any information before taking any action in reliance upon it. This flood information is based on modelling outputs and the accuracy of this data is limited by the assumptions used in the model. The WDC reserves the right to update this information and cannot guarantee that the information is accurate and up to date at all times. An experienced practitioner should be consulted if this information is to be used for Building or Development purposes. A site specific study may be required in some instances. Please refer to the District Plan and the Council\u2019s Planning Unit if you wish to use this information for planning purposes. Anyone who acts on any of this information does so at their own risk.Read full disclaimer here.Abstract:The purpose of this investigation was to model the flood effects across the District for the 100, 200 and 500 ARI (Annual Recurrence Interval) rain events. The maximum flood depths and corresponding maximum velocities would be used to generate a map of flood hazards. The flood hazard maps would be used in Council planning documents and form a layer on the Council GIS to be used in Council LIMs.Full Catchment Models have been produced that model the full district north and south of the Ashley River. Only the Lees Valley catchment upstream of Ashley Gorge has not been included due to insufficient ground data being available. Update Frequency:As RequiredPoint of Contact:Waimakariri District CouncilLineage:Flood modelling has been completed for all areas of the Waimakariri District with the exception of Lees Valley and flood exclusion zones (the flood exclusion zones are areas where the modelling has not been undertaken as these areas have recently had their land levels altered). Efforts have been made to update the Flood Modelling for new and proposed development areas, however the modelling may not be accurate in all areas where development has occurred since 2014.", "geometryType": null, "copyrightText": "DHI, WDC, & ECAN", "parentLayer": null, "subLayers": [], "minScale": 0, "maxScale": 0, "defaultVisibility": true, "extent": { "xmin": 1569421.5244, "ymin": 5193731.567729, "xmax": 1579366.5244, "ymax": 5213946.567729, "spatialReference": { "wkid": 2193, "latestWkid": 2193, "xyTolerance": 0.001, "zTolerance": 0.001, "mTolerance": 0.001, "falseX": -4020900, "falseY": 1900, "xyUnits": 10000, "falseZ": -100000, "zUnits": 10000, "falseM": -100000, "mUnits": 10000 } }, "hasAttachments": false, "htmlPopupType": "esriServerHTMLPopupTypeNone", "displayField": "", "typeIdField": null, "subtypeFieldName": null, "subtypeField": null, "defaultSubtypeCode": null, "fields": null, "geometryField": {}, "indexes": [], "subtypes": [], "relationships": [], "canModifyLayer": false, "canScaleSymbols": false, "hasLabels": false, "capabilities": "Query,Map", "supportsStatistics": false, "supportsExceedsLimitStatistics": false, "supportsAdvancedQueries": false, "supportedQueryFormats": "JSON, geoJSON, PBF", "isDataVersioned": false, "ownershipBasedAccessControlForFeatures": {"allowOthersToQuery": true}, "useStandardizedQueries": true, "advancedQueryCapabilities": { "useStandardizedQueries": true, "supportsStatistics": false, "supportsPercentileStatistics": false, "supportsHavingClause": false, "supportsOrderBy": false, "supportsDistinct": false, "supportsCountDistinct": false, "supportsAdvancedQueryRelated": true, "supportsQueryRelatedPagination": true, "supportsPagination": false, "supportsLod": false, "supportsQueryWithLodSR": false, "supportsTrueCurve": true, "supportsQueryWithDatumTransformation": true, "supportsReturningQueryExtent": true, "supportsQueryWithDistance": true, "supportsSqlExpression": false, "supportsTimeRelation": true, "supportsSqlFormat": false, "supportsQueryAnalytic": false, "supportsCurrentUserQueries": true }, "supportsDatumTransformation": true, "dateFieldsTimeReference": null, "preferredTimeReference": null, "datesInUnknownTimezone": false, "hasMetadata": true, "isDataArchived": false, "archivingInfo": { "supportsQueryWithHistoricMoment": false, "startArchivingMoment": -1 }, "supportsCoordinatesQuantization": true, "supportsDynamicLegends": true }, { "currentVersion": 11.5, "cimVersion": "3.5.0", "id": 4, "name": "100 Year Coastal Flood Depth", "type": "Raster Layer", "description": "While the Waimakariri District Council has taken all reasonable care in providing correct information, all information should be considered as being illustrative and indicative only. Your use of this information is entirely at your own risk. You should independently verify the accuracy of any information before taking any action in reliance upon it. This flood information is based on modelling outputs and the accuracy of this data is limited by the assumptions used in the model. The WDC reserves the right to update this information and cannot guarantee that the information is accurate and up to date at all times. An experienced practitioner should be consulted if this information is to be used for Building or Development purposes. A site specific study may be required in some instances. Please refer to the District Plan and the Council\u2019s Planning Unit if you wish to use this information for planning purposes. Anyone who acts on any of this information does so at their own risk.Read full disclaimer here.Abstract:The purpose of this investigation was to model the flood effects across the District for the 100, 200 and 500 ARI (Annual Recurrence Interval) rain events. The maximum flood depths and corresponding maximum velocities would be used to generate a map of flood hazards. The flood hazard maps would be used in Council planning documents and form a layer on the Council GIS to be used in Council LIMs.Full Catchment Models have been produced that model the full district north and south of the Ashley River. Only the Lees Valley catchment upstream of Ashley Gorge has not been included due to insufficient ground data being available. Update Frequency:As RequiredPoint of Contact:Waimakariri District CouncilLineage:Flood modelling has been completed for all areas of the Waimakariri District with the exception of Lees Valley and flood exclusion zones (the flood exclusion zones are areas where the modelling has not been undertaken as these areas have recently had their land levels altered). Efforts have been made to update the Flood Modelling for new and proposed development areas, however the modelling may not be accurate in all areas where development has occurred since 2014.", "geometryType": null, "copyrightText": "DHI, WDC, & ECAN", "parentLayer": null, "subLayers": [], "minScale": 0, "maxScale": 0, "defaultVisibility": true, "extent": { "xmin": 1569421.5244, "ymin": 5193731.567729, "xmax": 1579366.5244, "ymax": 5213946.567729, "spatialReference": { "wkid": 2193, "latestWkid": 2193, "xyTolerance": 0.001, "zTolerance": 0.001, "mTolerance": 0.001, "falseX": -4020900, "falseY": 1900, "xyUnits": 10000, "falseZ": -100000, "zUnits": 10000, "falseM": -100000, "mUnits": 10000 } }, "hasAttachments": false, "htmlPopupType": "esriServerHTMLPopupTypeNone", "displayField": "", "typeIdField": null, "subtypeFieldName": null, "subtypeField": null, "defaultSubtypeCode": null, "fields": null, "geometryField": {}, "indexes": [], "subtypes": [], "relationships": [], "canModifyLayer": false, "canScaleSymbols": false, "hasLabels": false, "capabilities": "Query,Map", "supportsStatistics": false, "supportsExceedsLimitStatistics": false, "supportsAdvancedQueries": false, "supportedQueryFormats": "JSON, geoJSON, PBF", "isDataVersioned": false, "ownershipBasedAccessControlForFeatures": {"allowOthersToQuery": true}, "useStandardizedQueries": true, "advancedQueryCapabilities": { "useStandardizedQueries": true, "supportsStatistics": false, "supportsPercentileStatistics": false, "supportsHavingClause": false, "supportsOrderBy": false, "supportsDistinct": false, "supportsCountDistinct": false, "supportsAdvancedQueryRelated": true, "supportsQueryRelatedPagination": true, "supportsPagination": false, "supportsLod": false, "supportsQueryWithLodSR": false, "supportsTrueCurve": true, "supportsQueryWithDatumTransformation": true, "supportsReturningQueryExtent": true, "supportsQueryWithDistance": true, "supportsSqlExpression": false, "supportsTimeRelation": true, "supportsSqlFormat": false, "supportsQueryAnalytic": false, "supportsCurrentUserQueries": true }, "supportsDatumTransformation": true, "dateFieldsTimeReference": null, "preferredTimeReference": null, "datesInUnknownTimezone": false, "hasMetadata": true, "isDataArchived": false, "archivingInfo": { "supportsQueryWithHistoricMoment": false, "startArchivingMoment": -1 }, "supportsCoordinatesQuantization": true, "supportsDynamicLegends": true } ], "tables": [] }