Description: The project was undertaken by the Western Cape Province, Department of Environmental Affairs and Development Planning during 2016-2018. The Coastal Management Line (CML) is delineated using a decision-tree that combines sensitive or at-risk coastal features to designate a strip along the High-water Mark that should not be developed due to risks to human life, property or infrastructure, in alignment with the prescriptions of the National Environmental Management: Integrated Coastal Management Act (Act No. 24 of 2008). The CML is drawn:Landward of:sensitive coastal vegetation (see Note 1)public open spacesteep coastal cliffs (as identified by slope elements steeper than 25% (1:4 slope)) (See Note 2)large wetland areaslittoral active zonesocial, economic and heritage featureslong-term (1:100yr) erosion risk projections in rural areas (See Note 3)medium-term (1:50 yr) erosion risk projections in built-up areas (See Note 3)government infrastructure and amenities, unless a clear property boundary of development footprint is presentSeaward ofports or harboursAlong the 1:100yr floodline or 5m amsl contour for estuaries, whichever is widerOnly where the combination of factors create a congruent polygon that extends far inland, beyond where 'coastal' concerns are dominant, is there deviation from this method. In such cases, a straight line is drawn accross the top of the deemed coastal feature to exclude 'terrestrial' concerns.Note 1: Sensitive coastal vegetation is identified as intact coastal vegetation units where these are identified as Critical Biodiversity Areas (CBA) and Ecological Support Areas (ESA) (i.e. Protected Areas, CBA1, CBA2 and ESA1) in the 2017 Western Cape Biodiversity Spatial Plan (CapeNature, 2017). Coastal vegetation units were identified by using the fine scale vegetation maps by Vlok (2014) and Harris (2015) and include: Vlok - Drift Sands, Littoral Vegetation, Primary Dune (Marine Biome), Estuary, Riverine Saltmarsh, Coastal Solid, Coastal Riverine, Coastal Dune Milkwood & Ekebergia; Harris - Estuary floodplain, Foredune, Intertidal & Sediment.Note 2: Steep coastal cliffs were identified in the GIS environment:Create TIN from a 5m contour map derived from Lidar data provided by the Western Cape Province, Department of Environmental Affairs and Development PlanningRun Slope function based on 1:4 slope classification (2 classes – steep/not)Convert polygon to line Simplify the line with a 25m ‘buffer-unbuffer’ workaround Manually idenitfy a continous line on primary dunes and along valleys along the shore and disregard all elseNote 3: Risk projections are based on modelling and delineation of short (1:20 year storm event and a 20cm prediction of sea level rise), medium (1:50 year storm event and a 50cm prediction of sea level rise) and long (1:100-year storm event and a 100cm prediction of sea level rise) term risk. The full methodology is explained in a report available from the Department of Environmental Affairs and Development Planning.
Service Item Id: 4e1b5c603268465084e95d8c686338dc
Copyright Text: Created by Royal HaskoningDHV
Project Information owned by the Western Cape Province, Department of Environmental Affairs and Development Planning:
Ms Ieptieshaam Bekko
Sub-Directorate: Coastal Management Directorate: Biodiversity and Coastal Management
Chief Directorate: Environmental Sustainability
4th Floor, Leeusig Building, 1 Dorp Street, Cape Town
Tel: 021 483 3370
E-mail: Ieptieshaam.Bekko@westerncape.gov.za
Description: The project was undertaken by the Western Cape Province, Department of Environmental Affairs and Development Planning during 2016-2018. The Coastal Management Line (CML) is delineated using a decision-tree that combines sensitive or at-risk coastal features to designate a strip along the High-water Mark that should not be developed due to risks to human life, property or infrastructure, in alignment with the prescriptions of the National Environmental Management: Integrated Coastal Management Act (Act No. 24 of 2008). The CML is drawn:Landward of:sensitive coastal vegetation (see Note 1)public open spacesteep coastal cliffs (as identified by slope elements steeper than 25% (1:4 slope)) (See Note 2)large wetland areaslittoral active zonesocial, economic and heritage featureslong-term (1:100yr) erosion risk projections in rural areas (See Note 3)medium-term (1:50 yr) erosion risk projections in built-up areas (See Note 3)government infrastructure and amenities, unless a clear property boundary of development footprint is presentSeaward of ports or harboursAlong the 1:100yr floodline or 5m amsl contour for estuaries, whichever is widerOnly where the combination of factors create a congruent polygon that extends far inland, beyond where 'coastal' concerns are dominant, is there deviation from this method. In such cases, a straight line is drawn accross the top of the deemed coastal feature to exclude 'terrestrial' concerns.Note 1: Sensitive coastal vegetation is identified as intact coastal vegetation units where these are identified as Critical Biodiversity Areas (CBA) and Ecological Support Areas (ESA) (i.e. Protected Areas, CBA1, CBA2 and ESA1) in the 2017 Western Cape Biodiversity Spatial Plan (CapeNature, 2017). Coastal vegetation units were identified by using the fine scale vegetation maps by Vlok (2014) and Harris (2015) and include: Vlok - Drift Sands, Littoral Vegetation, Primary Dune (Marine Biome), Estuary, Riverine Saltmarsh, Coastal Solid, Coastal Riverine, Coastal Dune Milkwood & Ekebergia; Harris - Estuary floodplain, Foredune, Intertidal & Sediment.Note 2: Steep coastal cliffs were identified in the GIS environment:Create TIN from a 5m contour map derived from Lidar data provided by the Western Cape Province, Department of Environmental Affairs and Development PlanningRun Slope function based on 1:4 slope classification (2 classes – steep/not)Convert polygon to line Simplify the line with a 25m ‘buffer-unbuffer’ workaround Manually idenitfy a continous line on primary dunes and along valleys along the shore and disregard all elseNote 3: Risk projections are based on modelling and delineation of short (1:20 year storm event and a 20cm prediction of sea level rise), medium (1:50 year storm event and a 50cm prediction of sea level rise) and long (1:100-year storm event and a 100cm prediction of sea level rise) term risk. The full methodology is explained in a report available from the Department of Environmental Affairs and Development Planning.
Service Item Id: 4e1b5c603268465084e95d8c686338dc
Copyright Text: Created by Royal HaskoningDHV
Project Information owned by the Western Cape Province, Department of Environmental Affairs and Development Planning:
Ms Ieptieshaam Bekko
Sub-Directorate: Coastal Management Directorate: Biodiversity and Coastal Management
Chief Directorate: Environmental Sustainability
4th Floor, Leeusig Building, 1 Dorp Street, Cape Town
Tel: 021 483 3370
E-mail: Ieptieshaam.Bekko@westerncape.gov.za
Description: The project was undertaken by the Western Cape Province, Department of Environmental Affairs and Development Planning during 2016-2018. The Coastal Protection Zone (CPZ) is delineated using a decision-tree that coastal features to designate a zone along the High-water Mark where coastal considerations should be recognised, in alignment with the prescriptions of the National Environmental Management: Integrated Coastal Management Act (Act No. 24 of 2008). The CPZ combines:protected areaspublic property running parallel to the coastundeveloped areas surrounding harboursany areas or features of biopysical, social, economic or heritage value linked to the coast and not included in the CMLminimum width of 100m from the HWM in built-up areasminimum width of 1km from the HWM in rural areas10m amsl contour or 1:100yr floodline (whichever is wider) around estuaries
Service Item Id: 4e1b5c603268465084e95d8c686338dc
Copyright Text: Created by Royal HaskoningDHV
Project Information owned by the Western Cape Province, Department of Environmental Affairs and Development Planning:
Ms Ieptieshaam Bekko
Sub-Directorate: Coastal Management Directorate: Biodiversity and Coastal Management
Chief Directorate: Environmental Sustainability
4th Floor, Leeusig Building, 1 Dorp Street, Cape Town
Tel: 021 483 3370
E-mail: Ieptieshaam.Bekko@westerncape.gov.za
Description: Development islands along the coast in Garden Route District, Western Cape Province, South Africa.
Service Item Id: 4e1b5c603268465084e95d8c686338dc
Copyright Text: Created by Royal HaskoningDHV
Project Information owned by the Western Cape Province, Department of Environmental Affairs and Development Planning:
Ms Ieptieshaam Bekko
Sub-Directorate: Coastal Management Directorate: Biodiversity and Coastal Management
Chief Directorate: Environmental Sustainability
4th Floor, Leeusig Building, 1 Dorp Street, Cape Town
Tel: 021 483 3370
E-mail: Ieptieshaam.Bekko@westerncape.gov.za
Description: The 100m HWM buffer is created by the buffer function in ArcGis, set at 100m. Baseline reference is the HWM delineated as part of a larger project delineating such lines for the Garden Route District, Western, Cape Province, South Africa. The project was undertaken by the Western Cape Province Department of Environmental Affairs and Development Planning during 2016-2018. The HWM is based on a line indicating a 1:10yr wave run-up generated with a wave run-up simulation model, with corrections were applied manually after visual inspection, and is available as a separate dataset.
Service Item Id: 4e1b5c603268465084e95d8c686338dc
Copyright Text: Created by Royal HaskoningDHV
Project Information owned by the Western Cape Province, Department of Environmental Affairs and Development Planning:
Ms Ieptieshaam Bekko
Sub-Directorate: Coastal Management Directorate: Biodiversity and Coastal Management
Chief Directorate: Environmental Sustainability
4th Floor, Leeusig Building, 1 Dorp Street, Cape Town
Tel: 021 483 3370
E-mail: Ieptieshaam.Bekko@westerncape.gov.za
Description: The 1km HWM buffer is created by the buffer function in ArcGis, set at 1km. Baseline reference is the HWM delineated as part of a larger project delineating such lines for the Garden Route District, Western, Cape Province, South Africa. The project was undertaken by the Western Cape Province Department of Environmental Affairs and Development Planning during 2016-2018. The HWM is based on a line indicating a 1:10yr wave run-up generated with a wave run-up simulation model, with corrections were applied manually after visual inspection, and is available as a separate dataset.
Service Item Id: 4e1b5c603268465084e95d8c686338dc
Copyright Text: Created by Royal HaskoningDHV
Project Information owned by the Western Cape Province, Department of Environmental Affairs and Development Planning:
Ms Ieptieshaam Bekko
Sub-Directorate: Coastal Management Directorate: Biodiversity and Coastal Management
Chief Directorate: Environmental Sustainability
4th Floor, Leeusig Building, 1 Dorp Street, Cape Town
Tel: 021 483 3370
E-mail: Ieptieshaam.Bekko@westerncape.gov.za