Name: Coastal Management Line

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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

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