Parent Layer: --Flood Construction Levels--

Name: Coastal Floodplain Setback Line

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Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P STYLE="margin:0 0 11 0;"><SPAN><SPAN>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><P STYLE="margin:0 0 11 0;"><SPAN><SPAN>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><SPAN><SPAN>50% </SPAN></SPAN><SPAN><SPAN>= R</SPAN></SPAN><SPAN><SPAN>2%</SPAN></SPAN><SPAN><SPAN>/2.2) for the 0.5% AEP storm event (Ausenco Sandwell, 2011).</SPAN></SPAN></P><P STYLE="margin:0 0 11 0;"><SPAN><SPAN>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><UL><LI><P><SPAN><SPAN>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><UL><LI><P><SPAN><SPAN>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>

Copyright Text: Kerr Wood Leidal Associates Ltd.

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Label: Coastal Floodplain Setback Line
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