Surface Water Flood Maps (FRM_FH_SURFACE_WATER_EXTENT_L)

The following probabilities are available for surface water flooding: - High - 10 year return period - Medium - 200 year return period - Low - 200 year return period plus climate change using the UKCP09 high emissions scenario for the 2080s.The surface water hazard maps show (where available): - Flood extent - Flood depth - Flood velocities where appropriate. The climate change scenario has been defined by United Kingdom Climate Projection 2009 (UKCP09) predictions for 2080 high emissions 95%ile predictions. Medium and low probability flood events were selected for consistency with return periods used in Scottish Planning Policy, whereas the high probability was chosen as it is reflective of observed events experienced over the last few decades.本次公开的地表积水（surface water flooding）概率分级如下： - 高概率：重现期（return period）10年一遇 - 中概率：重现期200年一遇 - 低概率：基于英国2009年气候预测（UKCP09）高排放情景下2080年代的气候变化修正后的200年一遇事件 地表积水灾害风险图可展示以下内容（如可获取）： - 淹没范围 - 淹没水深 - 适宜场景下的淹没流速 本研究所采用的气候变化情景，由英国2009年气候预测（UKCP09）中2080年高排放情景下95%分位数预测结果确定。 中、低概率洪水事件的选取与苏格兰规划政策（Scottish Planning Policy）中采用的重现期标准保持一致；高概率事件则选取近数十年间实际观测到的典型洪水事件作为参照依据。