Surface Water Flood Maps (FRM_FH_SURFACE_WATER_DEPTH_H)

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.本次数据集涵盖的地表洪水（surface water flooding）概率等级如下： - 高概率：重现期10年 - 中概率：重现期200年 - 低概率：2080年代采用英国2009年气候预测（UKCP09）高排放情景，200年一遇情景叠加气候变化影响 地表洪水风险图（surface water hazard maps）涵盖以下内容（如可获取）： - 淹没范围 - 淹没水深 - 适用场景下的洪水流速 本数据集所用气候变化情景，基于英国2009年气候预测（UKCP09）针对2080年高排放情景的95%分位数预测结果设定。中、低概率洪水事件的选取参考了苏格兰规划政策中采用的重现期标准，而高概率事件的选取则贴合近数十年来观测到的实际洪涝灾情。