Surface Water Flood Maps (FRM_FH_SURFACE_WATER_EXTENT_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.针对地表洪水，本次提供以下概率等级场景： - 高概率：对应10年一遇重现期 - 中概率：对应200年一遇重现期 - 低概率：以200年一遇重现期为基础，叠加2080年代英国2009年气候预测（United Kingdom Climate Projection 2009，简称UKCP09）高排放情景下的气候变化影响 地表洪水危险性地图可展示以下内容（如可获取）： - 淹没范围 - 淹没水深 - 适宜场景下的洪水流速 本次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%分位数预测结果确定。 本次选取中、低概率洪水场景，是为与苏格兰规划政策中采用的重现期标准保持一致；而高概率场景的选取则因其能够反映近数十年来实际观测到的洪水事件特征。