Surface Water Flood Maps (FRM_FH_SURFACE_WATER_DEPTH_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.本次数据集涵盖地表洪水（surface water flooding）的概率分级体系，具体如下： - 高概率等级：对应10年一遇重现期（return period） - 中概率等级：对应200年一遇重现期 - 低概率等级：对应200年一遇重现期叠加气候变化情景，采用英国气候预测2009（UKCP09）高排放情景下2080年代的预测数据。 地表洪水灾害风险图（surface water hazard maps）可展示以下参数（若可获取）： - 洪水淹没范围（Flood extent） - 洪水水深（Flood depth） - 适宜场景下的洪水流速（Flood velocities） 该气候变化情景基于英国气候预测2009（UKCP09）针对2080年高排放情景的95%分位数预测结果设定。本次选取中、低概率洪水事件，以匹配苏格兰规划政策（Scottish Planning Policy）中采用的重现期标准；高概率洪水事件的选取则参考了过去数十年间观测到的实际洪水事件，以反映真实的洪水发生特征。