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.本数据集提供以下地表洪水（surface water flooding）的概率分级及对应情景： - 高概率：对应10年一遇重现期（return period） - 中概率：对应200年一遇重现期（return period） - 低概率：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。 地表洪水灾害地图（surface water hazard maps）将展示以下内容（若数据源可获取）：淹没范围（Flood extent）、淹没水深（Flood depth），以及适用场景下的洪水流速（Flood velocities）。 本次设定的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。 中、低概率洪水事件的选取标准与苏格兰规划政策（Scottish Planning Policy）中采用的重现期规范保持一致，而高概率事件的选取则旨在反映近数十年来实际观测到的洪水事件特征。