Surface Water Flood Maps (FRM_FH_SURFACE_WATER_EXTENT_M)

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.针对地表积水洪涝，本数据集提供如下概率分级： - 高概率：10年一遇重现期 - 中概率：200年一遇重现期 - 低概率：基于英国气候预测2009（UKCP09）2080年代高排放情景，叠加气候变化影响的200年一遇事件。 本数据集的地表积水洪涝风险地图将展示（如可获取）以下内容： - 洪水淹没范围 - 洪水水深 - 适宜场景下的洪水流速 本次气候变化情景由英国气候预测2009（UKCP09）针对2080年高排放情景的95%分位数预测结果定义。本研究选取中、低概率洪涝事件，以契合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参考了近数十年间实际观测到的洪涝灾情。