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.本次数据集涵盖以下地表洪水（surface water flooding）的发生概率分级： - 高概率等级：重现期为10年的洪水事件 - 中概率等级：重现期为200年的洪水事件 - 低概率等级：基于2080年代英国气候预测2009（UKCP09）高排放情景下的气候变化修正后的200年一遇洪水事件 地表洪水危险性地图（如可获取）将展示以下内容： - 洪水淹没范围 - 洪水水深 - 适用场景下的洪水流速 本数据集采用的气候变化情景，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。 本次选取中、低概率洪水事件，以匹配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来实际观测到的洪水事件特征。