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.本数据集针对地表洪水（surface water flooding）提供以下概率分级方案： - 高概率：10年一遇重现期 - 中概率：200年一遇重现期 - 低概率：叠加2080年代英国气候预测2009（UKCP09）高排放情景下气候变化影响的200年一遇重现期 地表洪水灾害风险图（surface water hazard maps）可展示以下内容（如可获取）： - 洪水淹没范围 - 洪水水深 - 适宜场景下的洪水流速 该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。 中、低概率洪涝事件的重现期选取与苏格兰规划政策中采用的重现期标准保持一致，而高概率事件的选取则契合了近数十年来观测到的实际灾害事件特征。