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.本次可获取的地表积水洪涝（surface water flooding）灾害概率等级如下： - 高概率：10年一遇重现期 - 中概率：200年一遇重现期 - 低概率：2080年代采用英国气候预测2009（UKCP09）高排放情景叠加气候变化影响的200年一遇重现期事件 该地表洪涝灾害风险地图（若可获取）包含以下内容： - 洪涝淹没范围 - 洪涝水深 - 适用场景下的洪涝流速 本次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。中、低概率洪涝事件的选取标准与苏格兰规划政策（Scottish Planning Policy）中采用的重现期要求保持一致，而高概率事件的选取则贴合近数十年来实际观测到的洪涝灾害事件特征。