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.本次公开的地表积水（surface water flooding）概率分级如下： - 高概率：对应10年一遇重现期 - 中等概率：对应200年一遇重现期 - 低概率：对应200年一遇重现期叠加2080年代英国气候投影2009（UKCP09）高排放情景下的气候变化影响后的事件。 地表洪水风险图（surface water hazard maps）将包含以下（如可获取的）内容： - 洪水淹没范围 - 洪水水深 - 适用场景下的洪水流速。 本次气候变化情景由英国气候投影2009（UKCP09）针对2080年高排放情景的95%分位数预测结果定义。中等与低概率洪水事件的选取与苏格兰规划政策（Scottish Planning Policy）中采用的重现期标准保持一致；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事件特征。