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.本次公开的地表洪涝（surface water flooding）概率分级如下： - 高概率：10年一遇重现期（return period） - 中概率：200年一遇重现期 - 低概率：采用英国气候预测2009（UKCP09）2080年代高排放情景，叠加气候变化影响的200年一遇重现期 本次地表洪涝风险地图（surface water hazard maps）如可获取则包含以下内容： - 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年代高排放情景的95%分位数预测结果定义。 本次选取中、低概率洪涝事件，旨在与苏格兰规划政策中采用的重现期标准保持一致；而高概率洪涝事件的选取，则是为了反映近数十年来实际观测到的洪涝事件特征。