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.本次数据集提供以下地表洪水概率等级： - 高概率：对应10年一遇重现期 - 中概率：对应200年一遇重现期 - 低概率：结合2080年代英国气候预测2009（UKCP09）高排放情景下的气候变化影响的200年一遇洪水 地表洪水灾害风险图（可提供时）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，基于英国气候预测2009（UKCP09）针对2080年代高排放情景的95%分位数预测结果确定。本次选取中、低概率洪水事件，是为了与苏格兰规划政策中采用的重现期标准保持一致；而高概率洪水事件的选取，则是为了匹配近数十年间实际观测到的洪水事件特征。