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.本数据集涵盖以下地表洪水概率等级： - 高概率：对应10年一遇重现期事件 - 中概率：对应200年一遇重现期事件 - 低概率：对应2080年代采用英国气候预测2009（UKCP09）高排放情景模拟的气候变化影响下的200年一遇重现期事件 地表洪水灾害地图将展示（若有可用数据）以下信息： - 洪水淹没范围 - 洪水水深 - 适宜场景下的洪水流速 本次所用的气候变化情景，基于英国气候预测2009（UKCP09）针对2080年高排放情景的95%分位数预测值确定。 中、低概率洪水事件的选取标准与《苏格兰规划政策》中采用的重现期规范保持一致，而高概率事件的选取则贴合过去数十年间实际观测到的洪水事件特征。