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.本次公开的地表洪水（surface water flooding）概率等级分为以下三类： - 高概率：对应10年一遇重现期的洪涝事件 - 中概率：对应200年一遇重现期的洪涝事件 - 低概率：对应2080年代采用英国气候预测2009（UKCP09）高排放情景下，200年一遇叠加气候变化影响的洪涝事件。 本次公开的地表洪水危险性地图（若有可用数据）包含以下内容： - 淹没范围 - 淹没水深 - 适宜场景下的洪水流速。 该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95百分位预测结果定义。 中、低概率的洪涝事件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近数十年间实际观测到的洪涝事件特征。