Surface Water Flood Maps (FRM_FH_SURFACE_WATER_EXTENT_M)

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.本次可获取的地表积水（surface water flooding）灾害概率等级如下： - 高概率：重现期为10年一遇 - 中概率：重现期为200年一遇 - 低概率：基于2080年代英国气候预测2009（United Kingdom Climate Projection 2009, UKCP09）高排放情景叠加气候变化影响的200年一遇事件。 地表积水灾害风险图（如可获取）将展示以下内容：淹没范围、淹没水深，以及适宜场景下的洪水流速。 本次设定的气候变化情景，依据英国气候预测2009（UKCP09）针对2080年高排放情景下的95%分位数预测结果确定。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保持一致；而高概率事件的选取，则参考了过去数十年间实际观测到的洪水灾情。