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.以下为地表积水洪水（surface water flooding）的概率分级及对应情景： - 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：对应叠加气候变化影响的200年一遇情景，采用英国气候预估2009（UKCP09）高排放情景下2080年代的预测数据。 地表积水灾害地图（若可获取）将展示以下内容： - 洪水淹没范围 - 洪水水深 - 适宜场景下的洪水流速 该气候变化情景由英国气候预估2009（UKCP09）针对2080年高排放情景的95%分位预测值定义。本次选取中、低概率洪水事件，以契合苏格兰规划政策中采用的重现期标准；而高概率洪水事件的选取则反映了近数十年来实际观测到的洪涝事件特征。