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.针对地表洪水（surface water flooding）灾害，现有以下概率分级及对应情景： - 高概率：10年一遇重现期（return period） - 中概率：200年一遇重现期 - 低概率：基于英国2009年气候预测（UKCP09）2080年代高排放情景，叠加气候变化影响的200年一遇情景 本次公开的地表洪水危险性图件（若可获取）包含以下内容： - 洪水淹没范围 - 洪水水深 - 适情提供的洪水流速 本研究采用的气候变化情景，由英国2009年气候预测（UKCP09）针对2080年高排放情景的95百分位预测结果定义。 中、低概率洪水情景的选取与苏格兰规划政策中采用的重现期标准保持一致；而高概率情景的选取则反映了近数十年来已观测到的实际洪水事件特征。