Surface Water Flood Maps (FRM_FH_SURFACE_WATER_DEPTH_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的各类概率等级及对应情景： - 高概率：10年一遇重现期 - 中概率：200年一遇重现期 - 低概率：叠加气候变化影响的200年一遇情景，采用英国气候预测2009（United Kingdom Climate Projection 2009，UKCP09）的2080年代高排放情景。 地表积水灾害地图包含以下内容（如可获取）： - 洪水淹没范围 - 洪水水深 - 适宜场景下的洪水流速 本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%分位数预测结果确定。本次选取中、低概率洪水事件，以匹配《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基于近数十年来已观测到的实际洪水事件特征。