Surface Water Flood Maps (FRM_FH_SURFACE_WATER_EXTENT_H)

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.本次数据集包含以下地表洪水概率等级： - 高概率：重现期10年一遇 - 中概率：重现期200年一遇 - 低概率：基于2080年代英国气候预估2009（UKCP09）高排放情景叠加气候变化影响的200年一遇洪水 地表洪水灾害图（若有对应数据则包含以下内容）： - 洪水淹没范围 - 洪水水深 - 适宜场景下的洪水流速 本次所用气候变化情景，基于英国2009年气候预估（UKCP09）针对2080年高排放情景的95%分位数预测结果。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；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水事件特征。