River Flood Maps (FRM_FH_RIVER_EXTENT_H)

The following probabilities are available for river flooding: - High - 10 year return period - Medium - 200 year return period - Low - 1000 year return period and 200 year return period plus climate change using the UKCP09 high emissions scenario for the 2080s.The river 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.本次公开的河道洪水概率分级及对应参数如下： - 高概率等级：对应10年一遇重现期（return period） - 中概率等级：对应200年一遇重现期 - 低概率等级包含两类场景：其一为1000年一遇重现期的洪水；其二为结合2080年代英国2009年气候预估（United Kingdom Climate Projection 2009，UKCP09）高排放情景，将200年一遇洪水与气候变化影响叠加后的洪水场景。 河道灾害图（若可获取则包含以下要素）： - 淹没范围 - 淹没水深 - 适宜场景下的洪水流速 本研究采用的气候变化情景基于英国2009年气候预估（UKCP09）针对2080年代高排放情景的95%分位数预测结果设定。 中、低概率洪水事件的选取是为了与苏格兰规划政策中采用的重现期规范保持一致，而高概率洪水事件的选取则贴合近数十年间实际观测到的洪水事件特征。