Surface Water Flood Maps (FRM_FH_SURFACE_WATER_VELOCITY_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. Velocity is presented, where appropriate; this is determined by considering the confidence in input data, modelling method and impact. It is currently represented as one of four bandsThe 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.本次公开的地表积水淹没概率等级如下： - 高概率：重现期10年一遇 - 中概率：重现期200年一遇 - 低概率：叠加2080年代英国气候预测2009（UKCP09）高排放情景下气候变化影响的200年一遇洪水事件 地表积水灾害地图（如有提供）包含以下内容： - 淹没范围 - 淹没水深 - 适宜场景下的淹没流速。流速的展示需结合输入数据可信度、建模方法与影响效果综合判定，当前将流速划分为四个等级进行呈现。 本数据集采用的气候变化情景基于英国气候预测2009（UKCP09）针对2080年高排放情景下的95%分位数预测结果设定。中、低概率洪水事件的选取与苏格兰规划政策中采用的重现期标准保持一致，而高概率洪水事件的选取则参考了近数十年来实际观测到的洪水事件特征。