Surface Water Flood Maps (FRM_FH_SURFACE_WATER_EXTENT_M)

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.本次数据集涵盖以下地表洪水概率等级及对应情景： - 高概率：10年一遇重现期洪水 - 中概率：200年一遇重现期洪水 - 低概率：基于英国气候预测2009（UKCP09）2080年代高排放情景，叠加气候变化影响的200年一遇重现期洪水 地表洪水危险性地图（如可获取）包含以下要素： - 洪水淹没范围 - 洪水水深 - 适宜场景下的洪水流速 本数据集所采用的气候变化情景，由英国气候预测2009（UKCP09）针对2080年高排放场景的95百分位预测结果定义。本次选取中、低概率洪水情景，旨在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依据，则是其能够反映近数十年来实际观测到的洪水事件特征。