River Flood Maps (FRM_FH_RIVER_EXTENT_L)

These maps have been produced to meet SEPA’s duty to publish flood hazard maps as set out in the Flood Risk Management (Scotland) Act 2009. The maps show where there is a risk of flooding from the sea, from rivers and from surface water.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.本数据集收录的地图均为履行苏格兰环境保护局（SEPA）依据2009年《洪水风险管理（苏格兰）法案》所规定的洪水风险地图法定发布义务而制作。这些地图展示了海洋、河流及地表水引发的洪水风险分布区域。针对河流洪水，本次数据集提供以下概率等级的风险数据： - 高概率：10年一遇重现期 - 中概率：200年一遇重现期 - 低概率：1000年一遇重现期，以及结合2080年代英国气候预测2009（UKCP09）高排放情景的200年一遇洪水叠加气候变化影响的场景。 河流洪水风险地图将在可获取的情况下展示以下信息：洪水淹没范围、洪水水深，以及适宜场景下的洪水流速。本次采用的气候变化情景基于英国气候预测2009（UKCP09）针对2080年高排放情景的95百分位预测结果。中、低概率洪水情景的选取与《苏格兰规划政策》中采用的重现期标准保持一致，而高概率情景的选取则贴合近数十年来已观测到的实际洪水事件特征。