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.本批地图系为履行苏格兰环境保护局（Scottish Environment Protection Agency，简称SEPA）依据《2009年（苏格兰）洪水风险管理法》（Flood Risk Management (Scotland) Act 2009）所规定的发布洪水危险地图（flood hazard maps）的义务而编制。本类地图展示了海岸、河流以及地表积水引发的洪水风险区域。 针对河流洪水，共设有如下概率等级： - 高概率：10年一遇重现期 - 中概率：200年一遇重现期 - 低概率：包含1000年一遇重现期，以及基于2080年代英国气候预测2009（United Kingdom Climate Projection 2009，简称UKCP09）高排放情景、叠加气候变化影响的200年一遇重现期洪水事件。 河流危险地图（river hazard maps，如可获取）将展示以下内容： - 洪水淹没范围 - 洪水水深 - 适用场景下的洪水流速。 本气候变化情景由英国气候预测2009（United Kingdom Climate Projection 2009，简称UKCP09）针对2080年代高排放情景的95%分位数预测结果定义。中、低概率洪水事件的选取标准与苏格兰规划政策中采用的重现期要求保持一致，而高概率洪水事件的选取则贴合近数十年来实际观测到的洪水事件特征。