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.本套洪水风险地图系为履行苏格兰环境保护局（Scottish Environment Protection Agency, SEPA）依据《2009年洪水风险管理（苏格兰）法案》（Flood Risk Management (Scotland) Act 2009）规定的法定发布职责而编制。本套地图展示了海洋、河流及地表积水引发的洪水风险分布区域。 针对河流洪水，现有三类概率等级的洪水情景： - 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年一遇重现期情景，以及2080年代采用英国2009年气候预测（UKCP09）高排放情景的200年一遇洪水叠加气候变化影响的情景 河流洪水风险地图（如可获取）将展示以下内容： - 洪水淹没范围 - 洪水水深 - 适用于对应场景的洪水流速 本次编制采用的气候变化情景，基于英国2009年气候预测（UKCP09）针对2080年高排放场景的95%分位数预测结果设定。 中、低概率洪水情景的选取契合《苏格兰规划政策》中采用的重现期标准，而高概率情景的选取则反映了近数十年间已观测到的洪水事件特征。