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.本批洪水危险性地图的制作，旨在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》所规定的洪水危险性地图发布义务。此类地图展示了海洋、河流以及地表径流引发的洪水风险区域。 针对河流洪水，提供以下不同概率等级的场景： - 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，以及叠加2080年代英国2009年气候预测（UKCP09）高排放情景下气候变化影响的200年一遇重现期场景。 河流危险性地图将展示（如可获取）以下内容： - 洪水淹没范围 - 洪水水深 - 适宜场景下的洪水流速。 本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95百分位预测结果制定。中、低概率洪水场景的选取参考了苏格兰规划政策中采用的重现期标准，以保证一致性；而高概率场景的选取则贴合近数十年间实际观测到的洪水事件特征。