River Flood Maps (FRM_FH_RIVER_VELOCITY_DIRECTION_M)

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. Velocity is presented, where appropriate; this is determined by considering the confidence in input data, modelling method and impact. It is currently represented as one of four bandsMedium 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.本套洪涝风险地图的编制，旨在履行苏格兰环境保护局（SEPA）依据《2009年苏格兰洪涝风险管理法》所规定的发布洪涝风险地图的法定职责。本套地图展示了受海洋、河流及地表水引发的洪涝灾害风险的区域。针对河流洪涝，现有以下概率分级的情景： - 高概率：10年一遇重现期 - 中概率：200年一遇重现期 - 低概率：1000年一遇重现期，以及采用英国气候预测2009（UKCP09）2080年代高排放情景的200年一遇重现期叠加气候变化影响的情景。 河流洪涝风险地图（如可获取）将展示以下内容： - 洪涝淹没范围 - 洪涝水深 - 适宜场景下的洪涝流速 该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95百分位预测结果确定。流速信息仅在适宜情况下予以展示，其判定依据为输入数据可信度、建模方法及影响效应。目前流速被划分为四个等级之一。中、低概率洪涝事件的选取旨在与《苏格兰规划政策》中采用的重现期标准保持一致，而高概率事件的选取则贴合近数十年来观测到的实际洪涝灾情。