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.本次制作的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》所规定的发布洪水危险地图的法定职责而完成。该批地图展示了受海洋、河流及地表水引发洪水风险的区域范围。 针对河流洪水，提供以下三类概率等级的风险场景： - 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，以及基于2080年代英国高排放情景的英国2009年气候预估（UK Climate Projections 2009, UKCP09）结果，叠加气候变化影响的200年一遇重现期洪水场景。 河流洪水危险地图（如可获取）将展示以下内容： - 洪水淹没范围 - 洪水水深 - 适宜场景下的洪水流速。 该气候变化场景系基于英国2009年气候预估（UKCP09）针对2080年代高排放情景下的95%分位数预估结果设定。流速信息仅在适宜场景下予以展示，其判定依据为输入数据可信度、建模方法及影响评估结果，当前流速被划分为四个等级进行展示。 中、低概率洪水场景的选取系为与苏格兰规划政策中采用的重现期标准保持一致，而高概率场景的选取则因其能够反映近数十年间已观测到的实际洪水事件特征。