River Flood Maps (FRM_FH_RIVER_VELOCITY_DIRECTION_H)

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.本批洪水危险性地图系为履行苏格兰环境保护局（SEPA）的法定职责而制作，该职责要求其依据《2009年洪水风险管理（苏格兰）法案》发布相关地图。本批地图展示了受海洋、河流及地表径流引发的洪水风险区域。 河流洪水的概率分级如下： - 高概率：10年一遇重现期 - 中概率：200年一遇重现期 - 低概率：涵盖1000年一遇洪水，以及基于英国2009年气候预测（UKCP09）2080年代高排放情景的气候变化影响下的200年一遇洪水。 河流危险性地图将展示（如可获取）以下信息：洪水淹没范围、洪水水深，以及适用情况下的洪水流速。 本气候变化情景系基于英国2009年气候预测（UKCP09）针对2080年高排放情景的95百分位预测结果设定。 洪水流速信息仅在适用场景下提供，其判定依据为输入数据可信度、建模方法及影响评估结果。目前流速被划分为四个等级之一。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保持一致，而高概率洪水事件的选取则基于近数十年间实际观测到的洪水事件。