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.本批地图系为履行苏格兰环境保护署（SEPA）依据《2009年洪水风险管理（苏格兰）法案》规定的发布洪水灾害地图的法定义务而制作。本类地图覆盖了海洋、河流与地表径流引发洪水的风险区域。针对河流洪水，本次发布以下概率分级的洪水场景： - 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年代英国气候预测2009（UKCP09）高排放情景的气候变化修正版200年一遇场景。河流洪水灾害地图将在数据可用时展示以下内容： - 洪水淹没范围 - 洪水水深 - 适用场景下的洪水流速。本气候变化情景系基于英国气候预测2009（UKCP09）针对2080年高排放情景的95百分位预测结果设定。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、建模方法与影响评估结果。目前流速被划分为四个等级之一。本次选取中、低概率洪水场景，旨在与苏格兰规划政策中采用的重现期标准保持一致；而高概率场景的选取，则因其能够反映近数十年来实际观测到的洪水事件特征。