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.本批地图的制作旨在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》所规定的洪水风险地图发布义务。此类地图展示了海洋、河流及地表水引发的洪水风险分布区域。针对河流洪水，本次提供以下概率等级的风险数据：高概率（10年一遇）、中概率（200年一遇）、低概率（1000年一遇，以及2080年代采用英国2009年气候预测（UKCP09）高排放情景的200年一遇洪水叠加气候变化影响的情景）。河流洪水风险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，以及适宜场景下的洪水流速。本次气候变化情景基于英国2009年气候预测（UKCP09）针对2080年高排放情景下95%置信区间的预测结果确定。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、建模方法及影响效果。目前流速被划分为四个等级之一。为与苏格兰规划政策中采用的重现期标准保持一致，本次选取了中、低概率洪水情景；而高概率洪水情景的选取，则反映了过去数十年间实际观测到的洪水事件特征。