River Flood Maps (FRM_FH_RIVER_VELOCITY_M_CC)

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年苏格兰洪水风险管理法》规定的发布洪水危险性地图的法定义务而制作。本批地图展示了海洋、河流以及地表积水引发的洪水风险区域。针对河流洪水，共提供以下不同概率等级的危险性数据：- 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2080年代采用英国气候预测2009（UKCP09）高排放情景下，叠加气候变化影响的200年一遇重现期情景。河流危险性地图将在可获取数据的前提下，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。该气候变化情景基于英国气候预测2009（UKCP09）针对2080年高排放情景下的95百分位预测结果设定。流速数据仅在适宜场景下予以展示，其判定依据为输入数据、建模方法及影响评估的置信度水平，目前分为四个等级进行呈现。中、低概率洪水情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，而高概率情景的选取则贴合近数十年间实际观测到的洪水事件特征。