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（Scottish Environment Protection Agency, SEPA）依据《2009年洪水风险管理（苏格兰）法案》规定的发布义务而编制。本批地图展示了海洋、河流及地表水引发洪水的风险区域。 针对河流洪水，本次提供以下概率等级的情景： - 高概率：10年一遇重现期 - 中概率：200年一遇重现期 - 低概率：包含1000年一遇重现期情景，以及采用英国2009年气候预估（United Kingdom Climate Projection 2009, UKCP09）2080年代高排放情景的200年一遇叠加气候变化影响的情景。 河流危险性地图（如有提供）将展示以下内容： - 洪水淹没范围 - 洪水水深 - 适用情况下的洪水流速 本次采用的气候变化情景基于UKCP09针对2080年高排放情景的95%分位数预测结果确定。流速信息仅在适用情况下予以展示，其判定需综合考量输入数据、建模方法及影响的置信度，当前分为四个等级。 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反映了过去数十年间已观测到的实际洪水事件特征。