Probable Maximum Flood Depths with Recent Development Area

The Probable Maximum Flood depth map represents depths from a flooding and storm tide event with the greatest depth of rainfall meteorologically possible. The flood depth map may not provide an accurate guide of the flood hazard at a given location, due to the absence of velocity information. Flood hazard, which incorporates both depth and velocity characteristics, can be viewed in the Probable Maximum Flood Hazard map. Ground levels used to inform the mapping include: - 2014 LiDAR as the base terrain; - 2022 LiDAR covering urban areas; and - 2022 LiDAR covering earthworks which occurred between 2014 and 2022 outside of urban areas. Recent Development Areas highlight locations where flood information is likely to have changed due to development that has occurred since the underlying mapping was prepared. Recent Development Areas are represented by a -99 value in this layer.可能最大洪水（Probable Maximum Flood）水深图，展示了气象学范畴内可能出现的最大降雨强度所引发的洪水与风暴潮事件的水深分布。由于未包含流速信息，该洪水水深图无法准确反映特定点位的洪水灾害风险。兼具水深与流速双重特征的洪水灾害风险，可通过可能最大洪水灾害风险图进行查阅。 用于支撑该图制作的地面高程数据包括： - 以2014年激光雷达（LiDAR）数据作为基础地形数据源； - 覆盖城市区域的2022年激光雷达（LiDAR）数据； - 覆盖2014至2022年间非城市区域土方工程的2022年激光雷达（LiDAR）数据。 近期开发区（Recent Development Areas）指代自基础图件编制完成后，因后续开发建设活动导致洪水信息发生变更的区域，该图层中以-99值表征此类区域。