Floodplain Base Flood Elevations

Location and attributes for Base Flood Elevations lines shown on FIRM. The elevation of surface water resulting from a flood that has a 1% chance of equaling or...本数据集涵盖洪水保险费率图（Flood Insurance Rate Map，FIRM）中所标注的基准洪水水位（Base Flood Elevations）线的位置与属性信息。该数据指的是由一场发生概率为1%及以上（原文表述未完整）的洪水所形成的地表水体高程。