Flood of August 2016 in Louisiana

Heavy rainfall occurred across Louisiana in August, 2016 as a result of a slow-moving area of low pressure and a high amount of atmospheric moisture. The storm caused major flooding in the southern portions of Louisiana including areas surrounding Baton Rouge and Lafayette. Flooding occurred along the rivers such as the Amite, Comite, Tangipahoa, Tickfaw, Vermilion, and Mermentau. Over 31 inches of rain were reported in Watson just northeast of Baton Rouge, LA over the duration of the event. Streamflow gaging stations operated by the U.S. Geological Survey recorded peak streamflows of record at 6 locations, and 16 locations experienced peak streamflows ranking in the top 5 for the duration of the period of record. In August, 2016, U.S. Geological Survey hydrographers made over ## discharge measurements at over ## locations on streams in Louisiana. Many of those discharge measurements were made for the purpose of verifying the accuracy of stage-streamflow relations at gaging stations operated by the U.S. Geological. Following the storm event, USGS hydrographers recovered and documented 590 high water marks in Louisiana. Many of these high water marks were used to create 12 flood-inundation maps for selected areas of Louisiana that experienced flooding in August 2016.

2016年8月，受缓慢移动的低压系统与充沛大气水汽共同作用，美国路易斯安那州全域遭遇强降雨过程。此次风暴引发路易斯安那州南部区域性严重洪涝，波及巴吞鲁日（Baton Rouge）与拉斐特（Lafayette）周边区域。洪水沿阿米特河（Amite）、科米特河（Comite）、坦吉帕霍河（Tangipahoa）、蒂克福河（Tickfaw）、弗米利恩河（Vermilion）及默芒托河（Mermentau）等多条河道蔓延。本次降雨事件期间，路易斯安那州巴吞鲁日市东北侧的沃森（Watson）地区录得累计降雨量超31英寸。

由美国地质调查局（U.S. Geological Survey，USGS）运营的河道流量监测站数据显示，6处站点的峰值流量达到有记录以来的最高值，另有16处站点的峰值流量跻身有记录以来的前5位。2016年8月，美国地质调查局水文测量人员在路易斯安那州的河道超过##个监测点位完成了超过##次流量测量工作，其中多数测量旨在验证该机构运营的监测站点的水位-流量关系精度。

风暴过后，美国地质调查局水文测量人员在路易斯安那州共回收并记录了590处洪水高水位标记。其中多数高水位标记被用于为2016年8月遭遇洪涝的路易斯安那州部分受影响区域绘制12幅洪水淹没范围图。