Accession Number:

AD1082154

Title:

Mississippi River and Tributaries Flowline Assessment Hydrology Report

Descriptive Note:

Technical Report

Corporate Author:

MEMPHIS DISTRICT, ARMY ENGINEER DISTRICT MEMPHIS

Report Date:

2018-12-01

Pagination or Media Count:

718.0

Abstract:

Periodically, a historical flood of record inundates the Lower Mississippi River and tributaries, which calls into question the adequacy of the Project Design Flood PDF. The most recent of these, the 2011 flood, was a result of precipitation that was approximately 60 of the PDF rainfall, yet measured discharges were within 78 to 91 of PDF flows. Thus, the 2011 flood was the impetus for the re-evaluation of the 1955 hydrology that derives the PDF. This assessment replicates the 1955 hydrology with current technological advancements, re-generates that hydrology with a new methodology, and assesses extreme flood events that occurred after 1955. Individual storm event precipitation and temperature point data inputs were pieced together from different archives and converted to raster grids to generate a spatially continuous storm event over the entire Mississippi River Basin for Hypothetical HYPO 52A, 56, 58A, and 63. HYPO 58A remains the PDF storm for the Mississippi River and Tributaries project.

Subject Categories:

  • Hydrology, Limnology and Potamology
  • Geography
  • Civil Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE