LWI Region 3 Modeling Overview

2 LWI Model Development Phases

WSP developed hydrologic and hydraulic models for the Louisiana Watershed Initiative over three phases:

1. Data Collection & Modeling Methodology Development

3. Design Storm Events & Consequence Assessment

2. Model Development & Calibration

1. Data collection and modeling methodology development: During the first phase, existing model and supporting data was collected, including the following:

{ Previous watershed studies: USACE Corps Watershed Model System model for the Ouachita River, Federal Emergency Management Agency (FEMA) studies, and inundation maps from the March 2016 event { Existing channel/hydraulic structure survey: channel modification plans from the Tensas River Levee District, pump operation manuals, hydraulic structure data from past studies, and GIS-based survey data for the City of Monroe { Historical flood information: Newspaper accounts of past events, FEMA claims data, Louisiana Watershed Resiliency (LaWRS) data

{ Observed data: USACE and USGS stage and flow datasets and high water marks { Landuse and soils data: National Land Cover Database (NLCD) and Natural Resources Conservation Service (NRCS) soils datasets for each parish in Region 3 { Development of modeling methodologies: detailed reports describing watershed characteristics and appropriate modeling methodologies (one-dimensional [1D] vs. 2D, HEC HMS, ROM, etc.)

8

LWI REGION 3 TRAINING

LOUISIANA WATERSHED INITIATIVE