HEC RAS 2D - Modelling Floodways Part 1

Today, we will be covering a two part series that involves developing a Floodway in HEC-RAS 2D. This demo within the two part series uses a combination of RAS-MAPPER and QGIS to initially buffer the floodway encroachments. Once these floodway encroachments are initially buffered within QGIS, then we will shape the encroachments with the reshape features tool in QGIS. The first part of the series involves developing the Floodway and the second part of the series involves post processing of the floodway polygon.

Make sure to like and subscribe to the channel!

Google Share Link:
1. Includes Example comparison script used for video.
2. Includes the symbology used for the comparison data set.
https://drive.google.com/drive/folder...

🔥Chapters:

00:00 Introduction
00:53 Floodway Overview
03:14 Setup
05:10 Calculating Existing Unit Discharge
05:56 Developing Initial Encroachment Regions within RAS
07:00 Setting up Floodway Plan File in HECRAS
07:42 Setting up Comparison Dataset in RASMAPPER
10:23 Setting up Comparison Dataset Symbology
11:25 Exporting Encroachment Region from RASMAPPER to a shapefile
12:48 Importing Encroachment Region into QGIS
13:10 Initial Buffer of Encroachment Shapefile within QGIS
14:10 Importing Encroachment Region into RASMAPPER
15:00 Running Floodway Model Run
15:59 1st Iteration Model Results
16:26 Second Buffer of Encroachment Shapefile within QGIS
17:58 Results from 100-ft buffer of Encroachment Shapefile
18:37 Exporting Results as JPEG in RASMAPPER
19:03 Importing JPEG into QGIS - Reshaping Encroachment shapefile
20:39 Importing Encroachment Shapefile into RASMAPPER
21:30 3rd Iteration Model Results
21:53 Reshaping Encroachment Shapefile in QGIS
23:45 Importing Encroachment Shapefile into RASMAPPER
24:24 Exporting Existing 100yr Inundation from RASMAPPER
25:10 Importing Existing 100yr Inundation boundary into QGIS
25:50 Layers used while reshaping Encroachment Shapefile
26:30 Final Product of developed Floodway


🔥RiverGeeks Socials

➡️LinkedIn:   / kyle-grantham-pe-cfm-b85a8293  
➡️Youtube:    / @rivergeeks  

#GIS #DEM #raster #RiverEngineering #hydrology #esri #arcmap #lidar #qgis #ras #Whitebox #hecras #arcmap #dem #gis #hydraulics #water #dambreach #Floodway #FEMA #hecras2d #waterresources #water

Disclaimer: This video is for demonstration purposes only and it not professional advice. Please use your own engineering judgement for real-world projects.