Fales River Flood ModelingBrett Andrews

PurposeThe purpose of this project is to analyze historic flood data and to show the extents of the floods based on the elevation of the terrain derived from LiDAR. The years that will be focused on are: 1977, 2008, 2009, and 2010.

Cross Sections• The following cross sections were

created using the 3D Feature to Attribute tool, for the water height and the Interpolate Shape for the Ground.

• Two types of profile graphs −Stream Centerline height at ground and

Flood height.−Cross Sections across the river with

1977 and 2010 and the Ground DEM

Stream Profiles

Cross Sections

Cross Sections

Cross Sections

Cross Sections

Cross Sections

Cross Sections

Basemap• The basemap data was digitized from

a 1:2000 Land Registration and Information Services

• Building were updated using a 2008 Air Photo and missing buildings and roads were added using deflection to create 90 degree corners and perpendicular roads.

Basemap

Flood Extents 1977 & 2010• The following map is showing the

1977 and the 2010 floods overlaid on the basemap.

• The cross sections are labeled with the heights of the 2010 flood.

Flood Extents 1977 & 2010

Hydraulic Gradient Tin and Raster• Tin

−The next 2 maps are showing a gradient tin from slowest to deepest parts of the flood as it followed the river

• Raster−The raster was created from the Tin and

is symbolized based with a gradient fill

Hydraulic Gradient 1977

Hydraulic Gradient 2010

Hydraulic Gradient Raster 1977

Hydraulic Gradient Raster 2010

Past Flood Extents• The next series of map will show the

flood extents from the past 4 biggest floods

• 1977, 2008, 2009, 2010• The floods are layered over the

basemap with the river sitting on top to clearly see the extents of each flood

Flood Extents 1977

Flood Extents 2008

Flood Extents 2009

Flood Extents 2010

ArcScene Composition • The next image is showing the 1977

and 2010 flood extents overlaid on the LiDAR DEM and the base map.

• The Basemap was draped on top of the LiDAR data and the building heights were extracted to make the map 3D

ArcScene Composition

Model Builder

• The Model was created to automate the Flood Polygon creation

• A series of tools were called on in the model

Conclusion • Create flood models from historical

flood data• Created flood extent maps for Raster,

Tins and Polygon• Profile graphs were created to show

the height of the water based on the Ground data

• ArcScene was used to visualize the flood in 3D

Questions & Comments

Sources

• Urban Map: Land Registration and Information Services 1:2000. Mapsheet GREENWOOD- 0244960064920

• LiDAR data gnd345_49792m• Photos: Supplied by Mark Hebert• Software: ESRI ArcGIS Spatial

Analysis and 3D Analysis Suits.