1. Using GIS to Plan for and Mitigate Flooding on Tribal Lands
Gila River Indian Community
Department of Land Use Planning & Zoning
Flood Control Engineering Section
Presented by:
Seaver Fields III, Project Coordinator, CFM
AGIC Annual Conference
Prescott, AZ
September 22, 2016
Using GIS to Plan for and Mitigate Flooding on Tribal Lands

2. Overview Disclaimer Location Mission and Vision Primary Tools
Data Process and Analysis
Requested Projects
Special Projects
Questions

3. Disclaimer
Most examples shown are from the Komatke Area Drainage Master Study. Atkins, HELM, JE Fuller, & Gunn Communications are the developers of this study. This study was accepted by the Community on April 2016.
Also! For purposes of being conservative, I will consider myself a beginner using GIS, CAD and the hydrologic software used to develop this presentation. I am still in training on all software, so some results are VERY preliminary. Please consider this upon critiquing results.
Last but not least… a proposed project shown is conceptual and not approved by the Gila River Indian Community. I still need to weed out some issues. Your the first group to see these conceptual solutions. Consider yourself special. The results will require detailed internal and external feasibility analysis such as identifying Cultural Resources or utility conflicts. This will be forthcoming.

4. Gila River Indian Community

5. Flood Control Mission and Vision
Our Mission:
To protect the people, the environment, property, save costs and reduce liability and future flood losses by creating balanced drainage systems across the Community.
Our Vision:
To provide uniform, efficient and self sustainable regional flood control infrastructure and non-structural projects that consider the natural characteristics of the lands while meeting or exceeding the Community’s needs for flood control.

6. Primary Tools
ArcMAP GIS
AutoCAD Civil 3D
Flo-2D
HEC-RAS 2D

7. Primary Tools ArcMAP GIS Repository of existing information:
Addressing
Utilities
Terrain
Aerials
Shapefiles
Other Jurisdictions
Internet Applications
Pre-Process data
Post-Process data
Display Results

8. DATA COLLECTION AND INPUT
Process and Analysis
Hydrologic Program
Existing Conditions
DATA COLLECTION AND INPUT
DATA OUTPUT
EXPORT Pre-Processed data

9. Process and Analysis Data Input (Collection) Aerial Photogrammetry
At a Minimum:
Terrain
Aerial Photogrammetry
Topography from Surveyors
USGS DEMs
Light Detection And Ranging (LiDAR) raster(s)
Rainfall data (gages)
Flood Control District of Maricopa County
NOAA
USGS
Infiltration data
USDA Soil Survey for the Gila River Indian Community
NRCS Web Soil Survey
Shapefiles – Attribute Tables
Land Characterizations (Land Uses)
Assigning Manning’s ‘n’ roughness values
Cross sections for discharge interests
Study Boundary
Structures/Utilities

10. Process and Analysis
Data Input (Example)

11. 2-Dimensional Unsteady State Analysis
Process and Analysis
Data INput
2-Dimensional Unsteady State Analysis
Tabulate Hydraulics
Define Floodplain Limits
Input design parameters
No Hydrology, yet!
Tabulate Hydrology
Tabulate Hydraulics
Hydrograph Development

12. Process and Analysis Data Output Hydrographs!!! Peak flows Volumes
Timing!!

13. Process and Analysis Data Output GIS displays results Depth Discharge
Velocity
Hazard Analysis:
Depth * velocity
Combinations
Gridded data display
Flow Direction

14. Requested Projects

15. Requested Projects

16. EXPORT Pre-Processed Data
Process and Analysis
Proposed Conditions
Hydrologic Program
DATA OUTPUT
Project Design
EXPORT Pre-Processed Data
Export DEM Surface

17. Area Drainage Master Studies
Special Projects
Area Drainage Master Studies
Sacaton ADMS
Casa Blanca ADMS
Komatke ADMS

18. Chandler Heights Flood Mitigation Project
Special Projects
Chandler Heights Flood Mitigation Project
Before
After

19. Komatke Regional Flood Control Project
Special Projects
Komatke Regional Flood Control Project
Proposed
Currently

20. Questions?