Alluvial Fan Mapping and Risk Assessment

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1 Alluvial Fan Mapping and Risk Assessment Army Corps of Engineers: Webinar Week 12:30PM (MST) Silver Jacket Conference Idaho Department of Water Resources Boise, Idaho

2 Overview PROJECT OVERVIEW EXAMPLE RESULTS RISK TO LIFE & PROPERTY RISK FROM WILD FIRE IDAHO SILVER JACKETS PROGRAM GUIDE Slide Progression

3 What is an alluvial fan? Fan-shaped alluvium deposit Alluvium: loose, unconsolidated sediment Area of decreased flow velocity Typically formed as a stream flattens onto a flatter plain Big Lost River Alluvial Fan and Floodplain, Butte and Custer Counties, Idaho Source: University of Georgia (

4 Alluvial Fan Hazard SEDIMENTS DEPOSITED IN BROAD FLOODPLAIN UNPREDICTABLE LATERAL CHANNEL MIGRATION REDUCED CONVEYANCE ACTIVE EROSION, SEDIMENTATION AND DEPOSITION HIGH- VELOCITY FLOWS

5 Alluvial Fan Example Narrow Gorge Fan Apex Alluvial Fan Death Valley Alluvial Fan Diagram Source: California Institute of Technology (

6 Purpose of Alluvial Fan Project IDENTIFY AREAS OF GREATEST RISK DETERMINE PRESENCE OF ALLUVIAL FANS FAN MANAGEMENT PLAN PROCESS ( FEMA FEB 1989) *Identify the hazard* Plan future development Choose flood mitigation tools Enforce regulations Educate citizens

7 Project Procedures Funded Watersheds Payette Lower Boise Big Wood Teton Upper Spokane Use Existing Data Surficial Geologic Maps AO Zones from FIRMs and DFIRMs

8 Steps Project Initiation/DB Development: 4 months Watershed Evaluations: 3 months each Deliverables: Geodatabase, Report, Outreach Plan, Etc.

9 Previously Mapped Fans: Flood & Geologic Data FIRM/DFIRM & Slope Geologic Soils &Age Alluvial fans depicted as AO zones include depth and velocity estimates. LiDAR and National Elevation Dataset (NED) derived Slopes. Digital/Non-Digital geologic maps usually designate alluvial fans specifically. Very Few of these maps exist in our study areas. Image from Idaho Geological Survey DWM-54. Data from Ada County DFIRM and NAIP Imagery 2011.

10 Teton Watershed Data Availability: Example 1 Watershed Area: 1096 sq.mi. Data Availability: DFIRM coverage 0% FIRM coverage 77% Geologic 0%

11 Risk Potential Based on Geology: Example 1

12 Slope Model: Example 1

13 Identify Potential Fan: Example 1

14 Potential Alluvial Fan: Example 1 Extent in Watershed High Risk Potential (Red)

15 Potential Alluvial Fan: Example 1 Slope Model Imagery: At-risk Property

16 Alluvial Fan Risk in Teton Watershed Values from 2012 Assessors Data Area Average Parcel Value High Parcel Value Parcel Count Teton (Watershed) $127,000 >$666, Fremont (County) $92,000 >$1,447, Madison (County) $144,000 >$526, Teton (County) $130,000 >$780, Driggs (City) $122,000 >$426, New Dale (City) $70,000 >$143, Rexburg (City) $206,000 >$770, St. Anthony (City) $72,000 >$166, Sugar City (City) $114,000 >$300, Teton (City) $64,000 >$111, Tetonia (City) $67,000 >$138, Victor (City) $122,000 >$250, Area % Parcels in Potential Fan % High Value Parcels in Fans Total Value in Fan Teton (Watershed) 35% 26% $909,786,000 Fremont (County) 3% 0% $43,982,000 Madison (County) 0% 0% $0 Teton (County) 52% 38% $868,777,000 Driggs (City) 6% 0% $9,905,000 New Dale (City) 0% 0% $0 Rexburg (City) 0% 0% $0 St. Anthony (City) 4% 4% $4,956,000 Sugar City (City) 0% 0% $0 Teton (City) 0% 0% $0 Tetonia (City) 0% 0% $0 Victor (City) 100% 100% $14,275,000

17 Payette Watershed Data Availability: Example 2 Watershed Area: 1224 sq.mi. Data Availability: DFIRM coverage 8% FIRM coverage 62% Geologic 0%

18 Potential Alluvial Fan Example #2 Extent in Watershed High Risk Potential (Red) Moderate Risk (Yellow)

19 Potential Alluvial Fan Example #2 Slope Model Imagery: At-risk Property

20 Replicable Methodology Flood Hazard and Geologic Age Map all existing alluvial fans from DFIRMs, FIRMs and Surficial Geologic Maps Create alluvial fan risk potential layer by categorizing existing soil composition spatial data Quatemary soils = High Hazard Potential Late Pleistocene and Holocene deposits =Moderate Hazard Potential Mid and Early Pleistocene deposits = Low Hazard Potential LiDAR/NED Derived Slopes Gather best available LiDAR and DEMs We used the NED as base data, adding more refined where available Re-project all layers to the same projection and use LiDAR to create DEM Resample all layers to the smallest meter grid of all data Merge DEMs together Create Slope layer from merged DEM layer

21 Foreign Alluvial Fan Risk to Life and Property Caraballeda Fan, Venezuela December 1999 Tens of Thousands of Deaths Thousands of Homes Destroyed Aerial view of debris-flow deposition resulting in widespread destruction on the Caraballeda fan of the Quebrada San Julián. Avulsion of the main channel (left side of photo) resulted in deposits up to 6-m in thickness and totaling about 1.8 million cubic meters of bouldery debris. Secondary new flood channels are visible through center of fan to the lower right of photo. Photo by Lawson Smith, USACE (USGS 2001)

22 Domestic Alluvial Fan Risk to Life and Property Magnesia Spring Canyon Alluvial Fan Rancho Mirage, CA July Death $7 Million Damage Image taken from FEMA 165 (1989)

23 Values from 2010 Assessors Data Alluvial Fan Risk to Property 1 Alluvial Fan 18 Properties including 5 Properties with Lot Values Only Residential Use $16,591,112 Market Value $9,074,528 Residential Value Not a Mapped AO Zone

24 Alluvial Fan Risk to Eagle, Idaho Average Parcel Value High Value Parcel $269,000 >$562, Parcel Count % of Parcels in Potential Fans % of High Value Parcels in Fans Total Parcel Value in Fans 48% 20% $924,490,000 Values from 2012 Assessors Data

25 Historic Fires and Potential Alluvial Fans in Eagle Collection Basin above Potential Fan (HUC12) Streams flow from basin onto the Potential Fan (NHD) Predictive Risk identified

26 Current Fire and Potential Alluvial Fans in Big Wood Watershed Idaho communities can predict where there could mudslides and/or debris flows on alluvial fans following wildfire events Communicate with Partners: City County FEMA Idaho Homeland Security USFS Burned Area Emergency Response (BAER) teams Army Corps of Engineers USGS NWS

27 Idaho Silver Jacket Program Guide FEDERAL STATE Federal Emergency Management Agency (FEMA) Flood Mitigation Assistance, National Flood Insurance Program, Community Rating System, Hazard Mitigation, Pre-Disaster Mitigation, Repetitive Flood Claims, Severe Repetitive Loss, Public Assistance, Regional Catastrophic Preparedness, Risk Mapping, Assessment and Planning, Dam Safety, Community Disaster Loan, Individuals and Households, Historic Preservation and Cultural Resources, Cora Brown Fund, Housing Assistance, Direct Housing Assistance, Fair Market Rate Rental Assistance, Emergency Management Performance, Homeland Security Grant & Citizen Corps Program National Weather Service (NWS) Northwest River & Colorado Basin River Forecast Centers, Advanced Hydrologic Prediction Service, NWS StormReady Program, NOAA Weather Radio All Hazards, Automated Surface Observing Systems & Cooperative Observer Program Natural Resources Conservation Service (NRCS) Emergency Watershed Protection, Watershed and Flood Prevention, Watershed Survey and Planning & Dam Rehabilitation Assistance Army Corps of Engineers (USACE) Emergency Preparedness, Response and Recovery, Planning Assistance to States, Continuing Authorities Program, Floodplain Management Services, General Investigations, Inspection of Completed Works & Rehabilitation and Inspection Programs United States Geological Survey (USGS ) Natural Hazards Program, Water Programs, Flood Information, WaterWatch, Water Data for the Nation, WaterAlert, StreaMail & Webcams Bureau of Homeland Security (IBHS) Response and Recovery Operations, Trainings, Exercises, NIMS, Recovery, Alerts, Warnings, Preparedness and Protection Planning, Hazard Mitigation, Critical Infrastructure, GIS, WebEOC, Public Safety Communications, E911, SIEC, Hazardous Materials, Public- Private Partnerships, Citizens, Volunteers, Grants and Logistics Environmental Quality (IDEQ) Public Water System Planning, Public Wastewater System Planning, Green Project Reserve, Public Water System Construction Loans, Public Wastewater System Construction Loans, Source Water Protection, Nonpoint Source, Certified Drinking Water Haulers, Training & Idaho Environmental Guide Water Resources (IDWR) Idaho Flood Hazard Maps, IDWR Training, State Floodplain Manager (CAP-SSSE) & Dam Safety Office Idaho Silver Jacket Agency Flood Risk Program Guide, January 2013

28 Thank you!! Note: Please use the webinar chat feature to write down your questions so you don t forget, we will answer questions after both presentations. Ryan McDaniel, CFM PMP Idaho Risk MAP Program Manager Melissa Harris GIS Analyst Thanks again!

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