Flood Inundation Mapping using Height Above Nearest Drainage Method

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Presentation transcript:

Flood Inundation Mapping using Height Above Nearest Drainage Method David R. Maidment Center for Research in Water Resources University of Texas at Austin Presentation for National Weather Service Leadership Team, 9 January 2016 Acknowledgments: Yan Liu, University of Illinois; David Tarboton, Utah State University; Xing Zheng, University of Texas at Austin; City of Austin, National Weather Service, NCAR, Texas Division of Emergency Management, ESRI, Kisters, National Science Foundation, colleagues and students at UT Austin.

Flood Mapping Levels Level 1 – approximate inundation mapping Level 2 – approximate impact mapping Level 3 – detailed inundation mapping Level 4 – detailed impact mapping Uses National Elevation Dataset and rating curves Impact at County scale Uses LIDAR and detailed hydraulic modeling Impact at Stream Reach scale

Real-Time Flood Inundation Mapping Onion Creek at Highway 183 http://water.weather.gov/ahps2/inundation/inundation_google.php?gage=atit2

Method for Determining Flood Risk: Height Above Nearest Drainage (HAND) Flooding occurs when Water Depth is greater than HAND Flood HAND Normal

Continental-Scale Flood Inundation Mapping Catchments and Flowlines Height Above Nearest Drainage (HAND) (relative elevation of land surface cell above cell in stream to which it flows) Digital Elevation Model

USGS Rating Curve at a Stream Gage Onion Creek at Highway 183 Measure Water Level Determine Discharge

Reach Hydraulic Parameters Comid y A R P T V Ab As 5781175 3 4 As Surface Area Wetted Bed Area Ab L V Volume T 𝐴= 𝑉 𝐿 Cross Section Area Depth y A P= 𝐴𝑏 𝐿 P Wetted Perimeter T= 𝐴𝑠 𝐿 Top Width R= 𝐴 𝑃 Hydraulic Radius

Rating Curve – Connects Discharge with Depth Forecast Discharge, Q, from National Water Model Flood Depth, y (ft) 𝑄= 1.49 𝑛 𝐴 𝑅 2/3 𝑆 𝑜 1/2

Continental-Scale Flood Inundation Mapping 1. Forecast discharge with National Water Model 2. Convert discharge to depth using rating curve 3. Convert depth to inundation using HAND 1 2 3

Continental-Scale Flood Inundation Mapping Process, Version 1 Alpha South Texas and Louisiana Source of Map: Yan Liu, University of Illinois at Urbana-Champaign

South Texas and Louisiana Sabine Lake

Water Map Under Normal Flow Conditions Sabine Lake Swamp and Marsh

Water Map with Flood Inundation

Regional Flood Inundation Source of Map: Christian Kessler, Brigham Young University

Regional Flood Impact National Land Cover Dataset Source of Map: Christian Kessler, Brigham Young University

HAND comparison between LIDAR and NED Inundated Area in Autauga County, AL Source of Data: Xing Zheng, University of Texas at Austin

Texas Address Points Used for dispatching emergency 8.6 million points Used for dispatching emergency response vehicles in e-911 systems

Statewide Addresses with HAND 237 counties mapped 16 CSEC counties geocoded 1 non-CSEC county geocoded Statewide Addresses with HAND

Flood Inundation Mapping in Texas (Texas Division of Emergency Management) Provides real-time access to National Water Model forecasts Discharge converted to Depth using Rating Curves for all 100,000 reaches Built using Kisters Big Data system (KiBiD) in Aachen, Germany

Real Time Charts for Discharge and Depth Discharge Forecast cfs Water Level Forecast ft

Williamson Creek, South Austin: address points attributed with HAND

Williamson Creek, South Austin: Comparison with detailed engineering modeling

Collaboration between Austin Fire Dept and Flood Early Warning System Flood operational maps for 21 Austin creeks Tested in table top exercises Being deployed in fire trucks in paper and pdf format in Jan-Feb 2017

Flood Operational Maps

Flood Mapping Levels Level 1 – approximate inundation mapping Level 2 – approximate impact mapping Level 3 – detailed inundation mapping Level 4 – detailed impact mapping Uses National Elevation Dataset and rating curves Impact at County scale Uses LIDAR and detailed hydraulic modeling Impact at Stream Reach scale

Summary A Continental-Scale Flood Inundation Mapping Process, Version 1 Alpha exists We hope to have a Version 1 Beta for external testing at 2017 Summer Institute Need to connect with existing National Water Model map outputs Should we do a presentation at White House Conference Center later in the Spring as we did at the beginning of the National Flood Interoperability Experiment?