Questions concerning the Halloween Flood in Onion Creek Presentation by David R. Maidment Center for Research in Water Resources University of Texas at.

Slides:



Advertisements
Similar presentations
Hurricane Storm Surge Forecasting for Coastal Rivers David Welch, Senior Hydrologist Dave Ramirez, P.E., Senior Hydrologist National Weather Service Lower.
Advertisements

NOAA’s NWS and the USGS: Partnering to Meet America’s Water Information Needs Ernie Wells Hydrologic Services Division NOAA National Weather Service May.
National Flood Interoperability Experiment (NFIE)
Fort Bend Flood Management Association Flood Risk Reduction Symposium October 3rd, 2014 (Part-A) Brazos River at San Felipe - USGS Gage Fort Bend County.
Reading: Applied Hydrology Sections 14-5, 14-6
Risk Analysis Division — Risk MAP Considerations for Developing Rainfall- Runoff Models for Large Watersheds – Passaic River Watershed, New Jersey Presented.
Tropical Storm Hermine & it’s Impact on Texas Steven Vargas, PE.
Upper Brushy Creek Flood Study – Flood mapping and management Rainfall depths were derived using USGS SIR , Atlas of Depth Duration Frequency.
Reading: Applied Hydrology, Sec 15-1 to 15-5
Application of HEC- HMS for Hydrologic Studies Texas A&M University Department of Civil Engineering CVEN689 – Applications of GIS in CE Instructor: Dr.
NOAA’s NWS and the USGS: Partnering to Meet America’s Water Information Needs Dr. Thomas Graziano Acting Chief, Hydrologic Services Division Office of.
Oregon Flood Hazard Data Standard v2.0 Summary of Proposed Amendment Collaborative Effort of: Jed Roberts (DOGAMI), Steve Lucker & Christine Shirley (DLCD)
National Flood Interoperability Experiment (NFIE) NFIE in a Nutshell Prepared by David R. Maidment Center for Research in Water Resources University of.
CE 397 Flood Forecasting Lecture 3: Review of Concepts and Definitions.
Update on the NFIE Presentation to the Subcommittee on Spatial Water Data By David R. Maidment Center for Research in Water Resources University of Texas.
Texas A&M University Department of Civil Engineering Cven689 – CE Applications of GIS Instructor: Dr. Francisco Olivera Logan Burton April 29, 2003 Application.
DAVE REED HYDROLOGIST IN CHARGE NOAA/NWS LOWER MISSISSIPPI RIVER FORECAST CENTER Datums and Stages - Importance to the NOAA/NWS Hydrologic Services Program.
Tropical Storm Allison & its impact on Harris County
History and Evolution of the PMP/PMF
Integration Of Stormwater Master Plans with Watershed Plans The Link between Flooding and Development September 23, 2008 Bob Murdock, P.E., CFM.
Upper Brushy Creek Water Control & Improvement District
DICKINSON BAYOU WATERSHED GALVESTON COUNTY, TEXAS Jason Christian, P.E. National Flood Workshop October 24-26, 2010 – Houston, Texas PROBABILISTIC FLOODPLAIN.
National Flood Conference April 22, 2009 Victor Hom Hydrologic Services Division Office of Climate, Water and Weather NOAA’s National Weather Service National.
Predicting and Preparing for Natural Disasters Margaret A. Davidson Director NOAA Coastal Services Center June 7, 2005.
FLASH FLOOD PREDICTION James McDonald 4/29/08. Introduction - Relevance  90% of all national disasters are weather and flood related  Central Texas.
Central Valley Flood Protection Board August 9, 2013 Presented by: Michael Mierzwa California Department of Water Resources DWR’s Involvement in Flood.
National Weather Service Flood Inundation Mapping A New Way A New Wayof Looking at Flooding Diane Cooper Hydrologic Services Program Manager NWS - Southern.
National Weather Service - Southeast River Forecast Center Southeast River Forecast Center North Florida Visit July 17-20, 2006 Southeast River Forecast.
National Weather Service Products on the Internet Erik Heden Meteorologist NWS Weather Forecast Office Binghamton, NY Patti Wnek Service Coordination Hydrologist.
NOAA’s NWS and the USGS: Partnering to Meet America’s Water Information Needs Dr. Thomas Graziano Chief, Hydrologic Services Division NOAA National Weather.
Hurricanes …no two are the same… Bill Read Director National Hurricane Center.
Assessment of Economic Benefits of the North Carolina Floodplain Mapping Program Hydrologic and Hydraulic Case Studies Adapted from a Presentation to NRC.
Prepared by: Burnham – Floodplain Study October 23, 2009 Presented by: Marty Spongberg, PhD, PE, PG AMEC Geomatrix, Inc.
Situational Awareness for Flash Flooding By David R. Maidment and Fernando Salas Director, Center for Research in Water Resources Cockrell School of Engineering.
Development of a Geographic Framework for an Integrated Flood Modeling System Oscar Robayo Tim Whiteaker August 10, 2004 University of Texas at Austin.
Page 1 Advanced Hydrologic Prediction Services NWS Inundation Mapping Eastern Region Flash Flood Workshop June 4, 2010 Presentation by Laurie Hogan NOAA/NWS.
Introduction to GIS in Water Resources David R. Maidment Director, Center for Research in Water Resources University of Texas at Austin CRWR.
Boise River, Idaho: Many Agencies Working Towards One Version of the Truth Ellen Berggren, USACE Walla Walla District Idaho Silver Jackets USACE Flood.
Harrisburg Flood Inundation Mapping Project – Many Agencies Working Together USACE Flood Risk Management and Silver Jackets Workshop 23 August 2012 Presented.
Hazards Profile. Objective: To identify key hazards issues and priorities Identify information gaps to address these concerns.
Introduction to Urban Hydrology
The Effect of Urbanization to the surface-water runoff The comparison between the urbanized and undeveloped zones.
Flood Mapping: Hydrology and Communities 2013 Boulder Floods Presented by: Sandra Sweat Fall 2015 Professor: Dr. David Maidment.
Hurricane Irene in Connecticut River Milena Spirova CE 394 K 2015.
WATERWAYS AND BRIDGES IN TEXAS “Final” Presentation by: Brandon Klenzendorf CE 394K Dr. Maidment.
Hydrology & Water Resources Engineering ( )
MAINE DEPARTMENT OF ENVIRONMENTAL PROTECTION MAINE DEPARTMENT OF ENVIRONMENTAL PROTECTION Protecting Maine’s Air, Land and Water MAINE.
2006 Flood in El Paso TX.
Meeting 02/27/2017 Short Overview UH-DAIS Lab Research
Hurricane Harvey: A call for new data, science and services
Flooding adapted from a presentation by Prof. David R. Maidment
Hydraulic Routing in Rivers
Meeting 02/27/2017 Short Overview UH-DAIS Lab Research
National Flood Interoperability Experiment Alabama Case Studies
Introduction to Urban Hydrology
flooding and housing buyouts in onion creek
Data Sources for GIS in Water Resources by David R
Flood Monitoring Tools 2011 OFMA Annual Conference
Hydrology.
Water Quality Protection Zones
Onion Creek Flooding, 30 October 2013
Central Texas Hill Country flooding
Love Field Modernization Program
Central Texas Hill Country flooding
Flood Modeling Tools for Response and Alerting
Flood Inundation Mapping using Height Above Nearest Drainage Method
Situational Awareness for Flash Flooding
National Flood Interoperability Experiment (NFIE)
National Flood Interoperability Experiment
Flood Inundation Mapping
Presentation transcript:

Questions concerning the Halloween Flood in Onion Creek Presentation by David R. Maidment Center for Research in Water Resources University of Texas at Austin Public Safety Commission City of Austin 7 July 2014

David R. Maidment On the faculty of the University of Texas at Austin since 1981 in the Civil, Architectural and Environmental Engineering Department Teach hydrology, hydraulics and geographic information systems in water resources Chair of National Academy of Science Reviews of FEMA Floodplain Mapping in 2007 and 2009, and presently on the National Academies Committee on Flood Insurance Affordability Chair of the National Academies Mapping Sciences Committee

Three Questions Posed by the City of Austin 1.Unique characteristics of the Onion Creek watershed and to compare and contrast the Halloween flood with previous floods in that watershed 2.Impervious cover and its effect on the flood waters that day 3.Future risk, particularly in light of continued rapid urban growth in this part of central Texas

Three Questions 1.Unique characteristics of the Onion Creek watershed and to compare and contrast the Halloween flood with previous floods in that watershed 2.Impervious cover and its effect on the flood waters that day 3.Future risk, particularly in light of continued rapid urban growth in this part of central Texas

Onion Creek Flooding, October 2013 A flooded home location IH-35 William Cannon Dr

FEMA Flood Hazard Zone

Drainage Area above Home Drainage area = 732 km 2, or 282 miles 2 Watershed delineation using ESRI Watershed Delineation Services

Frequency Analysis of Halloween Flood Halloween Flood (135,000 cfs) Discharge (cfs) Return Period (Years)

Flood Water Elevations Halloween FloodHurricane Storm Surge on Gulf Coast 16 ft above major flood stage 16 ft of storm surge ~ Cat 3 hurricane

Responses to Question One Unique characteristics of the Onion Creek watershed and to compare and contrast the Halloween flood with previous floods in that watershed Onion Creek has a huge watershed equivalent in area to the entire City of Austin The area flooded during the Halloween flood is within the 100-year floodplain defined by FEMA The magnitude of the observed flood is within the range that could have been anticipated from past flood events. It is not “off the charts” The flood peak stage was about 16 ft above “major flood stage” ~ Category 3 hurricane storm surge on the Gulf Coast

Three Questions 1.Unique characteristics of the Onion Creek watershed and to compare and contrast the Halloween flood with previous floods in that watershed 2.Impervious cover and its effect on the flood waters that day 3.Future risk, particularly in light of continued rapid urban growth in this part of central Texas

Land Cover in the Onion Creek Watershed (2006) 34% Forest 43% Shrub, Grass 19% Developed 4% Other

From NLCD – Change in Impervious Cover from 2001 to 2011

Change in Impervious Cover from 2001 – 2011 with Halloween Rainfall

Upper Onion Creek Future Conditions Study (City of Austin) Hays County Master Plan % impervious cover increased to 15% in each subbasin unless already greater than 15%, then left unmodified Average increase in design flow at Twin Creeks gage 25-year flow increases from 47,300 to 50,200 cfs 100-year flow increases from 87,600 to 89,300 cfs Evaluation of Increased Development in Buda Area % impervious cover within Buda ETJ increased to 47% Less than 0.5% incremental increase in flow over master plan Note: Hays County master plan design flows are lower than the effective FEMA flows. For details please refer to City of Austin Watershed Protection Department

Actual Rainfall Totals Onion Creek watershed

Onion Creek and the Blanco River

Responses to Question Two Impervious cover and its effect on the flood waters that day Onion Creek is about 20% developed, concentrated in the lower end of the watershed In Halloween Flood, the major rainfall was over the rural part of Onion Creek not the urbanized part Urbanization did not have a major effect on the Halloween flood but could do so in future storms if rainfall were centered on the lower part of the watershed

Three Questions 1.Unique characteristics of the Onion Creek watershed and to compare and contrast the Halloween flood with previous floods in that watershed 2.Impervious cover and its effect on the flood waters that day 3.Future risk, particularly in light of continued rapid urban growth in this part of central Texas

Anne Castle, Asst Secretary for Water and Science, Dept of Interior “Today we have unprecedented opportunities to use science and technology to create a better understanding of one of our most precious resources – water” “I am committed to working with you to do that” New Open Water Data Initiative Chair

National Water Center Opened by National Weather Service at the University of Alabama in Tuscaloosa in May 2014 Will synthesize work of present 13 regional River Forecast Centers Like National Hurricane Center Offers new opportunities to integrate national and local efforts for flood forecasting

National Water Data Infrastructure David R. Maidment, University of Texas at Austin NWS National Water Center Opening Tuscaloosa, Alabama 13 May 2014 Complete presentation:

National and Local Flood Modeling NWS River Forecast Center City of Austin

Real-Time Flood Inundation Mapping on Onion Creek (USGS/NWS) Gage at Highway 183

FEMA Flood Hazard Zone

17’ AHPS Flood Warning Stage

21’ NWS issues Flood Warning for Onion Creek (issued at 02:44)

25’ NWS issues Flood Warning for Onion Creek at 03:40 – gauge will rise to 25.9’

41’ -- At 10:07 – peak of USGS gauge – 40.97’

Inundation Mapping Flood emergency response is tied to the extent of inundation Prepare flood response plan using a “library of inundation maps” 1 ft level increments on all major streams During flood events make probabilistic projections of what flood stage will be reached Work with National Weather Service through National Water Center to create an improved real- time flood data, modeling and inundation mapping procedure

Responses to Question Three Future risk, particularly in light of continued rapid urban growth in this part of central Texas Flooding is a regional phenomenon More detailed modeling of flooding at NWS is feasible through National Water Center Flood inundation mapping is the key interface between hydrology and flood emergency response planning Propose Austin and Halloween Flood as a case study for the National Water Center