Flooding adapted from a presentation by Prof. David R. Maidment

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Floodingadapted from a presentation by Prof.
David R. Maidment
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Flooding Manawatu, New Zealand
http//www.ourregion.co.nz/home.php
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Bridges that Work
http//www.ourregion.co.nz/home.php
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Bridges that dont work
Small bridge on a country road is washed away
http//www.ourregion.co.nz/home.php
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http//www.tsarp.com/
Most costly urban flood disaster in the history
of the United States
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Major Highways during Tropical Storm Allison
I-10 West
I-45 South
http//www.chron.com/content/chronicle/special/01/
flood/
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Kayaking on US 59, Houston(Tropical Storm
Allison)
http//www.chron.com/content/chronicle/special/01/
flood/
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Residential Flooding in Tropical Storm Allison
http//www.chron.com/content/chronicle/special/01/
flood/
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The Human Cost
Saving the wedding photos
Cleaning out the car
http//www.chron.com/content/chronicle/special/01/
flood/
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5-day rain total (Tropical Storm Allison)
City of Houston
Harris County
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12-hour rain total (Tropical Storm Allison)
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Extreme Rainfall Statistics (Tropical Storm
Allison)
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73,000 houses and apartment buildings flooded
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Watersheds
Stream gaging station
Watershed area that drains to a particular
river or stream network
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Floodplain maps(White Oak Bayou, Houston)
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What can we do about floods?

• Engineering structures
• Dams and detention ponds to hold back flood
  waters
• Increase capacity of streams to carry floods
• Better flood planning
• Create floodplain maps to define at-risk areas
• Restrict building foundations are at least 1 foot
  above 100-year flood elevation
• Develop flood forecasting and warning systems

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Regional Storm Water Modeling Program and Master
Plan for San Antonio
City of San Antonio
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San Antonio Regional Watershed Modeling System
Geospatial Data City, County SARA, other
Bring the models together
Modeling System
Rainfall Data Rain gages Nexrad
Calibration Data Flows Water Quality
Floodplain Management
Capital Improvement Planning
Water quality planning
Integrated Regional Water Resources planning
Flood Forecasting
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Nexrad Map to Flood Map in Arc 9 Model Builder
Flood map as output
Model for flood flow
HMS
Model for flood depth
Nexrad rainfall map as input
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TxDOT Sand Filter
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Central Park Wet Pond (Austin)
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Extended Detention Basin