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

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Presentation transcript:

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

Flooding Manawatu, New Zealand http://www.ourregion.co.nz/home.php

Bridges that Work http://www.ourregion.co.nz/home.php

Bridges that don’t work Small bridge on a country road is washed away http://www.ourregion.co.nz/home.php

http://www.tsarp.com/ Most costly urban flood disaster in the history of the United States

Major Highways during Tropical Storm Allison I-10 West I-45 South http://www.chron.com/content/chronicle/special/01/flood/

Kayaking on US 59, Houston (Tropical Storm Allison) http://www.chron.com/content/chronicle/special/01/flood/

Residential Flooding in Tropical Storm Allison http://www.chron.com/content/chronicle/special/01/flood/

The Human Cost Saving the wedding photos Cleaning out the car http://www.chron.com/content/chronicle/special/01/flood/

5-day rain total (Tropical Storm Allison) City of Houston Harris County

12-hour rain total (Tropical Storm Allison)

Extreme Rainfall Statistics (Tropical Storm Allison)

73,000 houses and apartment buildings flooded

Watersheds Stream gaging station Watershed = area that drains to a particular river or stream network

Floodplain maps (White Oak Bayou, Houston)

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

Regional Storm Water Modeling Program and Master Plan for San Antonio City of San Antonio Good morning. It’s my pleasure to share with you an example of regional cooperation within Bexar County.

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

Nexrad Map to Flood Map in Arc 9 Model Builder FLOODPLAIN MAP Flood map as output Model for flood flow HMS Model for flood depth Nexrad rainfall map as input

TxDOT Sand Filter

Central Park Wet Pond (Austin)

Extended Detention Basin After the basin had been in operation for several months. Two outlet risers to get the capacity for flood control, since this is a flow through EDB, couldn't put any more of a backwater on the existing upstream SD. There was a buried bridge at this locaiton, not shown on the as-builts, large amounts of broken concrete with rebar. We took two boring logs, niether hit the material. The CCO for this site exceeded the bid price for the basin. The contractor constructed the outlet too high, ended up leaving that, with reduced slope between inlet and outlet, a retrofit issue.