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Floodwater Management in Dallas, TX
Stephen SwanCE 394K 2April 22, 2010
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OUTLINE
Project BackgroundDallas and the Trinity RiverFlood of 1908Current Flood Control MeasuresInitial ModelingFuture Work
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CITY OF DALLAS
Population: 1.2 million 8th largest city in the nation Average annual precipitation
Rainfall: 33.7 in Snow: 2.5 in
Located along the Trinity River in the Upper Trinity River Basin
http://www.dallascityhall.com/info/about.html
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TRINITY RIVER AT DALLAS
Three forks meet before Dallas Clear, West, and Elm Forks East Fork meets southeast of Dallas
River course 710 mile length Empties into the Gulf of Mexico
Average annual flow Last ten years: 800 - 4000 cfs
http://en.wikipedia.org/wiki/File:Trinity_Watershed.png
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FLOOD OF 1908 Worst recorded flood in Dallas’ history Trinity River
52.6 feet deep 1.5 miles wide
Estimated damage : $2.5 million 4,000 people left homeless Five were killed Began the design and implementation of flood control
systems in Dallas
http://www.dallashistory.org/history/dallas/dallas_history.htm
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DALLAS FLOOD CONTROL Levees
East Levee: 11.5 mi West Levee: 13.4 mi Rochester Levee: 5.1 mi Average height: 28 ft
Pumping Stations Stations: 16 Pumps: 63 Flow rate: 4,399 cfs
Pressure Sewers Sewers: 6 Flow rate: 19,868 cfs
http://www.ci.dallas.tx.us/sts/html/fc.html
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LEVEE SYSTEM
Appendix A, Periodic Inspection Report, Dallas Floodway Project, USACE
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USACE PERIODIC INPECTION 2007
USACE 5 year inspection Dallas levee system Unacceptable East levee
47% below Standard Project Flood West levee
42% below Standard Project Flood Issues with other flood protection
Periodic Inspection Report, Dallas Floodway Project, USACE
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HEC-HMS MODELING
water.usgs.gov
USGS Streamflow Gauge 08057000 at Downtown Dallas
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HEC-HMS MODELING
Jessica Baker, Halff Associates
Cedar Springs Branch at Turtle Creek
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HEC-HMS MODELING
Appendix A, Periodic Inspection Report, Dallas Floodway Project, USACE
100-year conditions outflow at Cedar Springs Branch, Junction 8
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HEC-SSP MODELING
Annual peak flows for USGS 08057000 at Dallas, TX
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HEC-SSP MODELING
Annual peak flows distribution
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FUTURE WORK
HEC-RAS Modeling Model the current levee system against 100-year
flood conditions Determine levee failures from the 100-year flood Compare 100-year flood failures to Standard
Project Flood failures
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QUESTIONS?