overview - dallas meeting...overview flood system overview flood control operations successes and...
TRANSCRIPT
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Overview
Flood System Overview
Flood Control Operations
Successes and Opportunities
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Flood Management in Dallas
Regional Drainage Infrastructure: Dams, multi-
purpose reservoirs, channels and wetlands on
the river-side of the levees to convey large
volume events and protect urbanized areas
Local, “Interior” Drainage Infrastructure: local
drainage systems (levees, pump stations,
pressure sewers, streams, creeks, channels, and
storm sewers) to address runoff from the land-
side of levees to convey it into the Trinity River)
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Trinity River Watershed
Trinity River watershed extends from near Oklahoma border to Galveston Bay (shown
in aqua)
Trinity River drains a total area of >16,000 square miles
About 6,050 square miles drain through Dallas Floodway
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Area Reservoirs
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USGS River Gage Locations
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Lake Ray Roberts
Lake Lewisville
Lake Grapevine
Elm Fork @ Carrollton
Elm Fork @348
West Fork @ Grand PrairieTrinity River @ Commerce
Trinity River below Dallas
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Dallas Floodway System Map
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• 200,000 people work or live behind the levees
• $13.7 billion in real and personal property protected by the levees
Rochester
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1,800 miles of storm
drainage pipes
115 miles of City
owned creeks
48 miles of lined
channels
180 ponds
11,000 outfalls
65,000 inlets
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Interior Drainage
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Flooded Roadway Warning System (FRWS)
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Lamar Underground Lift Station
Flooded Roadway Warning Sign
40 FRWS Locations Citywide
8 Underground lift stations
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Pumping Operations – Supervisory Control and
Data Acquisition (SCADA)
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Total rainfall in 30 days as of June 3, 2015
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June 3, 2015 7:40
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Total Rainfall in 30 days as of August 3, 2015
13August 3, 2015 15:50
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Total rainfall in 30 days as of October 31, 2015
14November 2, 2015 9:35
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Pumping Systems –Spring Event
At peak of event
through Dallas, 33
pumps were operating
Provided opportunity to
thoroughly test/run new
pump stations at Baker
and Pavaho
System functioned as
designed
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Localized Flooding – Spring Event
Elm Fork (California Crossing, Luna, Tantor)
Loop 12/Singleton Area (West Fork Trinity River)
Luna Road/I35/Elm Fork (Luna/Tantor/California Crossing)(Elm Fork Trinity River)
Peavy Road (Dixon Branch up stream of White Rock Lake)
Goforth and Lawther
(White Rock Creek)
Other Street Flooding
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Pumping Systems –October Event
At peak of event
through Dallas, 28
pumps were operating
System functioned as
designed
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System Inspection
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Damage to the system from flooding
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Channel at 3132 Silverton
FRWS damages at various
locations throughout the City
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Repairing Damage to the System
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Removing Blockages
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Successes and Opportunities
System and Emergency Operations Plan activation performed as designed with positive teamwork among all City departments and partners
Limited localized flooding across the City
Continue strengthening internal and external partnerships
Continue addressing aging infrastructure and technology
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Future Funding Needs Funding Needs - Modified Dallas Floodway Project,
subject to federal appropriations process, but can be
advanced by City at 100% City cost as a future work-
in-kind credit
Trinity Portland Pump Station, Operations Center and
upgrades, and Delta Station, est. $60 - $70M
Charlie Station Replacement, est. $46M
Hampton Station Improvements, est. $76M
Note: Cost share for flood control projects is 65% federal/35% local;
betterments are 100% local
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Future Funding NeedsFunding Needs - Dallas Floodway Extension Project,
subject to federal appropriations process
Lamar Levee, est. $55-75M
Cadillac Heights Levee, est. $42M
Rochester Levee Extension, est. $28M
Note: cost share for flood control projects is 75% federal/25% local
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Future Funding NeedsFunding Needs – Various locations across City
Examples include Elm Fork (est. $150M), Dixon Branch (est. $100M), West Joe’s Creek (est. $25M),
West Dallas Eagle Ford Sump Basin (est. $6M)
Westmoreland-Hampton Sump Basin (est. $2.5M)
Prairie Creek Bridge at Dowdy Ferry (est. $15M)
Examples include ongoing erosion control projects along various public creeks (current needs inventory $1B)
Examples include voluntary buyouts of repetitive flood loss properties (current needs inventory $12M)
Note: Some projects may be eligible for grant and other funding sources, but resources are limited to US Army Corps of Engineers
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US Army Corps of
Engineers
Partner Information
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US Army Corps of Engineers
Partner Information
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Top of
Inactive Pool
RESERVOIR ALLOCATIONSTop of Dam
Maximum Design Surface
Top of Flood Control
Top of Conservation
Spillway
Crest
Sedimentation Pool
Freeboard
Surcharge
Streambed
Water Supply, • Municipal
• Agricultural
• Industrial
• Hydropower
Fish & Wildlife, RecreationSpillway Crest
Low Flow
Perched Reserve Power Pool
8.8 million ac-ft5.8 ac-ft water supply20-25% surface water supply
15.9 million ac-ft$2-3 billion/yr damages prevented, $76 billion total
SWF - 214 GWH/yr @ 5 locations
West Fork
Trinity
TRWD
and
Whitney
50%
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What Do You See?
• Flood control system• $70+ billion benefits
• $2-3 billion benefits per year
• Water supply system• 6.8 million served
• Cost < $2.5 billion
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Inundation Products for Surcharge Releases
GIS Shapefiles Google Earth Files PDF Map Books in DFW
Apartment Complex
on Sandy Lake Rd
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Total Rainfall for May-June 2015
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May – June 2015 Event Ended 2014 in significant drought
TRWD projects on West Fork 10+ ft. low
20” – 30” rainfall across entire upper Trinity River
2.3 million ac-ft of flood storage occupied, enough water to
cover Dallas and Tarrant county in 2’ of water
Surcharge operations at 10 reservoirs (Neches/Trinity/Brazos)
Damage inducing surcharge releases at Lewisville, Grapevine
and Lavon
Sequential events with little opportunity to make releases
Dam safety personnel engaged at all projects with high pools
(24/7)
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Damages Prevented Red River Basin
Neches River Basin
Trinity River Basin
Brazos River Basin
Guadalupe River Basin
Colorado River Basin
Total
$5.2 million
$99.7 million
$6.7 billion
$173.5 million
$59.9 million
$23.7 million
$7.1 billion
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