design permitting of trenchless crossings of usace flood ...€¦ · hdd drilling fluid release...
TRANSCRIPT
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Design, Permitting of Trenchless Crossings in USACE Flood Control Projects
Mark Miller, PE, Principal, GeoEngineers, Inc.David Sauls, PE, Senior Principal, GeoEngineers, Inc.Thomas West, PE, Geotechnical Engineer, USACEMark Woodward, PE, Levee Safety Program Manager, USACE
January 31, 2018
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About USACE Levees FEMA estimated levees located in 22% of nation’s 3,147 counties
Estimated 43% of US population lives in counties with levees
85% of nation’s estimated 100,000 miles of levees locally owned & maintained—reliability unknown
Increased development behind levees = increase in risk to public
Rough estimates >$100 billion to repair & rehabilitate nation’s levees
Water & environment levees 2009 grade = D-
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Overor
Under
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Over the Top of Levee
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Between the Levees
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Under the Levee
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Under the Levee
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Direct Pipe Under the Levee
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Threats to Flood Protection Slope stability & settlement
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Threats to Flood Protection Slope stability
& settlement
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Threats to Flood Protection HDD Drilling fluid release & flow through the annulus
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Know Early First, check routing Avoidance best solution for cost, schedule, risk Longest lead time for permitting Soil conditions control design & construction Meet local USACE District early to discuss levee
concerns Most rigorous construction requirements Most expensive design & construction option
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Permitting ̶ Year or More
Routing Geotechnical Conditions
Construction Dictates
Permitting
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Permitting ̶ Year or More
DesignUSACE District Review
USACE RMC
Review
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Know Soil Conditions Before Route Finalized
Historical Map of Mississippi River Channels
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Over the Top Requirements
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Over the Top Requirements
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HDD Concerns Some soils will not meet USACE requirements against
hydraulic fracture Risk may be reduced with pilot hole intersect Risk of inadvertent returns also depends on contractor
performance Direct Pipe might become option
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Direct Pipe Limitations Diameter & length
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References Hurricane and Storm Damage Reduction System Design Guidelines,
INTERIM, New Orleans District Engineering Division USACE, October 2007. [www.mvn.usace.army.mil/ENG/Page A.asp].
ETL 1110-2-569, Design Guidance for Levee Underseepage USACE, May 2005. [www.usace.army.mil/inet/usace-docs].
“MVD Method of Planes” slope stability software New Orleans District Engineering Division USACE. [www.mvn.usace.army.mil].
EM 1110-2-1913, Design and Construction of Levees, April 2000. [www.usace.army.mil/inet/usace-docs]
EM 1110-2-1901, Seepage Analysis and Control for Dams, April 1993. [www.usace.army.mil/inet/usace-docs]
CPAR-GL-98-1, Installation of Pipeline Beneath Levees using Horizontal Directional Drilling. April 1998.
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Questions? Mark Miller, PE, Principal, GeoEngineers, Inc.
[email protected], 417.799.2623 David Sauls, PE, Senior Principal, GeoEngineers, Inc.
[email protected], 225.603.8980 Thomas West, PE, Geotechnical Engineer, USACE Mark Woodward, PE, Levee Safety Program Manager,
USACE