presented by: timothy w. reed, p.e., cpesc · mega-ditch batter chute, southbridge, ma. corrugated...
TRANSCRIPT
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Building Trust. Engineering Success.
Batter Chute DesignPresented by:
Timothy W. Reed, P.E., CPESCProject Director / CAD Services Manager
Sanborn, Head & Associates, Inc.October 2, 2018
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Experience P.E. – NH, MA, ME CPESC - 2011 Solid waste designer for 20+ years Industrial facility drainage and landfill cell
and closure construction projects
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What is a Batter Chute?A batter chute or “drainage chute” is a steep drainage channel that passes down the face of a slope.
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Natural ConditionIn nature, water finds the path of least resistance.
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EngineeredEngineered batter chutes are typically more uniform and range from concrete-lined dam spillways…
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Engineered… to riprap-lined channels.
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The Power of Water
7Oroville, California dam spillway failure – March 2017
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Landfill Final Cover System Steep slopes (3H:1V) Tall slopes (> 100 feet) Limited area Perimeter roads Detention basins Highly regulated
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Landfill Cap System
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Gabion-Lined Downchute
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Landfill Cap System
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Landfill Cap System
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Anatomy of a Batter Chute
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CHANNEL
INLET(S)
OUTLET1X
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Anatomy of a Batter Chute
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1X
SUBCRITICAL FLOW
SUBCRITICAL FLOW
SUPERCRITICAL FLOW
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Froude Number and Critical Depth
Fr = v/(g hm)1/2
The Froude Number is “the inertia force on an element of fluid to the weight of the fluid element”
v = velocity
g = acceleration of gravity
hm = hydraulic mean depth
hm = A / TT = width of channel open surface
A = cross-sectional area
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Inlet Erosion Protection
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1X
y1
y2TRASITION ZONE IS
POTENTIAL AREA FOR EROSION
SUBCRITICAL FLOW
SUPERCRITICAL FLOW
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SUMP
VAULT
BASIN
DRAINAGE CHUTE
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Channel Erosion Protection
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1X
SUPERCRITICAL FLOW
y2
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Manning’s Equation
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Q = VA = ( )AR2/3S1/2
1.49nV = ( )R2/3S1/2
1.49n
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Channel Geometry
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TRAPEZOIDAL TRIANGULAR
RECTANGULAR PARABOLIC
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Channel Erosion Protection Rock needs to be large and angular to stay
on slope Rock can be secured (gabion or grouted in
place) Alternative armoring system can be used
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Rock-Filled Gabion Baskets
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Corrugated HDPE-Lined Swale
26MEGA-DITCH BATTER CHUTE, SOUTHBRIDGE, MA
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Corrugated HDPE-Lined Swale
27MEGA-DITCH BATTER CHUTE, SOUTHBRIDGE, MA
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Corrugated HDPE-Lined Swale
28MEGA-DITCH BATTER CHUTE, SOUTHBRIDGE, MA
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Geomembrane-Lined Swale
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Centralized Sediment Mgmt.
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Geoweb/Geocell
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Geoweb/Geocell
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Articulated Concrete Block
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ARMORFLEX BY CONTECH
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Grout-Filled Geotextiles
34ARTICULATING BLOCK MATS BY SYNTHETEX
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Outlet Erosion Protection
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1X
SUBCRITICAL FLOW
SUPERCRITICAL FLOW
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Stable Outlet Options
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DROP-INLET HEADWALL
PLUNGE POOLENERGY
DISSIPATER
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Outlet Erosion Protection
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Basin Inlet
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Location of the Hydraulic Jump
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CASE A CASE B
CASE C
VELOCITY HIGH AND DEPTH LOW = JUMP
AWAY FROM TOE
VELOCITY AND DEPTH MATCHES =
JUMP CLOSE TO TOE (OPTIMAL)
VELOCITY HIGH AND DEPTH HIGH = JUMP
OCCURS OVER SLOPE (POTENTIAL
FOR PROBLEMS)
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Hydraulic Above the Channel
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ACTS LIKE A HYDROFOIL (AIRPLANE WING)
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Case C – Resulting in Damage
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Consider Below-Grade Flow
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Size Recess Based on Flow
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SIZE A RECESS TO ENSURE THAT JUMP OCCURS CLOSE TO THE TOE OF SLOPE
Z
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Sizing Guidance
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Additional Design Information
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Catchments & Creeks
https://www.catchmentsandcreeks.com.au/index.html
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Additional Design Information
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Design and Construction of Urban Stormwater Management Systems, ASCE, 1992 Older document >700 pages
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Additional Design Information
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Questions?
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Thank You!
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Building Trust. Engineering Success.
Timothy W. Reed, P.E., CPESCProject Director / CAD Services Manager
Sanborn, Head & Associates, [email protected]
www.sanbornhead.com