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Lumpkin Detention BasinHouston, Texas
By Brian Whitney, P.E., CFM
Victor Rendon
TEXAS FLOODPLAIN MANAGEMENT
ASSOCIATION
April 27, 2017
Lumpkin Basin
PROJECT VICINITY
MAP
PROJECT LOCATION
Lumpkin Road Overall Description
PROJECT LIMITS
• Lumpkin : +/-3,600 LF
• Adjacent Development
• College (HCC)
• Commercial
• Industrial
• Residential
PROJECT LIMITS
LUMPKIN BASIN
HCC
W156-00-00
SPRING LEA / SHADOW OAKSSUBDIVISION
Rummel Creek
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Lumpkin Road Overall Description
• Improve Drainage Deficiencies
• Reduce Flooding in Spring Lea /Shadow Oaks Neighborhood (North)
• Improve Safety and Mobility – Additional Traffic Lanes
• Pedestrian Access – For Houston Community College (HCC)
• Upgrade Traffic Components
• Replace Aging Water and Sewer Utilities
PROJECT BACKGROUND & OBJECTIVES
Lumpkin Basin
Engineering Phase
Lumpkin Road
Project Area Overview
Lum
pki
n R
d
IH-10 (TXDOT)
Houston Community College
Detention
Ru
mm
el C
ree
k
Westview
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Lumpkin Road EXISTING SYSTEM - 100 YR SHEET FLOW PONDING MAP
HCC
HOME DEPOT
IH-10
Lumpkin Basin Existing Conditions
• Existing 16.1 Ac-Ft (Site 3.33 – acres)
• Off-line Basin - 36”-RCP - Connection
• 15 to 25’ Maintenance Berm
• Approx depth 12’
7’x
4’
36”
7’x6’
30” Restrictor
Westview Road
North
Lum
pki
n R
oad
Lumpkin Basin Existing Conditions
• Narrow 120-ft Zone at Outlet (limits depth)
• Limited by 36” inflow/outflow pipe
• Limited access made maintenance difficult
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Lumpkin Road
Lum
pki
n R
d
IH-10 (TXDOT)
Houston Community College
Detention
Ru
mm
el C
ree
k
Westview
ILLUSTRATION OF EXISTING DRAINAGE CONDITIONS (NTS):
Westview Dr.Lumpkin Road
(open ditch)
TxDOT
2-10’x10’ RCB
HCFCD W156-00-00
Rummel Creek
TxDOT I-10
WB
Frontage Rd
60” Outfall to
Parking Lot
To TxDOT
Existing Westview Dr.
Detention Basin (12-ft deep)
Existing 48” & 36” Water
transmission line
Existing Drainage Conditions
North
ILLUSTRATION OF PROPOSED DRAINAGE CONDITIONS (NTS):
Westview Dr.
Prop. Lumpkin Road
Curb and Gutter
TxDOT Dual
10’x10’ RCB
No Impact
TxDOT I-10 WB
Frontage Rd
Maintain Existing
60” Outfall (restricted)
7-ft Deeper Westview Dr.
Detention Basin
with 36” Restrictor2~24” Restrictor pipes
to maintain existing
peak flow to TxDOT
Raised 48” & 36”
Water transmission line
To allow deeper storm
sewer
Proposed Drainage Conditions
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Lumpkin Road PROPOSED CONDITIONS - 100 YR SHEET FLOW
HCC
IH-10
Lumpkin Basin Proposed Improvements
• Matched 100-yr Peak
• Reduced 10-yr
• Reduced total volume to TxDOT ROW by 19.5 ac-ft (100-yr)
Lumpkin Basin Proposed Improvements
• Lowered +/- 7 FT
• Total 26.5 Ac-Ft
• 24 to 30’ Maintenance Berm
• 20’ deep (max)
Overflow zone
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Lumpkin Basin Proposed Improvements
• Modular block gravity wall
• Each block 2,000 – 2,500 lbs
• 6 Different vertical walls zones
• Remove poor existing clay & replace w/ cement stabilized sand base
• Crushed Concrete Drainage Backfill
• 24’ to 30’ Maintenance Berm
120-ft Width
60-ft Width
Lumpkin Basin Proposed Improvements
• All Weather Concrete Vehicular Access Ramp – Both Levels
• Reduced Berm
Lumpkin Basin
SAFETY ENHANCEMENTS
• Curbs • Perimeter Fence
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Lumpkin Basin
Construction Phase
Lumpkin Basin
General Bid Information
• Construction Cost = $3,420,000
• Construction Duration = 9 months
• Excavation & Disposal = 30,000 CY
• Redi-Rock modular system average bid $55 / sq. ft.
• Total for wall system = $1.2 - mil
• Total Area approximately 22,500 SF
• 3,880 Redi-Block
Challenges
• Heavy rain events during the course of construction.
• Dewatering after heavy rain events
• Replacing poor soil with cement stabilized sand bedding
• Temporary shoring up to 22-feet
• Relocating a 36 & 48-in Transmission Water Lines
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Lumpkin Basin
• Inflow from Lumpkin Rd existing storm sewer
• Dewatering after storm events
• Temporary access ramp
Temporary Access Ramp
36” outlet
Rock filter Dam
Water Line Relocation
• Relocation of a 36 & 48-inch transmission Water lines
• City of Houston Low Demand Water Window
• Work around the clock
• Limited time for pipe procurement
Water Line Relocation
48-inch Water Line Installation
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Construction Sequence
• East to West (North Walls)
• East to West (South Walls)
• Backwalls
Construction Sequence
• East to West (North Walls)
• East to West (South Walls)
• Backwalls
Construction Sequence
• East to West (North Walls)
• East to West (South Walls)
• Backwalls
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Redi-Rock Installation
• Cement Stabilized Sand Foundation Base
Redi-Rock Installation
• Temporary Trench Safety Protection Prior to Redi-Rock Installation
Redi-Rock Installation
• Redi-Rock System
• Different Types of Blocks sizes
• Works As a Gravity Wall
• Aesthetically Pleasant
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Redi-Rock Installation
• Initial Installation of Granular bedding (North Wall)
Redi-Rock Installation
• Initial Installation of Redi-Rock System (North Wall)
• Geotextile
• 6-inch drain pipe
Redi-Rock Installation
• Granular backfill
• Crushed Concrete Material
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Lumpkin Basin
• On Going Construction
• Curve walls
• 6-inch Drainage Pipe
Redi-Rock Installation
• Reference to scale of walls with equipment
• Varied wall heights
• Protection of Pilot Channel During Top Soil Excavation
Lumpkin Basin
• TxDOT headwall
• 9 X 5-foot Inlet RCB
• 36” RCP Outlet Pipe
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Safety Enhancements
• Pedestrian Guard Rail System
• 18” X 48” Circular foundations
• 8” Top Soil Placement
Lumpkin Basin
• Backflow interceptor outfall in slope paving under Vehicle Access Road
• 8-foot wide pilot channel
• Concrete Slope paving for overflow areas
• Concrete Vehicular Access ramp
• Earthen Slopes at 4:1
Lumpkin Basin
• Backflow interceptor outfall in wall
• 8-foot wide concrete pilot channel
• Slope paving for overflow areas
• Concrete Vehicular Access ramp
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Overall Project Overview
Lumpkin Basin
Tax Day Flooding
April 18, 2016
Houston Texas
Lumpkin Basin
Before the Tax Day event
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Lumpkin Basin
During the Tax
Day Rain Event
Peak Water at predicted 100-yr WSEL
Lumpkin Basin
• Upstream of detention basin.
• Limited Street Ponding
Lumpkin Basin
• Water at Spillway / access driveway along Westview Drive
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Lumpkin Basin
• Off-site inflow
• From west side of basin
Lumpkin Basin
• Lumpkin Road looking south
• Street Flooding from surcharged IH-10 Westbound Frontage Road
• No structural flooding to adjacent buildings.
Lumpkin Basin
• Downstream flooding
• Looking west towards Sam Houston Tollroadconnection
• 2-10’x10’ that is
• Rummel Creek along
• IH-10 Frontage Road
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Conclusion
• Increased detention efficiency from 50% to 93%
• Increased effective storage volume by 15 ac-feet (total system net increase of 20 ac-feet)
• Reduced Flooding in Spring Lea /Shadow Oaks Neighborhood (North)
• Improved Maintenance Access for Basin
• Aesthetic Benefit to the area
Questions & Answers