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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

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IH-10 (TXDOT)

Houston Community College

Detention

Ru

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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

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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

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IH-10 (TXDOT)

Houston Community College

Detention

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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