5/25/2017. Lumpkin Detention Basin Houston, Texas By Brian Whitney, P.E., CFM Victor Rendon. Lumpkin Basin. Lumpkin Road Overall Description
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1 Lumpkin Detention Basin Houston, Texas By Brian Whitney, P.E., CFM Victor Rendon TEXAS FLOODPLAIN MANAGEMENT ASSOCIATION April 27, 2017 PROJECT LOCATION PROJECT VICINITY MAP Lumpkin Road Overall Description PROJECT LIMITS Lumpkin : +/- 3,600 LF Adjacent Development College (HCC) Commercial Industrial Residential LUMPKIN BASIN HCC Rummel Creek SPRING LEA / SHADOW OAKS SUBDIVISION W PROJECT LIMITS 1
2 Lumpkin Rd Rummel Creek 5/25/2017 PROJECT BACKGROUND & OBJECTIVES 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 Engineering Phase Project Area Overview Lumpkin Road Detention Westview Houston Community College IH-10 (TXDOT) 2
3 7 x4 Lumpkin Road 5/25/2017 EXISTING SYSTEM YR SHEET FLOW PONDING MAP Lumpkin Road HCC IH-10 HOME DEPOT Existing Conditions Existing 16.1 Ac-Ft (Site 3.33 acres) Off-line Basin RCP - Connection 15 to 25 Maintenance Berm Approx depth 12 North 36 Westview Road 7 x6 30 Restrictor Narrow 120-ft Zone at Outlet (limits depth) Existing Conditions Limited by 36 inflow/outflow pipe Limited access made maintenance difficult 3
4 Lumpkin Rd Rummel Creek 5/25/2017 Lumpkin Road Detention Westview Houston Community College IH-10 (TXDOT) Existing Drainage Conditions ILLUSTRATION OF EXISTING DRAINAGE CONDITIONS (NTS): North TxDOT I-10 WB Frontage Rd Lumpkin Road (open ditch) Existing 48 & 36 Water transmission line Westview Dr. TxDOT 2-10 x10 RCB HCFCD W Rummel Creek 60 Outfall to Parking Lot To TxDOT Existing Westview Dr. Detention Basin (12-ft deep) ILLUSTRATION OF PROPOSEDDRAINAGE CONDITIONS (NTS): Proposed Drainage Conditions No Impact TxDOT I-10 WB Frontage Rd Prop. Lumpkin Road Curb and Gutter Raised 48 & 36 Water transmission line To allow deeper storm sewer Westview Dr. TxDOT Dual 10 x10 RCB 2~24 Restrictor pipes to maintain existing peak flow to TxDOT 7-ft Deeper Westview Dr. Detention Basin Maintain Existing with 36 Restrictor 60 Outfall (restricted) 4
5 PROPOSED CONDITIONS YR SHEET FLOW Lumpkin Road IH-10 HCC Proposed Improvements Matched 100-yr Peak Reduced 10-yr Reduced total volume to TxDOT ROW by 19.5 ac-ft (100-yr) Proposed Improvements Overflow zone Lowered +/- 7 FT Total 26.5 Ac-Ft 24 to 30 Maintenance Berm 20 deep (max) 5
6 Proposed Improvements 120-ft Width 60-ft Width 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 Proposed Improvements All Weather Concrete Vehicular Access Ramp Both Levels Reduced Berm SAFETY ENHANCEMENTS Curbs Perimeter Fence 6
7 Construction Phase 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 7
8 Temporary Access Ramp Rock filter Dam 36 outlet Inflow from Lumpkin Rd existing storm sewer Dewatering after storm events Temporary access ramp 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 48-inch Water Line Installation Water Line Relocation 8
9 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 9
10 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 10
11 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 11
12 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 TxDOT headwall 9 X 5-foot Inlet RCB 36 RCP Outlet Pipe 12
13 Safety Enhancements Pedestrian Guard Rail System 18 X 48 Circular foundations 8 Top Soil Placement 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 Backflow interceptor outfall in wall 8-foot wide concrete pilot channel Slope paving for overflow areas Concrete Vehicular Access ramp 13
14 Overall Project Overview Tax Day Flooding April 18, 2016 Houston Texas Before the Tax Day event 14
15 During the Tax Day Rain Event Peak Water at predicted 100-yr WSEL Upstream of detention basin. Limited Street Ponding Water at Spillway / access driveway along Westview Drive 15
16 Off-site inflow From west side of basin Lumpkin Road looking south Street Flooding from surcharged IH-10 Westbound Frontage Road No structural flooding to adjacent buildings. Downstream flooding Looking west towards Sam Houston Tollroad connection 2-10 x10 that is Rummel Creek along IH-10 Frontage Road 16
17 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 17
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