LID IN REGION 6 HOUSTON AREA FOCUS. Steve Albert, P.E., CFM Senior Project Manager Sherwood Design Engineers

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1 LOW IMPACT DEVELOPMENT Introduction Robert Adair, HLWSF The Harris County Story Alisa Max, PE, Harris County PID Nick Russo, Harris County PID Justin Taack, TCEQ Houston Area Focus Charlie Penland, PE, LEED AP, Walter P Moore & Associates Margaret Robinson, PLA, ASLA, LEED AP, Asakura Robinson Steve Albert, PE, CFM, Sherwood Design Engineers Introduction Robert Adair, HLWSF San Antonio Karen Bishop, San Antonio River Authority Tiffany Price, Bender Wells & Clark Austin Andy Johnston, PE, CFM, CPESC, Halff & Associates Dallas-Fort Worth Mikel Wilkins, PE, ISI ENV-SP, Verdunity Oklahoma Zach Roach, Ideal Homes LID O&M Considerations: Policy and Practicality David Batts, Construction EcoServices LID IN REGION 6 HOUSTON AREA FOCUS Senior Project Manager Sherwood Design Engineers Introduction Robert Adair, HLWSF Arkansas Becky Roark, Illinois River Watershed Partnership Louisiana Dana Brown, PLA, ASLA, LEED AP, CSI, AICP, Dana Brown Associates New Mexico George Radnovich, ASLA, Sites Southwest

2 EPA Region 6 MS4 Stormwater Conference Steve Albert Senior Project Manager salbert@sherwoodengineers.com Fort Worth, Texas July 29 th, 2014

3 Low Impact Development Application AFG Parking Lot Renovation Before After 12,400 SF Building 12,400 SF Building Bio-Swale Downspouts Bio-Swale / Rain Garden Outlet Drain (Surface Overflow) 41,200 Sq. Ft. Concrete Surface Rain Tank Bio-Swale Time of Concentration 3 Minutes 1.2 Acre Roof and Parking Lot Runoff Flows Over Pavement Directly to Outlet Drain Time of Concentraton 15 Minutes Roof Drains to Bio-Swale/Rain Garden Pavement Drains to Bio-Swale Water Treatment Path = 420

4 AFG Parking Lot Renovation Before Construction Concrete Pavement Moves Water Fast But Puddles Remain

5 AFG Parking Lot Renovation Rain Tank Installation 2-3 Hardwood Mulch 8-12 Engineered Soil 4-6 Pea Gravel Fabric Mesh Rain Tank Tank Modules: 5 x 7 x 3 High = 105 Total Modules Plan View of Rain Tank in Swale

6 AFG Parking Lot Renovation Rain Tank Under Bio-Swale 1.5 Deep Section Bio-Swale 1.5 Engineered Fill 1.5 Rain Tank 4.2 Section - Engineered Fill and Rain Tank Engineered Fill and Rain Tank at Low Point of Bio-Swale

7 AFG Parking Lot Renovation Immediately After Construction Parking Lot Runoff Enters Swale at Curb Openings Continuous Rock Channel Along 400 Flow Path

8 AFG Parking Lot Renovation How it Works in a Rain Event

9 AFG Parking Lot Renovation Hydrologic Results and Benefits STORMWATER RUNOFF REDUCTIONS LID Design Storm: 2-Year, 15 Min. (1.1 In.) Peak Flow Rate Reduction 97% Total Runoff Reduction 17% Extreme Short Storm: 100-Year, 15 Min. Peak Flow Rate Reduction 90% Total Runoff Reduction 16% Long Duration Pond Storm: 2-Yr., 24 Hr. Peak Flow Rate Reduction 53% Total Runoff Reduction 13% Extreme Pond Design Storm: 100-Yr., 24 Hr. Peak Flow Rate Reduction 27% Total Runoff Reduction 7%

10 AFG Parking Lot Renovation Focal Point Soil Infiltration Testing Low Point Over Rain Tank After 0.64 Rain in < 1 Hour Drains in a Few Hours Infiltration Testing Verified Soil Conductivity Engineered Fill Rate of Flow > 60 In./Hr. Hydraulic Conductivity Test Device

11 AFG Parking Lot Renovation Appearance Two Years Later Rain Tank Under Grasses

12 Maple Court Subdivision Redevelopment Bellaire, TX Each Front Yard Rain Garden Holds 1 of Runoff Focal Point Filter 4 x 4 Overflow Maple Court Roadway Basin Connecting Pipe Outfall

13 Bellaire, TX Subdivision Redevelopment Basin Excavation Roadway Basin Lot Basins

14 Bellaire, TX Subdivision Redevelopment Rain Tanks and Rock Fill Hi! Junction of Connecting Pipe With Rain Tank

15 Bellaire, TX Subdivision Redevelopment Rock Fill and Fabric Wrap

16 Bellaire, TX Subdivision Redevelopment Preliminary Grading of Surface Ponds Roadway Basin Lot Basins Home Builder Completes Surface Pond Grading Using Any Shape to Hold the Required Volume

17 Stonebrook Subdivision Development Harris County, TX Overflow For All Ponds Outfall High Performance Filter

18 Harris County, TX Subdivision Development Bio-Swale and Filter Excavation Bio-Swale Excavation Filter Excavation 2.5 High Performance Bio-Filter

19 Harris County, TX Subdivision Development Bio-Swale Initial Stabilization

20 LID Infiltration Application Schlumberger Midland Office Building 8 Infiltration Island Bio-Swales 2 Infiltration Channel Bio-Swales 2 Infiltration Ponds Interconnected Site Overflow to I-20 Only When Greater Than a 10 Year Storm

21 LID Infiltration Application Soil Infiltration Data Site AfB 0.6 to 2.0 Inch/Hour Rate of Infiltration Type B Soil

22 LID Infiltration Application Cost Comparison to Traditional Design Onsite Storm Sewer System 1,200 Ft. Pipe Structures Low Impact Development System = $70,000 Traditional Piped Drainage System = $85,000 (Or Much Greater if More Inlets Used )

23 LID Infiltration Application Visual Comparison to Traditional Design Rendering by Project Lead English + Associates Architects Post-Construction Photo

24 LID Infiltration Application Infiltration Trench Detail Basin Oz. Non-Woven Fabric 2-4 Recycled Concrete Infiltration Trench Bottom Completed Pavement Edge At Channel Bio-Swale

25 LID Infiltration Application Laboratory Percolation Test Results Lab Sample Result: Infiltration Rate = Inches/Hour < 1% of NRCS Value!

26 LID Infiltration Application Field Bio-Swale Infiltration Test Infiltration Test Data Sept. 11, 2013 Average 2 / Hour Confirms Design! Hi-Tech Measuring Device

27 LID Infiltration Application Infiltration / Bio-Swale Island Construction Infiltration Trench Construction Curb Openings

28 LID Infiltration Application Infiltration / Bio-Swale Channel Construction Silt Problems Infiltration Trench Construction

29 LID Infiltration Application Infiltration / Bio-Swale Islands Completed Completed Island Island Group

30 Schlumberger Midland Office Building Infiltration / Bio-Swale Channel Completion And, It Works! System Functioned Better Than Expected for Several Large Rain Events Both During and After Construction

31 LID Infiltration Application Infiltration Pond Completion Interconnected Infiltration Ponds

32 Low Impact Development It Can Be The Easier Way We Have Design Options Easier Requires A Longer Run

33 Low Impact Development Making it Work for Owners and Developers Owners/Developers Will Adopt LID Design if it is Cost-Effective Reduced capital costs for sewers, streets, detention, and maintenance offset increased engineering and landscaping costs LID Incentives in Jurisdictions (including Harris County, TX) Increases Value All Development Sites Benefit from Easy to Apply Methods

34 Questions? Contact Information:

LID IN REGION 6 HARRIS COUNTY STORY. Alisa Max, PE Manager, Watershed Protection Group Harris County Public Infrastructure Dept.

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