David Batts - Building the BMP: Construction Specifications
Storm Water Quality Management Building Non-Structural Best Management Practices David Batts Jr., LEED AP Market Development What We Do ▫ Innovative Permanent Storm Water Quality Solutions ▫ ▫ ▫ ▫ Cost Effective Underground Detention Water Harvesting Solution Treat Entire Flow Eliminate Bacteria Concerns ▫ Permanent Slope and Channel Stabilization ▫ ▫ 99.9% Erosion Control Effectiveness Green Armor in place of concrete ▫ Storm Water Pollution Prevention Solutions ▫ ▫ ▫ Storm Water Pollution Plans Outsourcing Innovative Best Management Practices Compliance Assurance Program for General Contractors Storm Water Quality Management Agenda Importance of Reducing the Impacts of Storm Water Runoff Low Impact Development Introduction Design and Construction Ideas for Non-Structural BMP’s Why LID is Important Property development leads to increased runoff. Collect. Convey. Discharge. Polluted Outfalls Centralized Control. Urban Flooding Storm Water Disposal Severe Erosion Groundwater Loss Conventional Development Centralized Pipe and Pond Control Run-off Hydrograph The high price of efficiency 2001 Tropical Storm Allison 1915 Predevelopment Response What is Low Impact Development? ▫ Low Impact Development (LID) is a storm-water management strategy that decentralized controls and on-site features to closely mimic the pre-developed condition of the site. What’s Attractive About LID? ▫ Universally applicable ▫ arid, clays, karst, cold, coastal, etc. ▫ Economically sustainable ▫ Ecologically sustainable ▫ Silent on growth management ▫ Ideal for new development or urban retrofit ▫ Common sense approach ▫ Pollution prevention ▫ Public acceptance LID Benefits ▫ ▫ ▫ ▫ ▫ ▫ ▫ Reduced infrastructure cost for detention ponds, curbs, gutter, inlets and pipes Increase in commercially viable land Enhanced property values and redevelopment potential Energy and potable water cost savings Enhanced ‘quality of life’ and aesthetics Greater marketability and valuable market positioning edge for owners Ease burden on local development support entities Conventional Site Design LID Design? Multiple Systems LID Development Conservation Minimization Soil Management Open Drainage Rain Gardens Rain Barrels Pollution Prevention Disconnected Decentralized Distributed Multi-functional Run-off Hydrograph Conventional vs. LID 2001 Tropical Storm Allison 1915 Predevelopment Response Efficient Storm Water Design LID Condition Micro Detention ▫ Bio-retention ▫ Rainwater Harvesting ▫ ▫ ▫ ▫ ▫ Bio-swales Rain Gardens Roof Gardens Permeable Paving Planter Boxes Micro Retention Pollutant Removal ▫ ▫ ▫ ▫ ▫ ▫ ▫ TSS - 95% Heavy Metals - 99% Oil and Grease - 95% Total Phosphorous - 80% Total Nitrogen - 40% Coliform - 80% Treat over 90% of total volume in less than 1% of the urban landscape. How LID Affects the Environment ▫ Hydrological Advantages ▫ ▫ ▫ ▫ Increase the Sponge Factor ▫ ▫ ▫ Replicates natural hydrologic cycle Increase groundwater recharge Manage storm water rather than dispose of it Create or restore pre-development runoff numbers Enhance flood resistance Create Opportunities for Storm Water Reuse ▫ New technologies enable LID tools to be used to passively clean and reuse storm water DESIGN & CONSTRUCTION 2000 Maryland Stormwater Design Manual. Vol.I & II www.mde.state.md.us How can we slow down the time of concentration, allow evapotranspiration to take place, and mimic the predevelopment hydrologic cycle? Types of BMP’s Pollutant Removal Types of BMP’s Dry Pond Types of BMP’s Sand Filter Types of BMP’s Bioretention Types of BMP’s Dry Swale Types of BMP’s Dry Swale All green space can be designed to be hydrologically functional and treat runoff. 1: Initial Architect’s Concept Centralized Control Pond 2: Revised Concept Reduced lawn, pulled in fields, redesigned parking area. 3: Low Impact Design Multifunctional Use of Landscape and Infrastructure Outdoor Classroom Student Gardens Decentralized Controls Roofs Parking Lots Open Drainage Rain Barrels Open Space Turf Educational components RESULT: 5 Acres of Trees Saved Retaining Walls Minimize Grading Extensive Use of Native Plants Existing Vegetation Preserved Outdoor Classroom Path to Undeveloped Woods / Stream Rain barrel for watering student garden LID Summary ▫ LID paradigm is storm water management rather than storm water disposal ▫ LID is Simple and Effective ▫ ▫ LID is Economical ▫ ▫ LID strategies integrate green space, native landscaping and natural hydrological functions to mimic nature Costs less than conventional storm water management systems to install and maintain LID is Flexible ▫ LID offers a wide variety of structural and non-structural techniques to reduce runoff speed and volume and improve water quality Visit: www.lowimpactdevelopment.org for more information Massachusetts Institute of Technology Stata Building Infiltration Modules Single Module Double Module Triple Module Size: Size: Size: (W) 16.06” (W) 16.06” (W) 16.06” (L) 26.97” (L) 26.97” (L) 26.97” (H) 17.72” (H) 34.65” (H) 51.57” Volume: 33.031 gallons Volume: 65.085 gallons Volume: 88.135 gallons How Much Water is Stored? How Much Water Do You Need to Store? Commercial WSUD/LID Urban Parking Lot Case Study English + Associates Owner Architect Construction EcoServices Storm-water Tank Contractor General Contractor T&T Construction Case study of an Urban Site Site Specific Problems 1. Existing surface conditions did not mitigate storm water by percolation or retention. 2. Presence of expansive clay soils posed a danger to foundation of the adjacent building. 3. Adjacent historical building has a basement which suffers occasional flooding due to underground hydrostatic pressure. ▫ Parameters ▫ Parking lot with 23 spaces ▫ 100’ x 100’ Lot – 10,000SF ▫ Conditions ▫ Crushed gravel Parking lot ▫ Age: 40-50yrs ▫ Goals ▫ To provide adequate, smooth parking for office ▫ To mitigate storm water run-off ▫ Provide green space ▫ Retain storm water for irrigation 1919 Decatur Parking Lot How we fit it in Design superimposed over original parking lot Î Î Î Î Î Î Î Î Î Î arrows reflect Î Î Design of underground water retention and water inlets Î ATLANTIS RAINTANKS direction of water flow Breaking Ground – Basic Drainage slope Breaking Ground Breaking Ground – Basic Drainage slope Excavation of pit for Rain Tanks Excavation Breaking Ground – Basic Drainage slope Excavation of pit for Rain Tanks A gravel and sand mixture goes on the bottom of the pit as leveling material Sand-Gravel Layer Breaking Ground – Basic Drainage slope Excavation of pit for Rain Tanks A gravel and sand mixture goes on the bottom of the pit as leveling material Atlantis Rain Tanks Ship flat on a truck bed to be assembled onsite. Shipment of Tanks Breaking Ground – Basic Drainage slope Excavation of pit for Rain Tanks A gravel and sand mixture goes on the bottom of the pit as leveling material Atlantis Rain Tanks Ship flat on a truck bed to be assembled onsite. Assembly is timely and simple. Assembly Breaking Ground – Basic Drainage slope Excavation of pit for Rain Tanks A gravel and sand mixture goes on the bottom of the pit as leveling material Atlantis Rain Tanks Ship flat on a truck bed to be assembled onsite. Assembly is timely and simple. A fabric layer to protect the impermeable layer EcoFabric Liner Breaking Ground – Basic Drainage slope Excavation of pit for Rain Tanks A gravel and sand mixture goes on the bottom of the pit as leveling material Atlantis Rain Tanks Ship flat on a truck bed to be assembled onsite. Assembly is timely and simple. Added a fabric layer to protect the impermeable layer An impermeable layer at the side and bottom of the tank to keep the water from seeping into the soil Impermeable Layer Breaking Ground – Basic Drainage slope Excavation of pit for Rain Tanks A gravel and sand mixture goes on the bottom of the pit as leveling material Atlantis Rain Tanks Ship flat on a truck bed to be assembled onsite. Assembly is timely and simple. Added a fabric layer to protect the impermeable layer An impermeable layer at the side and bottom of the tank to keep the water from seeping into the soil. Another layer of the Geotextile fabric. Liner Wrap Breaking Ground – Basic Drainage slope Excavation of pit for Rain Tanks A gravel and sand mixture goes on the bottom of the pit as leveling material Atlantis Rain Tanks Ship flat on a truck bed to be assembled onsite. Assembly is timely and simple. Added a fabric layer to protect the impermeable layer An impermeable layer at the side and bottom of the tank to keep the water from seeping into the soil. Another layer of the Eco fabric. Placement of the Atlantis Rain Tanks Tank Sequence Breaking Ground – Basic Drainage slope Excavation of pit for Rain Tanks A gravel and sand mixture goes on the bottom of the pit as leveling material Atlantis Rain Tanks Ship flat on a truck bed to be assembled onsite. Assembly is timely and simple. Added a fabric layer to protect the impermeable layer An impermeable layer at the side and bottom of the tank to keep the water from seeping into the soil. Another layer of the Eco fabric. Placement of the Atlantis Rain Tanks Sand is compacted 2 feet along the perimeter of the tank. Compacted Sand Breaking Ground – Basic Drainage slope Excavation of pit for Rain Tanks A gravel and sand mixture goes on the bottom of the pit as leveling material Atlantis Rain Tanks Ship flat on a truck bed to be assembled onsite. Assembly is timely and simple. Added a fabric layer to protect the impermeable layer An impermeable layer at the side and bottom of the tank to keep the water from seeping into the soil. Another layer of the Eco fabric. Placement of the Atlantis Rain Tanks Sand is compacted 2 feet along the perimeter of the tank. The D-Cells convey filtered water from gravel beds to tank D-Cells Water Inlet Breaking Ground – Basic Drainage slope Excavation of pit for Rain Tanks A gravel and sand mixture goes on the bottom of the pit as leveling material Atlantis Rain Tanks Ship flat on a truck bed to be assembled onsite. Assembly is timely and simple. Added a fabric layer to protect the impermeable layer An impermeable layer at the side and bottom of the tank to keep the water from seeping into the soil. Another layer of the Eco fabric. Placement of the Atlantis Rain Tanks Sand is compacted 2 feet along the perimeter of the tank. The D-Cells convey filtered water from gravel beds to tank Concrete placement Concrete Placement Breaking Ground – Basic Drainage slope Excavation of pit for Rain Tanks A gravel and sand mixture goes on the bottom of the pit as leveling material Atlantis Rain Tanks Ship flat on a truck bed to be assembled onsite. Assembly is timely and simple. Added a fabric layer to protect the impermeable layer An impermeable layer at the side and bottom of the tank to keep the water from seeping into the soil. Another layer of the Eco fabric. Placement of the Atlantis Rain Tanks Sand is compacted 2 feet along the perimeter of the tank. The D-Cells convey filtered water from gravel beds to tank Concrete placement Completed Pavement After Before COST COMPARISON Total Conventional Development ($) Low Impact Development ($) 41,500 33,000 We Are Storm Water Quality Specialists We can help you deal with storm water quality challenges www.ecosvs.com 832.456.1000
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