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Development and Application of a Web- 
Based Post-Construction Stormwater 
www.ContechES.com 
BMP Feasibility Screening To...
www.ContechES.com
www.ContechES.com
www.ContechES.com
www.ContechES.com 
LID is Sweeping the Nation!!! 
Photo credits: SvR Design Company, Seattle, WA
LID implementation doesn’t have to be this 
be complicated! 
www.ContechES.com
www.ContechES.com 
LID Design Hierarchy
www.ContechES.com 
LID Site Planner – Purpose 
 A fast, easy to use tool that follows a Low Impact Development 
(LID) des...
LID Site Planner – Core Functionality 
www.ContechES.com 
 Collect site information 
o Project name, project location, to...
www.ContechES.com 
BMPs represented 
Dominant Unit Process BMP 
INFILTRATION Bioretention 
INFILTRATION Permeable pavement...
Land surface type drives BMP selection 
Considering LEED benefits and O&M concerns, Rainwater 
Harvesting and Green Roof ...
BMP Feasibility Criteria Sources 
 Orange County - 2011 Technical Guidance Document 
 Ventura County – 2011 Technical Gu...
Site Constraint Screening 
Unit Process INFILTRATION HARVEST ET FILTRATION SETTLING 
www.ContechES.com 
Unit Operation Bio...
www.ContechES.com 
Infiltration System Constraints 
 Seasonal high groundwater within 
5’ to 10’ of surface 
 Sensitive ...
www.ContechES.com 
Bioretention 
A stormwater control measure that 
is comprised of plants and 
engineered soil located in...
www.ContechES.com 
Permeable Pavement 
Permeable hardscape materials 
including asphalt, concrete and 
paver block systems...
Infiltration Gallery 
Infiltration trenches and galleries store stormwater below grade in a stone matrix and/or a 
perfora...
www.ContechES.com 
Dry Well 
A vertical stormwater injection well 
used to access permeable soil 
layers at some depth bel...
www.ContechES.com 
Rainwater Harvesting 
Capture of stormwater runoff from 
roofs, streets and other impervious 
areas for...
www.ContechES.com 
Green Roof 
A green roof intercepts and stores 
rainwater within vegetation and a 
growing medium locat...
www.ContechES.com 
Conventional Biofilter 
A stormwater control measure that 
filters stormwater as it passes 
through pla...
www.ContechES.com 
High Rate Biofilter 
High rate biofiltration systems are 
typically <1/20th the size of 
conventional b...
www.ContechES.com 
Media Filter 
Media filters use a bed of 
engineered media without 
vegetation to filter stormwater pri...
www.ContechES.com 
Swale 
A swale is a long linear vegetated 
ditch designed to provide a 
residence time of at least 7-10...
www.ContechES.com 
Hydrodynamic 
Separator 
Hydrodynamic separators are flow 
through treatment systems using 
internal ba...
Confidentiality 
 Users can save and retrieve an unlimited number of their own 
www.ContechES.com 
projects 
 Users cann...
www.ContechES.com 
Demonstration 
• This is a Preliminary screening tool 
• Precursor to detailed stormwater 
management p...
www.ContechES.com 
Demonstration
www.ContechES.com 
Demonstration
www.ContechES.com 
Demonstration
www.ContechES.com 
Demonstration
www.ContechES.com 
Demonstration
www.ContechES.com 
Report Contains: 
 Project information 
 Contact information 
 DMA information 
 Selected BMP(s) 
D...
www.ContechES.com
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Low Impact Developement Site Planner

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The Low Impact Development Site Planner is a web hosted tool that enables the use to quickly assess the feasibility of specific stormwater mitigation approaches including green infrastructure and conventional treatment systems. This presentation describes the architecture of the program and demonstrates its use on a typical project.

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Low Impact Developement Site Planner

  1. 1. Development and Application of a Web- Based Post-Construction Stormwater www.ContechES.com BMP Feasibility Screening Tool Vaikko Allen, CPSWQ, LEED-AP Director Stormwater Regulatory Management Contech Engineered Solutions vallen@conteches.com
  2. 2. www.ContechES.com
  3. 3. www.ContechES.com
  4. 4. www.ContechES.com
  5. 5. www.ContechES.com LID is Sweeping the Nation!!! Photo credits: SvR Design Company, Seattle, WA
  6. 6. LID implementation doesn’t have to be this be complicated! www.ContechES.com
  7. 7. www.ContechES.com LID Design Hierarchy
  8. 8. www.ContechES.com LID Site Planner – Purpose  A fast, easy to use tool that follows a Low Impact Development (LID) design approach and is consistent with regulations that prioritize Green Infrastructure  Helps minimize the cost and delay of redesigns by prompting users to consider a wide range of common site constraints early in the design process  Captures specific site conditions precluding the use of infeasible BMPs  Allows flexibility to select flow through treatment controls where runoff reduction is not feasible  Provides a summary report with links to design guides, standard details and specifications for stormwater management approaches that are likely to be feasible and approved on the project
  9. 9. LID Site Planner – Core Functionality www.ContechES.com  Collect site information o Project name, project location, total disturbed area, total project area, dominant land use  Divide site into discrete drainage management areas (DMA) with dominant land surface types  Apply screening questions to identify feasible BMPs for each DMA  Capture and report constraints precluding more favorable BMPs  Summarize feasible BMPs and provide links to standard specifications and typical drawings
  10. 10. www.ContechES.com BMPs represented Dominant Unit Process BMP INFILTRATION Bioretention INFILTRATION Permeable pavement INFILTRATION Infiltration trench or gallery INFILTRATION Drywell RAINWATER HARVEST Rainwater Harvest EVAPOTRANSPIRATION Green Roofs FILTRATION Conventional Biofiltration FILTRATION High Rate Biofiltration FILTRATION Media Filter GRAVITATIONAL SEPARATION Swale GRAVITATIONAL SEPARATION Hydrodynamic Separator
  11. 11. Land surface type drives BMP selection Considering LEED benefits and O&M concerns, Rainwater Harvesting and Green Roof priority may be reversed www.ContechES.com BMP Selection Based on Land Surface Type Unit Process INFILTRATION HARVEST ET FILTRATION SETTLING Unit Operation Bioretention Permeable pavement Infiltration trench or gallery Drywell Rainwater Harvest Green Roofs Biofiltration High Rate Biofiltration Media Filter Swale Separator Roofs X X X X X X X X X Primary Roads, High Use Parking Lots X P P P X X X X X Landscaped areas X X Walkways, courtyards X X X P P X X X X X Secondary roads, parking lots X X P P P X X X X X Notes: X = Suitable BMP P = Pretreatment required
  12. 12. BMP Feasibility Criteria Sources  Orange County - 2011 Technical Guidance Document  Ventura County – 2011 Technical Guidance Manual  Delaware article 3.06.2 – Post construction BMP standards www.ContechES.com and specifications  2009 MD Stormwater Design Manual, Chapter 3 - Performance criteria for urban BMP design  2012 Stormwater Management Manual for Western Washington  WEF MOP 23 – Design of Urban Stormwater Controls
  13. 13. Site Constraint Screening Unit Process INFILTRATION HARVEST ET FILTRATION SETTLING www.ContechES.com Unit Operation Bioretention Permeable pavement Infiltration gallery Drywell Rainwater Harvest Green Roofs Biofiltration HR Biofilter Filter Swale Separator High Groundwater within 5-10' of surface Sensitive Groundwater, <100' to extraction well Expansive Soils Contaminated soils Low permeability soils (<0.5"/hr infiltration rate) Lack of control over soil compaction during construction Adjacent to foundations and utilities High spill potential PT PT PT PT PT PT PT PT Slopes >5% Potable water demand minimization Xeri Xeri Xeri Fertilizer, pesticide, herbicide minimization O O O O < 4% of EIA available for BMPs Discharge to surface required (no stormdrain) Existing plumbing or structure not supporting green roof Existing plumbing not supporting harvest Insufficient supply or demand for harvested water Maintenance equipment, access and expertise availability Ecological or geomorphic water balance sensitivity Notes: PT = Requires pretreatment Xeri = Xeriscaping or using drought tolerant vegetation O = Organic landscaping with native or adapted plants can minimize impacts
  14. 14. www.ContechES.com Infiltration System Constraints  Seasonal high groundwater within 5’ to 10’ of surface  Sensitive groundwater, groundwater extraction well within 100‘  Expansive soils  Contaminated soils or groundwater  Potential BMP location adjacent to foundation or utilities that may be compromised by infiltration  Low permeability soils <0.5 “/hr infiltration rate or NRCS class C, D This photo shows one of the houses damaged by the 2005 Laguna Beach Landslide. The house experienced an undermining by the landslide but remained intact. Photo by Pam Irvine, California Geological Survey (CGS).
  15. 15. www.ContechES.com Bioretention A stormwater control measure that is comprised of plants and engineered soil located in a landscape depression. The plants and soil cleanse stormwater and retain pollutants and stormwater is infiltrated into native soils. Conventional bioretention system size is dictated by the permeability of native soils and is commonly >10% of the size of the contributing impervious area.
  16. 16. www.ContechES.com Permeable Pavement Permeable hardscape materials including asphalt, concrete and paver block systems allow the movement of water and air around or through the paving material while providing a durable surface for pedestrian, bicycle and vehicular traffic. Infeasibility criteria • High spill potential • Heavy sediment and gross solids loads • High traffic roads and parking lots • Not available to treat roof runoff
  17. 17. Infiltration Gallery Infiltration trenches and galleries store stormwater below grade in a stone matrix and/or a perforated pipe, chamber or vault shaped vessel designed to release stormwater into native soils over time. Pretreatment Required www.ContechES.com
  18. 18. www.ContechES.com Dry Well A vertical stormwater injection well used to access permeable soil layers at some depth below the surface. Pretreatment Required
  19. 19. www.ContechES.com Rainwater Harvesting Capture of stormwater runoff from roofs, streets and other impervious areas for beneficial use as irrigation or for other non-potable indoor and outdoor uses. Feasibility constraints: • Rainwater harvest and use is limited or prohibited due to water rights conflicts • Local building code or public health restrictions prohibit rainwater harvest and use • Inadequate demand for harvested water considering all allowed uses including, irrigation, indoor non-potable use, cooling water makeup, etc.
  20. 20. www.ContechES.com Green Roof A green roof intercepts and stores rainwater within vegetation and a growing medium located on a roof surface. Only applicable where land surface type is “Roof”. Feasibility Constraints: • Existing roof will not support additional weight of green roof (Extensive roof up to 50# wet, Intensive roof up to 150# wet) • Green roof would require supplemental irrigation in Arid (<10"/annual precip) or Semi-arid Climate (10-20" annual precip)
  21. 21. www.ContechES.com Conventional Biofilter A stormwater control measure that filters stormwater as it passes through plants and engineered. Biofiltration may allow incidental infiltration it differs from bioretention in that it contains an under drain which collects treated stormwater and discharges it from the site. Conventional biofiltration sizing is typically greater than 4% of the contributing impervious area. Constraints: • High spill potential requires pretreatment • >4% of contributing effective impervious area required • Site must be tolerant of vegetation and wildlife
  22. 22. www.ContechES.com High Rate Biofilter High rate biofiltration systems are typically <1/20th the size of conventional biofiltration due to the use of optimized soils that have sustained infiltration rates of more than 50”/hr. They may also be configured to allow incidental infiltration. Constraints: • Require 3’ minimum drop from grade to outlet invert • Site must be tolerant of vegetation and wildlife • Susceptible to spills and heavy sediment and gross solids loading
  23. 23. www.ContechES.com Media Filter Media filters use a bed of engineered media without vegetation to filter stormwater prior to discharge downstream. They are commonly installed below grade. Constraints: • Regulatory approval as stand alone BMP required unless used as pretreatment • Require 3’ minimum drop from grade to outlet invert
  24. 24. www.ContechES.com Swale A swale is a long linear vegetated ditch designed to provide a residence time of at least 7-10 minutes for stormwater runoff. Pollutants settle out and are filtered as they travel the length of the swale. Swales typically provide significant volume reduction through incidental infiltration and evapotranspiration. Constraints: • Susceptible to spills and heavy sediment and gross solids loading • Long linear space required (100 ft min)
  25. 25. www.ContechES.com Hydrodynamic Separator Hydrodynamic separators are flow through treatment systems using internal baffles, weirs, plates and other flow directing features to optimize removal of floating and sinking pollutants. Most commonly used as pretreatment in an LID application. Constraints: • Typically a pretreatment BMP • Regulatory approval as stand alone treatment not assured • Require 3’ minimum drop from grade to outlet invert • Not able to address dissolved pollutants
  26. 26. Confidentiality  Users can save and retrieve an unlimited number of their own www.ContechES.com projects  Users cannot view others projects  Basic login information auto-populated on new projects  Contech support is available on request o Where assistance is requested, questions directed to a local resource based on project zip code or user information  If requested, Contech can review project details and can assist with feasibility screening and stormwater plan development
  27. 27. www.ContechES.com Demonstration • This is a Preliminary screening tool • Precursor to detailed stormwater management plans • Local criteria supersede default criteria
  28. 28. www.ContechES.com Demonstration
  29. 29. www.ContechES.com Demonstration
  30. 30. www.ContechES.com Demonstration
  31. 31. www.ContechES.com Demonstration
  32. 32. www.ContechES.com Demonstration
  33. 33. www.ContechES.com Report Contains:  Project information  Contact information  DMA information  Selected BMP(s) DMA Report ◦ Description ◦ Web link to specifications, drawings, design information  Non-selected feasible BMPs ◦ Description  Infeasible BMPs ◦ Reasons for infeasibility
  34. 34. www.ContechES.com
  • Mfu910

    Jan. 13, 2015

The Low Impact Development Site Planner is a web hosted tool that enables the use to quickly assess the feasibility of specific stormwater mitigation approaches including green infrastructure and conventional treatment systems. This presentation describes the architecture of the program and demonstrates its use on a typical project.

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