Another world is possible! Well, maybe. Simon Parker, Director, NLGN.
Andrew Parker Director, Water Resources Group modelingwater
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Transcript of Andrew Parker Director, Water Resources Group modelingwater
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Modeling to Support Green Infrastructure Planning
Best Management Practice-Decision Support System (BMP-DSS) Application
Andrew Parker
Director, Water Resources Group
www.modelingwater.com
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► Component of Sustainable Modeling Toolbox (SuMiT)
► Developed for detailed site-scale planning
► Evaluate effectiveness of green technologies in a watershed
► Considers hydrology and water quality
► Models Best Management Practices (BMPs)
► Can be applied at watershed scale
► Includes post-processing capabilities
► Available to the public (www.modelingwater.com)
BMP-DSS Model
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BMP Simulation► Two Major BMP Categories
Storage/detention Open channel
► Physical Process Representation Evapotranspiration Infiltration Orifice and underdrain outflow Weir-controlled overflow spillway Bottom slope and roughness influence General loss or decay of pollutant
► Depending on design and type of BMP, any combination of processes may occur during simulation
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Analysis
► Long-term
► Weekly
► Multi-storm
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► GIS Integration
In the works…
► BMP Optimization
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Water Conservation/Recycling Techniques
Integrate in-home and on-site water management to better manage storm water runoff at the site scale
Case Study
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• Bowie, Maryland, U.S.A.• Developing area• Lot size is approx. 1.25
acres• 26 % imperviousness
(rooftop & paved area)• Pervious area (bare
ground & gravel filled area)
Study Area
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Approach
► Generate surface hydrology input using watershed model (LSPC – part of SuMiT)
► Run existing condition (A)
► Run pre-development (O)
► Run scenarios
B RT --> RG, PA --> RGC RT --> Toilet & RG, PA --> RGD RT --> RG --> LF, PA --> RGE RT --> RG --> LF, PA --> NG
Scenarios DescriptionRT – RooftopRG – Rain GardenPA – PavementLF – Leach FieldRG – Natural Ground
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Potable water from well Rooftop and paved area are part of runoff Septic system disposes of household waste
Existing Condition (A)
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Values in 1,000 cubic feet
Potable water from well Rooftop and paved area are part of runoff Septic system disposes of household waste
Existing Condition (A)
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ALTERNATIVES CONSIDEREDALTERNATIVES CONSIDERED
-Rooftop runoff diverted to cistern, overflow to rain garden
-Recycled water is used for flushing-Pavement runoff to rain garden
Scenario C
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Estimated BenefitsEstimated Benefits
33% Runoff Reduction27% Reduction in use of potable water
Values in 1,000 cubic feet
Scenario C
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Annual Water Balance
-
50,000
100,000
150,000
200,000
250,000
Input Scenario 0(Pre-dev)
Scenario A(existing)
Scenario B Scenario C Scenario D Scenario E
Vo
lum
e (f
t3/y
r)
Outflow
ET
Infiltration
Precip
Water Balance
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Storm Event Analysis
Storm Response
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BMP-DSS Summary
► Publicly available tool to support green planning
► Designed for urban areas, but applicable elsewhere
► Can be incorporated into larger scale watershed planning
► Provides quantitative data for engineering design
► Basis of systems developed throughout the U.S.A. for stormwater management and nonpoint source pollution control