Modeling to Support Green Infrastructure Planning Best Management Practice-Decision Support System (BMP-DSS) Application Andrew Parker Director, Water.

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Presentation transcript:

Modeling to Support Green Infrastructure Planning Best Management Practice-Decision Support System (BMP-DSS) Application Andrew Parker Director, Water Resources Group

► 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 ( BMP-DSS Model

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

Analysis ► Long-term ► Weekly ► Multi-storm

► GIS Integration In the works… ► BMP Optimization

Water Conservation/Recycling Techniques Integrate in-home and on-site water management to better manage storm water runoff at the site scale Case Study

Bowie, Maryland, U.S.A. Developing area Lot size is approx acres 26 % imperviousness (rooftop & paved area) Pervious area (bare ground & gravel filled area) Study Area

Approach ► Generate surface hydrology input using watershed model (LSPC – part of SuMiT) ► Run existing condition (A) ► Run pre-development (O) ► Run scenarios RT – Rooftop RG – Rain Garden PA – Pavement LF – Leach Field RG – Natural Ground

 Potable water from well  Rooftop and paved area are part of runoff  Septic system disposes of household waste Existing Condition (A)

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)

ALTERNATIVES CONSIDERED -Rooftop runoff diverted to cistern, overflow to rain garden -Recycled water is used for flushing -Pavement runoff to rain garden Scenario C

Estimated Benefits 33% Runoff Reduction 27% Reduction in use of potable water Values in 1,000 cubic feet Scenario C

Annual Water Balance Water Balance

Storm Event Analysis Storm Response

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

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