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

2. ► 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)www.modelingwater.com BMP-DSS Model

3. 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

4. Analysis ► Long-term ► Weekly ► Multi-storm

5. ► GIS Integration In the works… ► BMP Optimization

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

7. 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

8. 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

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

10. 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)

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

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

13. Annual Water Balance Water Balance

14. Storm Event Analysis Storm Response

15. 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

16. Thank You! For more information, visit: www.modelingwater.com