1. Integrating Simulation and Design for Stormwater Management by Alan A. Smith Alan A. Smith Inc. Dundas, Ontario, Canada

2. A SWMM Program Classification Scheme

3. Representing a Drainage Network as a Tree 11 Nodes 10 Links

4. A node numbering convention

5. A time-wise marching solution Upstream boundary Q = Q(t) Downstream boundary H = f(Q,t) Intermediate inflow  Q(j)

6. A downstream marching solution Upstream boundary Q = Q(t) Intermediate inflow  Q(j)

7. Hydrology options in MIDUSS 98

8. Design options in MIDUSS 98 zPipes - part-full uniform flow z - surcharged HGL zChannels - simple trapezoidal z- complex (50 points) zPond - detention, rooftop, parking lot, super-pipe zExfiltration trench - split inflow between outflow and exfiltration zDiversion - split major and minor flows zRoute - modified Muskingum-Cunge method

9. Benefits of On-Site Detention (for commercial developments) (1) Should be explored before end-of-pipe BMP (2) Runoff should be attenuated locally when possible (3) Local control of peak flow reduces hydraulic load on centralized quality control (4) Peak flow reduction reduces re-suspension of settled solids (5) Reduce cost of centralized SWM facility (6) Facilitates cost-sharing between benefiting parties.

10. Idealized discretization of a commercial development

11. zDefine catchment 100% impervious zFor 450 sq.m./RD set L = 10 m @ 0.5% zGenerate runoff hydrograph zAdd to Inflow hydrograph zDesign pond - use Rooftop option zConfirm/edit parameters 24 litres/min/25mm zRoute hydrograph Rooftop storage

12. Rooftop storage - Q,V = f(H) Discharge Volume

13. Rooftop storage - Results

14. Parking lot storage (1)

15. Parking lot storage (2) Rim elevation Catch basin Invert level Volume Discharge Rim capacity

16. Parking lot storage (3) Rim Elevation

17. Flood routing T i+1 TiTi X j+ 1 XjXj Time T Distance X tt  t xx  x Cr=c  t/  x=2 Nucleus Unstable

18. Muskingum-Cunge method Diffusion equation is where D can be defined by: subject to stability criteria

19. Running in Automatic mode Created in previous manual run

20. Running in Automatic mode Test previous design for more severe storm Complete design in 2 or more sessions Add extra commands Modify design for more severe storm

21. Edit Panel and Control Panel

22. Applications of MIDUSS 98 zProgram functionality has been developed over many years of professional practice. zHas proved valuable in ‘fleshing out’ Master Drainage Plans to separate local and centralized SWM facilities zMost recent application in Belleville, Ontario to 400 ha catchment to assign cost sharing among two municipalities, 8 to 10 new developments and many existing developments.

23. Conclusions zDrainage design cannot easily separate simulation and design

24. Conclusions zDrainage design cannot easily separate simulation and design zDesign process needs a highly interactive decision support system

25. Conclusions zDrainage design cannot easily separate simulation and design zDesign process needs a highly interactive decision support system zAutomatic mode allows sensitivity of design to storm magnitude to be tested incrementally.

26. Conclusions zDrainage design cannot easily separate simulation and design zDesign process needs a highly interactive decision support system zAutomatic mode allows sensitivity of design to storm magnitude to tested be incrementally. zVersatile hydrology simulation and flexible, interactive design provides a training tool for professional and student.