1. Defining a Design Storm zDefine the time parameters zSelect storm type - 5 options zEnter required parameters e.g. Depth, duration etc. zDisplay rainfall as table and graph zAccept the storm zDefine a 5-character descriptor

2. Storm Types Available zChicago hyetograph zHuff rainfall distribution zMass rainfall distribution (can be user defined) zCanada AES (Atmospheric Environment Service) zHistoric storm (user defined)

3. Chicago hyetograph

4. Huff Distribution

5. Huff storm - 1st quadrant 1st quadrant

6. Huff storm - 2nd quadrant 2nd quadrant

7. Huff storm - 3rd quadrant 3rd quadrant

8. Huff storm - 4th quadrant 4th quadrant

9. Mass Rainfall Distribution zDefined by series of uniformly spaced vertical coordinates which increase continuously from 0.0 to 1.0 zVarious standard distributions for North America included with MIDUSS 98 zUser defined distributions are easily defined using local data zMaximum number of points is unlimited

10. Mass Rainfall example

11. Historic Storm Last value entered by user 15 values still zero

12. City of Guelph Design Storms Return ab c r period(mm/hr) (min) 2-years 743 6.79890.4 5-years159311.87890.4 10-years222112.90800.4 25-years315815.93550.4 50-years388616.94950.4 100-years468817.96240.4