Notes
Slide Show
Outline
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Defining a Design Storm
  • Define the time parameters
  • Select storm type - 5 options
  • Enter required parameters
    e.g.  Depth, duration etc.
  • Display rainfall as table and graph
  • Accept the storm
  • Define a 5-character descriptor
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Storm Types Available
  • Chicago hyetograph
  • Huff rainfall distribution
  • Mass rainfall distribution (can be user defined)
  • Canada AES   (Atmospheric Environment Service)
  • Historic storm  (user defined)
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Chicago hyetograph
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Huff Distribution
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Huff storm - 1st quadrant
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Huff storm - 2nd quadrant
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Huff storm - 3rd quadrant
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Huff storm - 4th quadrant
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Mass Rainfall Distribution
  • Defined by series of uniformly spaced vertical coordinates which increase continuously from 0.0 to 1.0
  • Various standard distributions for North America included with MIDUSS 98
  • User defined distributions are easily defined using local data
  • Maximum number of points is unlimited
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Mass Rainfall example
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Historic Storm
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City of Guelph Design Storms