This program creates rainfall intensity - duration - frequency curves, also known as IDF curves. The equation of the IDF curves is i=kT^a/(t+b)^m. The user can either utilize unprocessed data from one or more rain gages or processed time series given as maximum annual rainfall heights per rainfall duration.

Features

• Calculates all coefficients of the generic rainfall intensity - duration - frequency equation.
• Can read raw rainfall data from one or more raingages.
• Can use manimum annual rainfall heights instead of raw data.
• To estimate the coefficients the following distributions can be used:
  • Gumbel
  • Normal
• Empirical probability of exceedance is calculated using:
  • Weibull
  • Gringorten
  • Cunnane
  • Blom
  • Hazen.
• It is possible to use a pre-defined constant b coefficient.
• Import / export data from / to Microsoft Excel or other spreadsheets.
• A correction factor for areal precipitation may be used when the rational method is applied.
• The concentration time can be estimated using the well known formulas of Izzard, California Culverts Practice and Kinematic wave.
• Formatted output to Microsoft Word for professional printouts with minimal user intervention.
• Theoretical background has been added in the documentation.
• Multilevel undo and redo.
• Professional reports and printouts in Microsoft Word or directly to the printer.
• Tip of the day.
• Full user guide.
• Tutorials.
• Live Update.
• English and Greek interface.