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This version was saved 10 years, 9 months ago View current version     Page history
Saved by Dr. Ron Eaglin
on July 26, 2011 at 10:29:00 am


  UCF Rainfall Analysis 


This site will be closed during the peer review process (projected completion April 2011). All links from this page are currently disabled. You can request and get access to the files during this time (use Request Access).




The rainfall analysis and rainfall analysis software was produced as funded projects by the Southwest Florida Water Management District and the United States Geologic Survey by the Stormwater Management Institute at University of Central Florida. They are provided here as a service to engineers and technicians needing the results of this analysis.


Overview and Methodology Documentation



List of Sites (Analysis links)


  • List of Sites - Analysis Results - This page contains all sites with links to the full analysis of each site. Quality control information, site results, and distribution results are all included. 
  • Shape Files - The final results and rainfall contours as ESRI Shape Files.
  • Autcad DXF Files - The DXF Export of all contours (Autcad DXF format).
  • Surfer SRF Files - All Files in Surfer format.
  • Surfer Grid Files - The Grid Files for the Analysis, Surfer and AASCII format.
  • Surfer Post Files - Post maps showing values and locations used in analysis.
  • Google Earth (KML) Demo - See how the maps look in Google Earth.


Return Period Analysis Results


For each return period listed a table of the predicted maximum for each duration is shown. The predicted maximum is the value that is determined by (1) fitting the annual actual maxima to a distribution, and (2) fitting these distribution results to a linear regression model. The raw maxima and curve fit parameters are shown in the analysis results for each site in the List of Sites - Analysis Results.



     Master Spreadsheet: StationCoordinates.xls

     Stations used in Analysis (n >= 20) Spreadsheet: StationCoordinatesNGT20.xls 


Kriging Analysis Results  


The krig analysis was done twice, once without a nugget effect, once with a nugget effect. In standard krig (no nugget effect), the iso lines are forced to go through all values at their exact values. This makes sense if you are developing contours where all values are exact. In the case of rainfall values there exists an uncertainty to each value. The nugget effect krig takes into account the variance between spatial rainfall values and allows the iso lines to have to match exact values at a point. This in turn smooths the curves. The nugget effect krig was done in response to a peer review of the analysis which will be published upon acceptance of the curves.


  • Kriging Analysis Results - The full rainfall distribution results were fit to state isohyetal plots using standard kriging techniques. Each of the results for all analyzed durations and return periods are included here. To access the full folder click here StandardKriging 
  • Nugget Kriging (1) -  As part of the peer review process Nugget Kriging was a recommendation to smooth the curves. In standard kriging, iso lines are forced to go through all geographic points at the actual value of the point. This causes a tent post effect. In the case of rainfall data, these values do have a natural variance. An error variance of 0.5 and a micro variance on 0.5 was used in the kriging analysis utilizing a second variogram specifying these effects. The result of the smoothed variograms are in the linked folders. A full explanation of the analysis is included on the page - Correcting for Rainfall Iso Variance Using the Nugget Effect.


Additional Files and Links


Rainfall Analysis Software - This is the software, source code, and support files for the software written to perform these analyses. Links to other software to support the analysis are also included.

SMADA Documentation - This is the documentation to Stormwater Management and Design Aid - a Windows software for analysis and hydrograph generation. SMADA is now open source, and I am in the process of posting code files.


SMADA Code Files - Here is where to find the code files for the SMADA program.


Other Program Source Code Files - Source code to other files such as RainDigitizer, Rainplot, etc...


Linda Eaglin Thesis - Development of the Intensity Duration Frequency Curves for the State of Florida


References and Other Reports Links


References and Support Documents - Links to all the references and indirect support documents for this work and other rainfall work.


Authors and Researchers


Dr. Martin Wanielista

Dr. Ron Eaglin

Linda Eaglin




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