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Comprehensive Storm Precipitation Analysis in Dallas County Using GIS Technologies

This study examines storm precipitation data in Dallas County from 1997 to 2009, utilizing high-resolution Doppler radar and NEXRAD data. We analyzed data from 147 virtual stations, processing daily and hourly precipitation records for improved hydrologic system design and drainage management. The results reveal significant insights into precipitation distribution patterns, with an average annual precipitation of 33.76 inches observed. The analysis highlights the importance of GIS in managing water resources, offering valuable computational tools for hydrologic modeling and data processing.

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Comprehensive Storm Precipitation Analysis in Dallas County Using GIS Technologies

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  1. “Storm precipitation analysis in Dallas County” “GIS in WaterResources” by Gonzalo E. Espinoza

  2. Introduction • Design Hydrologic systems • Drainage • Hydraulic Structures • Nextrad (NOAA) • High Resolution Doppler weather radars. • Source of Daily and Hourly data. • GIS • Data Acquisition • Data Processing • Results

  3. Data Acquisition • 13 years • 1997 - 2009 • 147 Virtual Stations • Daily Data (147) • 697,500 • Hourly Data (5) • 569,00

  4. Precipitation: Raw Data • Daily Hourly

  5. Data Processing • Export table HydroDesktop • Add Table ArcGIS • Project x,y • Time Enabled bar • Thiessen Polygons Tool • Mean Center • Maximum Series • Daily • Hourly • ProbabilityDistribution • i-d-T and p-d-T curves

  6. https://webspace.utexas.edu/gee272/www/Index_files/GIS/pMovie.wmvhttps://webspace.utexas.edu/gee272/www/Index_files/GIS/pMovie.wmv

  7. Maximum Series

  8. Probability Distributions

  9. Precipitation Distribution Daily Data Hourly Data • 147 Stations • AAP = 33.76 inches • Uniform • 5 Stations • AAP = 34.20 • South East

  10. Results • 98.7% AAP • Same Mean / Different distribution • Representative values of precipitation • In order to compare, select the same stations

  11. Conclusions • Derived Data • Representative • Smaller Extrapolated Area • Computational Time • Downloading, Processing and Projecting • IT fast development • HydroDesktop • Powerful Tool • Sometime Crashes (Beta Version)

  12. Questions? https://webspace.utexas.edu/gee272/www/Index_files/Page305.htm Contact Information: ic.esda@mail.utexas.edu

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