TxDOT Research Library - Publication Details

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Title:

Updating the Texas Rainfall Coefficients and Enhancing the EBDLKUP Tool: Technical Report

Report No.:

FHWA/TX-20/0-6980-R1

Authors:

by Andrew Birt [and three others]

Published:

2019

College Station, Texas

Texas A & M Transportation Institute

Series:

Cooperative Research Program (Texas Department of Transportation)

Type:

Online document

1 PDF (100 pages)

Online Access:

https://tti.tamu.edu/documents/0-6980-R1.pdf

Access Note:

4.7 MB

Summary

Currently, the Texas Department of Transportation (TxDOT) uses EBDLKUP-2015-V2.xls to estimate location-specific storm intensities for hydraulic design. This tool is based on storm frequency and duration data analyzed and summarized between 1998 and 2004. In 2019, the National Oceanic and Atmospheric Administration Atlas 14 project released the results of new data on the depth, duration, and frequency of storms within Texas. This study describes methods and analyses to incorporate the new Atlas 14 data into TxDOT's hydraulic design process. The outcome of the study is a new hydraulic design tool provisionally named EBDLKUP-2019. This tool improves the accuracy of statewide hydraulic design in two ways. First, it incorporates the latest information on the statewide spatial pattern of storms into the hydraulic design process. An analysis detailing how this spatial pattern has changed since the development of the previous tool is included in this report. Second, the tool improves the spatial accuracy of rainfall intensity predictions to subcounty rainfall zones. An analysis detailing the derivation of these subcounty rainfall zones is also provided in the report.

Publ. Place

College Station, Texas

Contents

Chapter 1. Introduction --
Chapter 2. State-of-the-Practice Review --
Chapter 3. Review of Depth-Duration-Frequency and Intensity-Duration-Frequency Studies --
Chapter 4. Methods for Calculating EBD Values --
Chapter 5. Analysis of Atlas 14 Data Rainfall Patterns --
Chapter 6. Delineating Texas Rainfall Zones --
Chapter 7. Implementing New Rainfall Zones and Developing New Hydraulic Design Tools --
Chapter 8. Conclusion --
References --
Appendix. Value of Research

Notes

"Published December 2019"

Study Number

TxDOT Research Project 0-6980

Study Title

Update Rainfall Coefficients with 2018 NOAA Atlas 14 Rainfall Data

Study Sponsor

Lead University

TTI