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1 SYNTHESIS OF RAINFALL AND RUNOFF DATA USED FOR TEXAS DEPARTMENT OF TRANSPORTATION RESEARCH PROJECTS 0–4193 AND 0–4194 By William H. Asquith1, David B. Thompson2, Theodore G. Cleveland3, and Xing Fang4 ABSTRACT In the early 2000s, the Texas Department of Transportation funded several research projects to examine the unit hydrograph and rainfall hyetograph techniques for hydrologic design in Texas for the estimation of design flows for stormwater drainage systems. A research consortium comprised of Lamar University, Texas Tech University, the University of Houston, and the U.S. Geological Survey (USGS), was chosen to examine the unit hydrograph and rainfall hyetograph techniques. Rainfall and runoff data collected by the USGS at 91 streamflow-gaging stations in Texas formed a basis for the research. These data were collected as part of USGS small-watershed projects and urban watershed studies that began in the late 1950s and continued through most of the 1970s; a few gages were in operation in the mid-1980s. Selected hydrologic events from these studies were available in the form of over 220 printed reports, which offered the best aggregation of hydrologic data for the research objectives. Digital versions of the data did not exist. Therefore, significant effort was undertaken by the consortium to manually enter the data into a digital database from the printed record. The rainfall and runoff data for over 1,650 storms were entered. To enhance data integrity, considerable quality-control and qualityassurance efforts were conducted as the database was assembled and after assembly to enhance data integrity. This report documents the database and informs interested parties on its usage.In the early 2000s, the Texas Department of Transportation funded several research projects to examine the unit hydrograph and rainfall hyetograph techniques for hydrologic design in Texas for the estimation of design flows for stormwater drainage systems. A research consortium comprised of Lamar University, Texas Tech University, the University of Houston, and the U.S. Geological Survey (USGS), was chosen to examine the unit hydrograph and rainfall hyetograph techniques. Rainfall and runoff data collected by the USGS at 91 streamflow-gaging stations in Texas formed a basis for the research. These data were collected as part of USGS small-watershed projects and urban watershed studies that began in the late 1950s and continued through most of the 1970s; a few gages were in operation in the mid-1980s. Selected hydrologic events from these studies were available in the form of over 220 printed reports, which offered the best aggregation of hydrologic data for the research objectives. Digital versions of the data did not exist. Therefore, significant effort was undertaken by the consortium to manually enter the data into a digital database from the printed record. The rainfall and runoff data for over 1,650 storms were entered. To enhance data integrity, considerable quality-control and qualityassurance efforts were conducted as the database was assembled and after assembly to enhance data integrity. This report documents the database and informs interested parties on its usage. INTRODUCTION The U.S. Geological Survey (USGS) in collaborative peer-to-peer research projects with Lamar University, Texas Tech University, and the University of Houston, has developed a digital database of rainfall and runoff values for selected watersheds in Texas. The research was sponsored by Texas Department of Transportation research (TxDOT) projects 0–4139 and 0–4194. These projects are hereafter referred to as the “TxDOT research projects.” The database is an aggregation of previously published sources and requires documentation in the context of the TxDOT research projects. The data were derived from over 220 historical USGS data reports that occupy approximately 8 linear feet of bookshelf space. In total, the database contains more than 1,650 storms for 91 mostly small rural and urban watersheds in Texas. A small watershed is considered to have a drainage area of less than about 20 square miles. Each storm is 1 U.S. Geological Survey, Austin, Texas 2 Texas Tech University, Lubbock, Texas 3 University of Houston, Houston, Texas 4 Lamar University, Beaumont, Texas

Synthesis of rainfall and runoff data used for Texas Department of Transportation Research Projects 0-4193 and 0-4194