Browsing by Subject "flood"

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Boy Standing in Waller Creek Flood Debris
(Austin History Center at Austin Public Library, 1915) Unknown
Changes in Imja Tsho in the Mount Everest Region of Nepal
(2014-09) Somos-Valenzuela, M. A.; McKinney, D. C.; Rounce, D. R.; Byers, A. C.; Somos-Valenzuela, M. A.; McKinney, D. C.; Rounce, D. R.
Imja Tsho, located in the Sagarmatha ( Everest) National Park of Nepal, is one of the most studied and rapidly growing lakes in the Himalayan range. Compared with previous studies, the results of our sonar bathymetric survey conducted in September of 2012 suggest that its maximum depth has increased from 90.5 to 116.3 +/- 5.2 m since 2002, and that its estimated volume has grown from 35.8 +/- 0.7 to 61.7 +/- 3.7 million m(3). Most of the expansion of the lake in recent years has taken place in the glacier terminus-lake interface on the eastern end of the lake, with the glacier receding at about 52 m yr(-1) and the lake expanding in area by 0.04 km(2) yr(-1). A ground penetrating radar survey of the Imja-Lhotse Shar glacier just behind the glacier terminus shows that the ice is over 200 m thick in the center of the glacier. The volume of water that could be released from the lake in the event of a breach in the damming moraine on the western end of the lake has increased to 34.1 +/- 1.08 million m(3) from the 21 million m(3) estimated in 2002.
Effectiveness of Technology Transfer Programs
(University of Texas at Austin, 1976-09) Beard, L.R.
Evaluation of the Benefits of Flood-Control Storage at Multipurpose Reservoirs
(University of Texas at Austin, 1975-04) Ford, D.T.
Flood Control Effects of Headwater Reservoirs: Trinity River, Texas
(University of Texas at Austin, 1979-07) Beard, L.R.; Chang, S.
Flood Flow Frequency Techniques
(University of Texas at Austin, 1974-10-01) Beard, L.R.
Flood Stages and Discharges For Small Streams in Texas: Compilation of Data through September 1970
(U.S. Geological Survey, 1972) Schroeder, E.E.
Research Study No. 4-5-65-85, "Hydrologic Investigation of Small Drainage Areas in Texas," is a cooperative program between the Texas Highway Department and the Water Resources Division of the U.S. Geological Survey. This program, which began in September 1964, is financed by funds made available for research by the Texas Highway Department and the U.S. Department of Transportation, Federal Highway Administration. This report is the sixth in a series of interim reports that describe the objectives, planning, instrumentation, progress, and status of the project. The report includes data collected during the 1970 water year. The objective of the program is to obtain basic hydrologic data that may be used to define the magnitude and frequency of floods for drainage areas of less than 20 square miles. When sufficient data have been obtained, a magnitude and frequency analysis of floods for streams of less than 20 square miles will be prepared. These data will supplement those used by Patterson (1963). To accomplish the objective, a network of 151 crest-stage partial-record gages was established. These gages are distributed throughout the State to sample all hydrologic areas and flood-frequency regions as defined by Patterson (1963} and to obtain a representative sample of physical characteristics. Information for unusual peak discharges at ungaged sites is obtained as the opportunity arises. The planning of this program is directed toward providing a useful regional flood-frequency relation for small streams as soon as the necessary data are collected. Recognizing that an annual-flood series distribution will be used, rainfall-runoff simulation techniques are being tested for possible use in extending records of annual peaks. These techniques should afford useable relations sooner than would be possible by using routine techniques such as the "index-flood method."
Flood Stages and Discharges For Small Streams in Texas: Compilation of Data through September 1971
(U.S. Geological Survey, 1973) Schroeder, E.E.
Research Study No. 4-5-65-85, "Hydrologic Investigation of Small Drainage Areas in Texas," is a cooperative program between the Texas Highway Department and the U.S. Geological Survey. This program, which began in September 1964, is financed by funds made available for research by the Texas Highway Department and the U.S. Department of Transportation, Federal Highway Administration. This report is the seventh in a series of interim reports that describe the objectives, planning, instrumentation, progress, and status of the project. The report includes data collected during the 1971 water year. The objective of the program is to obtain basic hydrologic data that may be used to define the magnitude and frequency of floods for drainage areas of less than 20 square miles. When sufficient data have been obtained, a magnitude and frequency analysis of floods for streams of less than 20 square miles will be prepared. These data will supplement those used by Patterson (1963). To accomplish the objective, a network of 150 crest-stage partial-record gages was established. These gages are distributed throughout the State to sample all hydrologic areas and flood-frequency regions as defined by Patterson (1963) and to obtain a representative sample of physical characteristics. Information for unusual peak discharges at ungaged sites is obtained as the opportunity arises. The planning of this program is directed toward providing a useful regional flood-frequency relation for small streams as soon as the necessary data are collected. Recognizing that an annual-flood series distribution will be used, rainfall-runoff simulation techniques are being tested for possible use in extending records of annual peaks. These techniques should afford usable relations sooner than would be possible by using routine techniques such as the "index-flood method
Flood Stages and Discharges For Small Streams in Texas: For the Period October 1, 1967, to September 30, 1968
(U.S. Geological Survey, 1971) Schroeder, E.E.
Research Study No. 4-5-65-85, "Hydrologic Investigation of Small Drainage Areas in Texas , " is a cooperative program between the Texas Highway Department and the Water Resources Division of the U.S. Geological Survey. This program, which began in September 1964, is financed by funds made available for research by the Texas Highway Department and the U.S. Department of Transportation, Federal Highway Administration. This report is the fourth in a series of interim reports that describe the objectives, planning of the project, the instrumentation, the progress and status of the project, and the data collected during the year. The objective of the program is to obtain basic hydrologic data that may be used to define the magnitude and frequency of floods for drainage areas of less than 20 square miles. When sufficient data have been obtained, a magnitude and frequency analysis of floods for streams of less than 20 square miles will be prepared. These data will supplement those used by Patterson (1963). To accomplish the objective, a network of 151 partial-record crest-stage gages was established. These gages are distributed throughout the State to sample all hydrologic areas and flood-frequency regions as defined by Patterson (1963), and to obtain a representative sample of all physical characteristics. Information for peak discharges at miscellaneous sites is obtained as the need arises. The present flood-frequency analysis (index-flood method) requires a minimum of 10 years of annual peak-discharge data to satisfy the requirements of statistical methods. About 10 years of peak-discharge data are required to sample the variations associated with a minor climatic cycle.
Floodplain Visualization using TINs
(University of Texas at Austin Center For Research in Water Resources, 1999-12) Azagra, Esteban; Olivera, Francisco
For more than thirty years, computer models have been used as essential tools for floodplain determination. Although the combined use of hydrologic and hydraulic models has significantly increased the ability to predict flooding events, the amount of fieldwork required to create and calibrate a model is still considerable. This document presents a methodology that uses aerial mapping as a basis for creating floodplain maps when using the HEC River Analysis System (HEC-RAS) hydraulic model for floodplain analyses. The approach is based on the use of triangular irregular networks (TINs) within a geographic information system (GIS) environment. This methodology was applied to the Waller Creek watershed in Austin, Texas, and involved three phases. First, flow data required by HEC-RAS were determined using the GIS-based application CRWR-PrePro and the hydrologic model HEC Hydrologic Modeling System (HEC-HMS). During the second phase, tools were developed for embedding structures, such as buildings, into the TIN. Finally, the ArcView GIS extension AVRas was used to extract the information contained in the TIN, export it into HEC-RAS, read the results of the hydraulic model and represent the flooded areas. Two and three dimensional animations were developed to show the visualization capabilities offered by GIS. Both, the comparison of the geometric data extracted from a digital representation of the terrain with field data, and the resulting model, show that TINs can be successfully used for floodplain determination and representation purposes.
Generalized Evaluation of Flash-Flood Potential
(University of Texas at Austin, 1975-06) Brand, L.R.
Letter to H.B. Stenzel from Charles E. Porter on Undated
(0000-00-00) Porter, Charles E.
Numerical Simulation of a Watershed as a Means to Evaluate Some Effects of Floodwater-Retarding Structures on Runoff
(University of Texas at Austin, 1969-06-30) Coskun, E.; Moore, W.L.
Optimization Model for the Design of Urban Flood-Control Systems
(University of Texas at Austin, 1976-11) Lott, D.L.
Optimization Model for the Evaluation of Flood-Control Benefits of Multipurpose Multireservoir Systems
(University of Texas at Austin, 1978-05) Ford, D.T.
Population dynamics of Gambusia affinis in an urban creek
(2012-04) Bonney, Ben
It has long been known that vicarience events such as storms can shift fish populations in the wild, but the effects of vicarience events in urban freshwater streams has been poorly studied. An observational study was conducted by measuring the population size of five different species of fish in Waller Creek at five locations that run through the University of Texas campus and the surrounding areas over a period of 16 months. It was found that all species of fish can be displaced downstream over dams with only a moderate storm, but the distance they are displaced varied with the general size of the fish species and the severity of the storm. This understanding of population dynamics in urban creeks allows for the possibility of predictive modeling of vicarience phenomena, as well as the possibility for better assessments of urban creek health.
Record rain brings flooding, cuts power, halts MetroRail
(Austin American-Statesman, 2014-07-19) McLemore, Andrew
Remembering the 100-year flood of '81
(Austin American-Statesman, 2015-05-26) Austin American-Statesman Staff
Texas floods [of] April, May, June, 1957
(State of Texas Board of Water Engineers, 1957-10) Board of Water Engineers
The floods of April-June 1957 in Texas were outstanding both because of the large geographical area which experienced flood conditions and because of the large volume of runoff produced. All streams in the State, from the Red River to the Rio Grande, were in flood much of the time during this three-month period. Excluding the Red River and the Rio Grande and considering only the interior streams in Texas, 38 million acre-feet of runoff, adjusted for storage in major reservoirs, was produced over the State during this three - month period. Peak flows which exceeded previously known floods occurred on only a few streams . The outstanding peak flow which occurred on Palo Pinto Creek, a tributary to the Brazos River near Santo on May 25-26, was the maximum stage known since at least 1880. The flood of May 12 on Sulphur Creek was only 1.5 feet lower than the highest known flood of 1873 at a site about three miles downstream from Lampasas . This report has been prepared to supply hydrologic data needed for immediate planning. Included in the report are general descriptions of the floods, rain fall information, and streamflow and reservoir con tents records at 97 selected gaging stations through out the State.
Waller Creek 1915 Flood Aftermath
(City of Austin, 0000-00-00) Unknown