00196765

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http://onlinepubs.trb.org...s/trr/1978/685/685-008.pdf

https://scholar.google.co...eich&publication_year=1978

Thirty-two years of maxima observed at Tucson International Airport from the National Oceanic and Atmospheric Administration's recording raingage are used to prepare a sheet of intensity-duration-frequency curves commonly used in the design of storm drainage for small urban areas. The example is employed to stress the need for examining computer printouts of mathematical statistical analysis of the rains and their logarithms by plotting data on four types of probability paper. Stress is laid on dangers of blindly extrapolating a mathematical distribution that does not fit recorded amounts for the long return periods in which engineers are usually interested. Misapplication of scales involving a logarithmic transformation are discussed. The fact that longer durations may require a different type of frequency paper than do shorter durations is illustrated and rationalized on the basis of the physical process. Internal compatibility of results for 2-, 5-, 10-, 50-, and 100-year estimates of 5-, 10-, 20-, 30-, 45-, 60-, 120-, and 180-min rainfalls is preserved when examining a tabular array of as many as five frequency analyses on one of these 48 cells. /Author/

Publication of this paper sponsored by Committee on Hydrology, Hydraulics and Water Quality. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.

01414337

pp 35-43

1978

Transportation Research Record

0309028302

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Figures (7) ; References (16) ; Tables (5)

Accuracy; Data analysis; Frequency (Electromagnetism); Information processing; Logarithms; Mathematical analysis; Rainfall; Statistical analysis; Time

Rainfall intensity

Data and Information Technology; Highways; Hydraulics and Hydrology

TRIS, TRB

Sep 15 1979 12:00AM

• COST-EFFECTIVENESS OF DRIVEWAY SLOPE IMPROVEMENTS
• DETERMINING DESIGN FLOWS FOR CULVERTS AND BRIDGES ON UNGAUGED STREAMS: A WATERSHED RATIONALE. ABRIDGMENT
• EARTH BERMS AND THEIR ACTUAL AND PERCEIVED EFFECTS ON NOISE AND PRIVACY IN ADJACENT NEIGHBORHOODS
• EDGE-OF-PAVEMENT PROFILES
• HYDRAULIC AND SAFETY CHARACTERISTICS OF SELECTED GRATE INLETS. ABRIDGMENT
• PAVEMENT WIDTH STANDARDS FOR RURAL TWO-LANE HIGHWAYS. ABRIDGMENT
• SUPERELEVATION AND CURVATURE OF HORIZONTAL CURVES