Feasibility Study on Research of Local Design Storms

Yen, B. C.; Chow, Ven Te

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Feasibility Study on Research of Local Design Storms

1977-11-01
By Yen, B. C. ; Chow, Ven Te

File Language:

English

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Creators:

Yen, B. C. ; Chow, Ven Te
Corporate Creators:

University of Illinois at Urbana-Champaign. Dept. of Civil Engineering
Contributors:

Woo, DC
Corporate Contributors:

United States. Department of Transportation. Federal Highway Administration. Offices of Research and Development
Subject/TRT Terms:

Design Drainage Structures Feasibility Analysis Rain Rainfall Storms Surface Drainage Urban Areas
Publication/ Report Number:

FHWA-RD-78-65
Resource Type:

Tech Report
Right Statement:

Public Domain
Geographical Coverage:

United States
Edition:

Final Report
Contracting Officer:

Woo, D.C.
Corporate Publisher:

United States. Department of Transportation. Federal Highway Administration. Offices of Research and Development
Abstract:

Improved methods for design and pollution abatement evaluation of urban highway drainage facilities require not only the average rainfall intensity of the storm but also the time distribution of the rainfall. Since the temporal pattern of rainfall varies with storms and the patterns of future storms cannot be predicted exactly, the design hyetograph can only be determined probabilistically using statistical values of past events. By using the moments of the statistical values nondimensional hyetographs can be established and then used to produce the design hyetographs. The nondimensional triangular hyetograph method is based on the statistical mean of the first moment of recorded rainstorms and triangular representation of the hyetographs, and nondimensionalized using the rainfall duration and depth. An analysis of 9,869 rainstorms at four locations indicates that for a given season the nondimensional triangular hyetographs for heavy rainstorms are nearly identical, having only secondary effects from the duration of rainfall, measurement accuracies of standard U.S. National Weather Service precipitation data, and insignificant effect of geographic locations. Simple procedures of how to use the nondimensional triangular hyetograph to produce the design hyetograph are outlined. The possibility of using trapezoidal nondimensional hyetographs is also discussed. However, it is recommended that more rainstorms from other locations should be analyzed to verify the conclusions of this study. The computer programs together with user's manual for the statistical analysis of rainstorms are presented.
Format:

PDF
Funding:

DOT-FH-PO-6-3-0160
Collection(s):

Federal Highway Administration
Main Document Checksum:

urn:sha-512:5c18c3549667e6d691cfa9838251e7cfd67e57e89a69b2f54e565c071e4b1165b927dd198b845bdcd0bbe95b77b19a5b4e7df9cf3429460ee591066246cfcb9a
Download URL:

https://rosap.ntl.bts.gov/view/dot/75211/dot_75211_DS1.pdf
File Type:

[PDF - 8.73 MB ]

File Language:

English

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