TRB Pubsindex
Text Size:
x

« Prev Next »

Return to Results | New Search

Bookmark and Share

Title:

SIMULATION OF FLOOD HYDROGRAPHS FOR GEORGIA STREAMS

Accession Number:

00474345

Record Type:

Component

Availability:

Find a library where document is available


Order URL: http://worldcat.org/isbn/0309040671

Abstract:

Flood hydrographs are needed for the design of many highway drainage structures and embankments. A method for simulating these flood hydrographs at urban and rural ungauged sites in Georgia is presented. The O'Donnell method was used to compute unit hydrographs from 355 flood events from 80 stations. An average unit hydrograph and an average lag time were computed for each station. These average unit hydrographs were transformed to unit hydrographs having durations of one-fourth, one-third, one-half, and three-fourths lag time and then reduced to dimensionless terms by dividing the time by lag time and the discharge by peak discharge. Hydrographs were simulated for these 355 flood events and their widths were compared with the widths of the observed hydrographs at 50 and 75 percent of peak flow. The dimensionless hydrograph based on one-half lag-time duration provided the best fit of the observed data. Multiple-regression analysis was used to define relations between lag time and certain physical basin characteristics, of which drainage area and slope were significant for the rural equations, with impervious area being added for the Atlanta urban equation. A hydrograph can be simulated from the dimensionless hydrograph, peak discharge of a specific recurrence interval, and lag time obtained from regression equations for any site of less than 500 sq mi in Georgia. For simulating hydrographs at sites larger than 500 sq mi, the U.S. Geological Survey computer model CONROUT can be used. CONROUT produces a simulated outflow discharge hydrograph with a peak discharge of a specific recurrence interval. The diffusion analogy routing method with single linearization was used in this study.

Supplemental Notes:

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

Monograph Title:

Hydraulics and hydrology

Monograph Accession #:

01418775

Authors:

Inman, E J
Armbruster, J T

Pagination:

pp 15-23

Publication Date:

1986

Serial:

Transportation Research Record

Issue Number: 1073
Publisher: Transportation Research Board
ISSN: 0361-1981

Conference:

65th Annual Meeting of the Transportation Research Board

Location: Washington District of Columbia, United States
Date: 1986-1-13 to 1986-1-16

ISBN:

0309040671

Media Type:

Print

Features:

Figures (6) ; Maps (1) ; References (9) ; Tables (4)

Uncontrolled Terms:

Lag time

Geographic Terms:

Georgia

Old TRIS Terms:

Georgia

Subject Areas:

Data and Information Technology; Highways; Hydraulics and Hydrology; I26: Water Run-off - Freeze-thaw

Files:

TRIS, TRB

Created Date:

Oct 31 1987 12:00AM

More Articles from this Serial Issue: