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Title:

LADOTD 24-HOUR RAINFALL FREQUENCY MAPS AND I-D-F CURVES. SUMMARY REPORT

Accession Number:

00636314

Record Type:

Monograph

Availability:

National Technical Information Service

5301 Shawnee Road
Alexandria, VA 22312 USA
Order Number: PB93-200848

Abstract:

Maximum annual 24-hour rainfall maps and Intensity-Duration-Frequency (I-D-F) curves for return periods of 2, 5, 10, 25, 50 and 100 years were developed using hourly precipitation data. Data from 92 rain gauges for the period of 1948 to 1987 were compiled and combined into 26 synthesized stations. Five probability distributions and three parameter estimation techniques were tested. The best combination for Louisiana rainfall data was found to be Log-Pearson Type 3 distribution (LPEAR3) with parameter estimation by the method of moments. A first-order error analysis was performed on the parameters of the Soil Conservation Service (SCS) runoff model and LPEAR3 distribution. Computed runoff was found to be equally sensitive to both SCS parameters, rainfall input and the curve number. Computed quantiles from LPEAR3 distribution were found to be most sensitive to the mean of data and relatively insensitive to the skew coefficient. It is anticipated that the rainfall maps and I-D-F curves developed in this study will result in more reliable design and consequently, in savings in both construction and maintenance and highway drainage structures.

Report Numbers:

FHWA/LA-91/236

Contract Numbers:

90-1SS(B)
90-2SS(B)

Language:

English

Corporate Authors:

Louisiana Transportation Research Center

Louisiana State University, 4101 Gourrier Avenue
Baton Rouge, LA 70808 USA

Louisiana Department of Transportation and Development

1201 Capitol Access Road, P.O. Box 94245
Baton Rouge, LA 70804-9245 USA

Federal Highway Administration

1200 New Jersey Avenue, SE
Washington, DC 20590 USA

Authors:

Naghavi, B
Singh, V P
Yu, F X

Pagination:

28 p.

Publication Date:

1991-8

Period Covered:

8908-9108

Uncontrolled Terms:

Old TRIS Terms:

Subject Areas:

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

Files:

TRIS, USDOT, STATEDOT

Created Date:

Sep 13 1993 12:00AM