LOCAL DESIGN STORM: VOLUME II. METHODOLOGY AND ANALYSIS

Recently developed improved methods for highway storm water drainage require information on the temporal distribution of rainfall (i.e., hyetograph) in addition to the average rain intensity. The triangular design hyetograph method is developed as a practical method to provide the local storm hyetograph for design of small highway drainage facilities. The method is based on the methods of moments, using and preserving the statistical mean of the first time moment of rainstorms. The method is proposed as a trade-off between theoretical sophistication and practical simplicity. A total of 293,946 rainstorms from the hourly precipitation data of 222 National Weather Service stations and 5 to 60 minute data of 13 raingage stations of USDA Agricultural Research Service were analyzed to provide the statistical values of the hyetograph parameters for the United States. In Volume II existing methods to describe the temporal distribution of the rainfall of a design storm are first briefly reviewed. Next, different definitions of rainstorms are discussed. The theory of the first-moment triangular design hyetograph method is presented. Details of the rainstorm data utilized are described. The results of the statistical analysis of the data are summarized and discussed. From these results a national map of the value of the nondimensional peak rain time of the triangular hyetograph is developed for use in highway storm drainage designs. (FHWA)

• Record URL:
  https://rosap.ntl.bts.gov/view/dot/41863
• Supplemental Notes:
  • The other volumes of this report set are: Vol. I. Executive Summary (FHWA/RD-82/063), Vol. III. User's Manual (FHWA/RD-82/065), Vol. IV. Tabulation of Sample Detail Results of Statistical Analysis (FHWA/RD-82/066).
• Corporate Authors:

  University of Illinois, Urbana-Champaign

  Department of Civil and Environmental Engineering
  205 North Mathews Avenue
  Urbana, IL  United States  61801-2352

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Yen, B C
  • Chow, V T
• Publication Date: 1983-5

Media Info

• Media Type: Digital/other
• Pagination: 205 p.

Subject/Index Terms

• TRT Terms: Data analysis; Design methods; Design storm; Drainage; Graphs; Hydrology; Maps; Mathematical analysis; Rainfall; Statistical analysis; Surface drainage
• Uncontrolled Terms: Hyetographs
• Old TRIS Terms: Highway drainage
• Subject Areas: Data and Information Technology; Design; Highways; Hydraulics and Hydrology; I26: Water Run-off - Freeze-thaw;

Filing Info

• Accession Number: 00381772
• Record Type: Publication
• Report/Paper Numbers: FHWA-RD-82-064 Final Rpt., FCP 35H2-082
• Contract Numbers: DOT-FH-11-9666
• Files: NTL, TRIS, USDOT
• Created Date: Mar 30 1984 12:00AM