DIMENSIONLESS UNIT HYDROGRAPH FOR THE DELMARVA PENINSULA

The Soil Conservation Service uses a dimensionless unit hydrograph to develop storm hydrographs for hydrologic evaluation of small watersheds and for hydrologic design of conservation measures. An average dimensionless unit hydrograph has been used extensively nationwide with reasonable success. However, in flatlands such as the Atlantic coastal plains, stream gauge analysis indicates that another shaped dimensionless unit hydrograph that is signficantly different from the average should be used. An average dimensionless unit hydrograph for coastal flatlands was developed by using the techniques in the U.S. Army Corps of Engineers HEC-1 computer program. An average C sub p value for the Snyder unit hydrograph was determined from seven events on four streams. The flatland unit hydrograph was then used to generate peakflow frequency curves with reasonable success at the four stream gauge sites plus one additional site.

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/trr/1989/1224/1224-011.pdf
• Record URL:
  https://scholar.google.com/scholar_lookup?title=DIMENSIONLESS+UNIT+HYDROGRAPH+FOR+THE+DELMARVA+PENINSULA&author=P.+Welle&author=D.+Woodward&publication_year=1989
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0309048184
• Supplemental Notes:
  • This paper appears in Transportation Research Record No. 1224, Rest Areas, Wetlands, and Hydrology. 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
• Authors:
  • Welle, P I
  • Woodward, D E
• Publication Date: 1989

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 79-87
• Monograph Title: Rest areas, Wetlands and hydrology
• Serial:
  • Transportation Research Record
  • Issue Number: 1224
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Conservation; Design; Dimensionless parameters; Flood hydrographs; Peak discharge; Watersheds
• Uncontrolled Terms: Coastal plains
• Subject Areas: Design; Environment; Highways; Hydraulics and Hydrology; I26: Water Run-off - Freeze-thaw;

Filing Info

• Accession Number: 00495045
• Record Type: Publication
• ISBN: 0309048184
• Files: TRIS, TRB
• Created Date: Jun 30 1990 12:00AM