Research on Dimensionless Unit Hydrograph and Time of Concentration for Maryland Watersheds

Brubaker, Kaye L; Karam Zadeh, Mani Shehni; Walcott, Cadijah; Eisenstadt, Joseph; Gleason, Thomas; Seibert, Paul; Slattery, Julia; Walsh, John

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Research on Dimensionless Unit Hydrograph and Time of Concentration for Maryland Watersheds

2021-08-31
By Brubaker, Kaye L ; Karam Zadeh, Mani Shehni ; Walcott, Cadijah

File Language:

English

[PDF - 41.71 MB]

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Creators:

Brubaker, Kaye L ; Karam Zadeh, Mani Shehni ; Walcott, Cadijah ; Eisenstadt, Joseph ; Gleason, Thomas ; Seibert, Paul ; Slattery, Julia ; Walsh, John
Corporate Creators:

University of Maryland (College Park, Md.). Department of Civil and Environmental Engineering
Corporate Contributors:

Maryland. Department of Transportation. State Highway Administration ; Maryland. State Highway Administration. Office of Policy & Research
Subject/TRT Terms:
Publication/ Report Number:

MD-21-SHA/UM/5-04
Resource Type:

Tech Report
Geographical Coverage:

Maryland;United States
Edition:

SPR-B Final Report (Aug 2018–Aug 2021)
Corporate Publisher:

Maryland Department of Transportation. State Highway Administration
Abstract:

Observed data from 100 rainfall-runoff events on 54 watersheds in Maryland and Delaware were used to investigate two watershed characteristics: the dimensionless unit hydrograph (DUH) and time of concentration (Tc). Streamflow hydrograph data were obtained from US Geological Survey gaging stations. Event hyetographs were generated from US Weather Service NEXRAD Radar Stage III data (DPR) using a method developed in this study. The gamma-function form of the Natural Resources Conservation Service unit hydrograph was assumed. For each event, an optimization method was used to determine the time to peak and gamma parameter (related to the Peak Rate Factor, PRF) that give the best-fit direct runoff hydrograph when convolved with the rainfall excess hyetograph. Tc was estimated by differentiation of the unit hydrograph. Efforts to predict PRF and Tc using watershed properties, and to update an existing regression equation, were inconclusive. Future investigations will focus on improving the event baseflow separation and determination of rainfall excess.
Format:

PDF
Funding:

SHA/UM/5-04
Download URL:

https://rosap.ntl.bts.gov/view/dot/65490/dot_65490_DS1.pdf
File Type:

[PDF - 41.71 MB]
Collection(s):

US Transportation Collection
Main Document Checksum:

urn:sha-512:1bbb58746c8d4e2bfd6a4c47b427406237120e684095cc3017d8129b773d97f721dc87cb3b3f5e928b30ed81d59a57bfc8448214a3b128accfdcfb6046d9c1d0

File Language:

English

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