7050

• UCREFRP Catalog Number: 7050
• Author: Andrews, E. D.
• Title: Effective And Bankfull Discharges of Streams In THe Yampa River Basin, Colorado and Wyoming
• USFW Year: 1980
• USFW - Doc Type: Journal of Hydrology
• Copyright Material: YES

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material and significant quantities of material larger than 100 mm in diameter.
For these streams, II. bedload-transport rate was computed for each size class,
which then was multiplied by the fraction of the bed in the size class. The
bedload-transport rate for a given discharge at the gaging station was deter-
mined by summing the bedload-transport rates of the several size classes. Com-
puted bedload-transport rates were typically less than 20% of the total sedi-
ment load. Thus, although the uncertainty of the bedload-transport rate may
be large (:t50%) (White et al., 1975), the uncertainty in the total sediment
load introduced by computing rather than measuring the bedload-transport
rate is small.
The bedload-transport rate vs. discharge relation was determined by fitting
a curve to several computed bedload-transport rates for the range of discharges.
The total sediment-load vs. discharge relation (daily values) was determined

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0.01 0.1 1 5 20 50 80 95 99 99.9
PERCENTAGE OF TIME DISCHARGE AND SEDIMENT LOAD
ARE EQUALED OR EXCEEDED

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Fig. 3. Streamflow and total sediment-load-duration curves for the Little Snake River
near Dixon, Wyoming. .

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