7049

• UCREFRP Catalog Number: 7049
• Author: Andrews, E. D.
• Title: Present and Potential Sediment Yields In THe Yampa River Basin, Colorado and Wyoming.
• USFW Year: 1978.
• USFW - Doc Type: \
• Copyright Material: NO

Map showing areal distribution of mean-annual precipitation
in the Yampa River basin. . . . . . . . . . . . . . . . .
Graph showing comparison of computed sedi8ent yields in the
Yarpa River basln with estimated sediment yields using
the Pacific SouthvJest Inter-Agency Committee method. . .
Graph showing comparison of average se~iment yields versus
mean-annual precipitation for 17 gaging stations iG the
Yarra River basin v.;ith the general rel-ation'bet\-Jeen sedi-
Cient-yield and mean-annual precipjtat:on for the United
States.. .--.

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Figure 8.

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CONTENTS

Page

21

24

26

_:_--

TABLES

Table 1. Sum~ary of dai Iy streamflow and sediment data for selected
stream-gaging stations in ~be Yampa River basin, Colorado
and \'!YOr:1 i ng . . . . . . . . . . . . . . . . . . . . . 5
2. Surnmary or mean-annual streamflclI-J and computed sediment
load at selected stream-gaging stations in the Yampa
River basin, Colorado and Wyoming. . . . . . . . . . 12
3. Factors and rating ranges used in the Pacific South"'lest
Inter-Agency Committee method for estimating sediment
yields using terrain characteristics. . . . . . . . . 23
4. Potential sediment yields from surface-mined areas in the
Ya~pa River basin for three estimated levels of coal
product i on by 1990. . . . . . . . . . . . . . . . . . . 29

METRIC CONVERSIONS

Inch-pound units used in this report may be expressed as metric units by
use of the following conversion factors:

:.:1dti,;l~J {'1.C;:-pound wn:t

inch
foot per second
acre
square mile (ni'-)
cubic foot per second (ft3/s)
ton
ton per year
ton per acre
ton per square ~ile (ton/miL)

ton per square ~ile per year
((ton/mi2)/yr]

By ~o ob ta.1:;'l J.. . 'J..
me&r1.-C UY!.1..-v
25.40 millimeter (mm)
0.3048 meter per second
0.4047 hectare (ha)
2.59 square k i I ome t e r (kmL)
0.02832 cubi c meter per second (m3/s)
0.9074 me t r i c ton ( t)
0.9074 me t r i c ton per year J
2.242 me t r i c ton per hectare (t/ha) I
0.3503 me t r i c ton per square i
k i I orne t e r (t/km2)
0.3503 metric ton per square
ki lometer per year
[(t/km2)/yr)

IV