WSP09829

• File Number: 8200.760
• Description: Yampa River General
• State: CO
• Basin: Yampa/White
• Water Division: 6
• Date: 1/1/1989
• Author: USGS
• Title: Simulation of Streamflow in Small Drainage Basins in the Southern Yampa River Basin - Colorado
• Water Supply Pro - Doc Type: Report/Study

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PERCENTAGE OF TIME THAT STREAMFLOW IS EQUALED OR EXCEEDED

Figure 8.--0bserved and simulated streamflow for the period of record
(water years 1976-81) for streamflow-gaging station Jubb Creek
near Axial (09250610).

Basin storage is an important component of the water balance. In these
semiarid drainage basins, the storage of water from a previous wet year is used
in subsequent dry years. This is indicated in the model results by the sequence
of pluses and minuses through the years as listed in table 7.

Water storage that is used in subsequent years or in a sequence of wet
years to augment streamflow is shown in figure 9, which is a plot of the
relation of annual net precipitation to observed and simulated annual stream-
flows, in inches, for one streamflow-gaging station. The plot indicates that
the relation between annual net precipitation and annual observed or simulated
streamflow is not strictly linear. For example, water years 1978 and 1980 have
almost the same net precipitation; however, the observed streamflow ranges from
1.76 in. in 1978 to 3.35 in. in 1980. The annual precipitation for the
preceding year was much different in these two instances--1977 was a dry year
and 1979 was much wetter. The simulated streamflow for 1978 was about 2.0 in.
and for 1980 was about 2.4 in. These simulated values follow the same trend as
the observed values, but the simulated values do not have the large difference
that occur in the observed values.

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