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

Evaporation
Sublimation

Solar
radiation

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INPUTS

Evapotranspiration

Air
temperature

Precipitation

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Throughfall

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Sublimation

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Evapora tion

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Surface runoff (SAS)

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Evaporation
Transpiration
Transpiration

Snowmelt
Impervious zone
reservoir

Surface runoff (SAS)

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Ground-water flow (BAS)

Streamflow

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Soil zone reservoir

Soil zone
lexcess CEX.;:SJ
Subsurface
, recharge CEXGS-SEPJ

Ground-water
recharge (SEP)

Subsurface flow (RAS)

Ground-water sink CSNK)
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Figure 2.--Conceptual drainage~basin system and its inputs
(Leavesley and others, 1983).

between field capacity and the wilting point. Water from snowmelt is ,assumed
to infiltrate into the soil up to a maximum specified quantity per day, and
any quantity greater than this maximum becomes surface runoff. When themax,-
imum water content of the soil profile is exceeded, the excess water is routed
to surface runoff or to subsurface and ground-water reservoirs.

Snowpack computations are done for each HRU using the energy-balance
method developed by Obled and Rosse (1977). Snowpack accumulation, evap-
oration and sublimation, water content, and melt are calculated for each day.

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To transfer parameter values to other drainage basins, model parameters
are categorized by the method in which they will be determined (L.G. ,Saindon
and 3.3. Vacarro, U.S. Geological Survey, written commun., 1985). Model
parameters and their respective definitions for three different categories
(1, 2, and 3) are listed in table 2. Category 1 includes nondistributed
parameters that are determined from regional climatic characteristics. These
parameters may be defined using long-term climatic data. Within the context
of this study, category 1 parameters do not change in the hydrologic regions.
To transfer values to an ungaged drainage basin, values for the particular
hydrologic region are used.

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