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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Table 2.--Model parameters and definitions

[Based on categories from L.G. Saindon and J.3. Vacarro (U.S. Geological
Survey, written commun., 1985)]

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Parameter

Definition

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CATEGORY 1--NONDISTRIBUTED PARAMETER VALUES THAT ARE DETERMINED
MAINLY FROM REGIONAL CLIMATIC CHARACTERISTICS AND THAT APPLY
TO AN ENTIRE DRAINAGE BASIN OR REGION

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BST----------- Base air temperature above which precipitation is considered
rain and below which precipitation is considered all snow.
CTS----------- Air temperature-evapotranspiration coefficient for use in
Jensen-Raise equation.
CTW----------- Proportion of potential evapotranspiration that may be
sublimated from a snow surface.
DENI-~-------- Initial density of new-fallen snow.
DENMX--------- Average maximum-snowpack density.
FWCAP--------- Free water-holding capacity of snowpack.
PAT----------- Maximum air temperature that, when it is exceeded, causes
spring and summer precipitation to be rain.
SETCON-------- Snowpack-settlement time constant.
TLX/TLN------- Lapse rate for maximum/minimum daily air temperature.
TST----------- Temperature index to determine beginning date of transpiration.

CATEGORY 2--VALUES FOR PARAMETERS DISTRIBUTED BY HYDROLOGIC RESPONSE
UNITS (HRU's ); DETERMINED FROM PHYSICAL CHARACTERISTICS,
SOILS, AND VEGETATION ON EACR UNIT.

COVDNS/COVDNW- Summer/winter vegetative cover density.
CTX----n-n-- Air temperature-evapotranspiration coefficient used in
Jensen-Raise equation.
ICOV---------- Predominant vegetative cover type (bare, grass, shrubs, trees).
ISOIL--------- Soil type (clay, loam, sand).
REMXnnnn'-- Maximum available water-holding capacity of soil' recharge zone.
RNSTS/RNSTW--- SUmmer/winter interception storage capacity of major vegetation
for rain. .
SCX/SCN------- MaximUm/minimum area contributing to surface runoff as a
proportion of HRU area.
SMAX---------- Maximum available water-holding capacity of soil profile.
SNST---nn--- Interception storage capacity of major vegetation for snow.
SRX----------- Maximum daily snowmelt infiltration capacity of soil profile.
TXAJ/TNAJ----- Adjustment for maximum/minimum air temperature for slope
and aspect.
TRNCF--------- Transmission coefficient for solar radiation through the
vegetative canopy.

CATEGORY 3--PARAMETERS DISTRIBUTED BY SUBSURFACE
OR GROUND-WATER RESERVOIRS.

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RCB----------- Ground-water routing coefficient.
RCF, RCP------ Subsurface-flow routing coefficients.
SEP----------- Coefficient for determining seepage from subsurface reservoirs
to ground-water reservoirs.

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