Scientific Investigations Report 2006-5035

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006-5035

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Table 8

Table 8. Basin characteristics considered during the low-flow regressin analyses for unregulated streams in Idaho.

[Equation variables are shown in bold]

Basin characteristic Explanation
AG Pasture and hay; row crops; small grains; fallow; urban or recreational grasses
A Area of drainage basin
Aluv alluvial deposits
Barren Bare rock, sand, or clay; quarries, mines, or pits; transitional
BS Average slope of drainage basin
DV Residential, commercial, industrial, or transportation lands
E Mean drainage basin elevation
F Deciduous, evergreen, or mixed forest land
Glacial Glacial drift and ice
Granite Granitic rocks
GT6000 Percentage of drainage basin area above 6,000 ft
HS Dec Median Dec 21 hillshading
HS June Median June 21 hillshading
Loess Loess
Met/Sed Metamorphic or sedimentary rocks
NF30 Percentage of drainage basin area with north-facing slopes greater than 30 percent
NF50 Percentage of drainage basin area with north-facing slopes greater than 50 percent
P Combination precipitation based on Molnau (1995) and PRISM (Daly and Taylor, 1998)
P2 PRISM (Daly and Taylor, 1998) precipitation
Perim Perimeter drainage basin, in miles
R Relief of drainage basin
S30 Percentage of drainage basin area with slopes greater than 30 percent
S 50 Percentage of drainage basin area with slopes greater than 50 percent
Sand Dune sand
Shdw Dec Percentage of drainage basin area in shadow on Dec 21
Shdw June Percentage of drainage basin area in shadow on June 21
Shrub Shrubland
Slope Average slope of drainage basin, in percent
Undefined Unclassified lithology units
Upland Grasslands or herbaceous lands
V Volcanic rocks
W Open water or perennial ice and snow
W(2) Open water
Wetland Woody wetlands; emergent, herbaceous wetlands
Woody Orchards or vineyards

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