General Information

Project area general description
The state of Montana, the portion of Wyoming in the Yellowstone and  Little Missouri River Basins
Are any areas excluded?
Portions of the mainstem Milk, Missouri, and Yellowstone Rivers; and the Belle Fourche Basin in the extreme southeast corner of Montana
Types of flow statistics available
Peak flows statewide, and low flow frequencies; mean annual and mean monthly streamflows; and the 20-, 50-, and 80-percent durations for monthly and annual streamflows in Western Montana
ArcGIS version used for processing
10.2.2
Was TopoGrid used to process DEMs?
No
DEM and derivatives projection (general description)
NAD83 Albers
DEM and derivatives (fdr, fac, etc.) resolution
30 m
DEM source
NED
Hydrography source
NHDPlus Version 2
Hydrologic unit “walls” source
WBD
Gage basin boundaries source
Not used
Interactive map snapping tolerance
3 cells
Basin characteristics computed using continuous parameter grids (CPGs)
BSLDEM30M, ELEV, EL5000, EL6000, LC01CRPHAY, LC01FOREST, IRRIGAT_MT, LAKESNHDH, NFSL30_30M, PRECIP, SLOP30_30M, SLOP50_30M, ET0306MOD, ET0710MOD, LC01DEV, LC01WETLND

 

Basin Characteristics Methods and Sources

Name
Description
Computation method
Data source
Report
Variable in report
CONTDA
Contributing Drainage Area
Basin area
30M DEM and 30M flow direction grid
SIR 2015-5019-F, G
A
ELEV
Mean basin elevation, in feet
Area-weighted mean
30M DEM
SIR 2015-5019-F, G
E
TEMP
Mean annual temperature, in degrees Fahrenheit
Area-weighted mean
PRISM (United States) and Long Term Mean Climate Grids, 1971-2000 (Canada)
SIR 2015-5019-G
--
ELEVMAX
Maximum elevation in feet
Basin max elevation
30M DEM
SIR 2015-5019-F, G
--
MINBELEV
Minimum elevation in feet
Basin min elevation
30M DEM
SIR 2015-5019-F, G
--
RELIEF
Maximum – minimum elevation, in feet
Computed
30M DEM
SIR 2015-5019-F, G
--
EL5000
Percent of basin above 5,000 feet elevation
Basin percent
30M DEM
SIR 2015-5019-F, G
E5000
EL6000
Percent of basin above 6,000 feet elevation
Basin percent
30M DEM
SIR 2015-5019-F, G
E6000
IRRIGAT_MT
Percent of basin under some irrigation regime
Basin percent
Final Land Unit  (FLU) classification, Montana Department of Revenue (2014)
SIR 2015-5019-G
--
LAKESNHDH
Percent of basin covered in lakes, ponds, and reservoirs
Basin percent
NHD high resolution waterbodies
SIR 2015-5019-F, G
--
LC01CRPHAY
Percent of basin covered by agriculture
Basin percent
NLCD2001 and LCC2000
SIR 2015-5019-G
--
LC01DEV
Percent of basin covered by urban land
Basin percent
NLCD2001 and LCC2000
SIR 2015-5019-G
--
LC01WETLND
Percent of basin covered by wetlands
Basin percent
NLCD2001 and LCC2000
SIR 2015-5019-F, G
--
BSLDEM30M
Mean basin slope, in percent
Basin slope
30M DEM
SIR 2015-5019-F, G
--
SLOP30_30M
Percent of basin with slopes greater than or equal to 30 percent
Basin percent
30M DEM
SIR 2015-5019-F, G
SLP30
NFSL30_30M
Percent of basin with north-facing slopes greater than or equal to 30 percent
Basin percent
30M DEM
SIR 2015-5019-G
--
SLOP50_30M
Percent of basin with slopes greater than or equal to 50 percent
Basin percent
30M DEM
SIR 2015-5019-F, G
SLP50
PRECIP
Mean annual precipitation, in inches
Area-weighted mean
PRISM (United States) and Long Term Mean Climate Grids, 1971-2000 (Canada)
SIR 2015-5019-F, G
P
LC01FOREST
Percent of basin covered by forest
Basin percent
NLCD2001 and LCC2000
SIR 2015-5019-F, G
F
ET0306MOD
Average spring (March-June) mean monthly evapotranspiration (2000-2012) in inches
Area-weighted mean
MODIS global evapotranspiration product (MOD16)
SIR 2015-5019-F, G
ETSPR
ET0710MOD
Average summer (July - October) mean monthly evapotranspiration (2000-2012) in inches
Area-weighted mean
MODIS global evapotranspiration product (MOD16)
SIR 2015-5019-F, G
--