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
 --