1. General Model Information

Name: Hydrologic Unit Model of the United States

Acronym: HUMUS

Main medium: aquatic+terrestrial
Main subject: hydrology
Organization level: landscape
Type of model: not specified
Main application:
Keywords: hydrology, water, sediment, GIS


Raghavan Srinivasan
Blackland Research Center,Temple, TX
email: srin@brc.tamus.edu

Jeff Arnold
Natural Resources Systems Research Unit
USDA ARS, Temple, TX
email: arnold@brc.tamus.edu


Arnold, J.G., B.A. Engel, J.R. Williams, and R. Srinivasan.


HUMUS (Hydrologic Unit Model of the United States) quantifies water and sediment movement across the United States (Williams et al., 1985). Related to SWAT, it examines sediment movement and river flow across the country to assess water supply. The model has been executed on a 9000 km2 area in the Colorado River Basin and will be executed in the future in the Texas Gulf River Basin.

The model interfaces with both a GIS (GRASS) and a database (INFORMIX). The data input requirements include land use parameters, topography, and soils information. Outputs include water balance values, plant growth and chemical and sedimentation rates. The model can be executed on a variety of spatial scales. Temporal scale execution is typically annual with daily time steps.

Structure of HUMUS

Author of the abstract:


II. Technical Information

II.1 Executables:

Operating System(s): UNIX Run HUMUS interactively

II.2 Source-code:

Programming Language(s): FORTRAN with GIS interfaces written in C

II.3 Manuals:

II.4 Data:

III. Mathematical Information

III.1 Mathematics

III.2 Quantities

III.2.1 Input

III.2.2 Output

IV. References

Arnold, J.G., J.R. Williams, A.D. Nicks, and N.B. Sammons. 1990. SWRRB-A basin scale simulation model forsoil and water resources management. Texas A&M Press.College Station, TX. 255 pp.

Arnold, J.G. 1990. ROTO-A continuous water and sedimentrouting model. ASCE Proc. of the Watershed ManagementSymposium. Durango, CO. 480-488 pp.

Arnold, J.G. 1992. Spatial scale variability in model development and parameterization. Ph.D Thesis, Purdue University,West Lafayette, IN. pp 183.

Arnold, J.G., B.A. Engel, and R. Srinivasan. 1993. A Continuous time, grid cell watershed model.In: Proceedings of Application of Advanced Information Technologies for the Managementof Natural Resources. Sponsored by ASAE. June 17-19, 1993, Spokane, WA.

Committee on Conservation Needs and Opportunities,1986. Soilconservation: Assessing the national resource inventory. Volume 1,National Academy Press, Washington, D.C. 114 p.

Rosenthal, W., R. Srinivasan, and J.G. Arnold. 1993. A GIS watershed hydrology model link to evaluatewater resources of the Lower Colorado River in Texas.In: Proceedings of Application of Advanced Information Technologies for the Managementof Natural Resources. Sponsored by ASAE. June 17-19, 1993, Spokane, WA.

Srinivasan, R. and J.G. Arnold. 1993.Basin scale water quality modeling using GIS.In: Application of Advanced Information Technologies for Management ofNatural Resources. Sponsored by ASAE. June 17-19, 1993, Spokane, WA.

U.S. Army. 1987. GRASS reference manual.USA CERL, Champaign, IL.
Williams, J.R., A.D. Nick and J.G. Arnold. 1985.Simulator for water resources in rural basins. J. Hydraul. Eng.111(6):970-986.

V. Further information in the World-Wide-Web

VI. Additional remarks

Global change implications: The model can be applied to global change research because it examines hydrologic dynamics at a large scale. The interface with GIS may provideinsight on modification of a point model fospatial analysis.
Last review of this document by: Hailing Wang and T. Gabele: 25. 9. 1997 -
Status of the document:
last modified by Tobias Gabele Wed Aug 21 21:44:44 CEST 2002

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