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United States Department of Agriculture

Agricultural Research Service

AnnAGNPS Pollutant Loading Model
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Overview: The AnnAGNPS PL model is a batch-process, continuous-simulation, pollutant loading (PL) computer model written in standard ANSI Fortran 95. It is being developed using Compaq Digital Visual Fortran 95 v6.6, and Lahey/Fujitsu Fortran 95 v5.6; and is expected to run on any PC's (386 or higher) under Windows 98, Windows NT, and Windows XP. Since Fortran 95 has a built in memory manager, the former DOS 640K limitation is no longer a concern. In fact, Fortran 95's memory manager will utilize available hard disk space for memory if necessary (virtual memory). The code utilizes Fortran 95's dynamic allocation capability; thus the actual memory requirements are dependent upon the size of the job mostly upon the number of cells. A practical minimum memory limit would be 32Mb. The PL's predicted are: (1) water; (2) sediment by particle size class & source of erosion; and (3) chemicals-nitrogen, phosphorus, organic carbon, & pesticides. PL's are generated from land areas (cells) and routed through stream systems on a daily basis. Special land use components such as feedlots, gullies, field ponds, and point sources are included.

Contact: Ron Bingner or Fred D. Theurer

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A.

Chemical Routines In situ

H.

Hydrograph Development

O.

Soil Composite

B.

Chemical Reach Routing

I.

Impoundments

P.

Soil Moisture and Curve Number

C.

Erosion Routine RUSLE

J.

Internal Data Preparation

Q.

Source Accounting

D.

Error Checking

K.

Irrigation

R.

Water Reach Routing

E.

Event Output File

L.

Overall System

S.

Winter Routines

F.

Feedlot

M.

Read Input

T.

Field Pond

G.

Gullies

N.

Sediment Reach Routing

 

= Current Feature = Under Development = Future Feature


Last Modified: 12/5/2013
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