The AnnAGNPS computer model not only predicts pollutant loadings (PL) throughout the stream network, but is also a nexus for certain other computer models that are useful for water quality analysis and their effects on aquatic resources. AnnAGNPS may be used to analyze PL’s for free-flowing stream systems involving sediment and chemical movement, but the most insidious and pervasive PL’s that effect aquatic resources are water temperature & fine sediments. The following computer models may be used with AnnAGNPS to study some of these topics.
Hydrologic Unit / Water Quality Model (HU/WQ)
Abstract: HU/WQ is a full-service, GIS-support computer model designed and developed to prepare input for PL computer models and display output from these models. While HU/WQ does not currently work directly with AnnAGNPS, it does work with AGNPS. NRCS plans to revise HU/WQ to work with AnnAGNPS. The following connection to the HU/WQ home page will provide the surfer with ample information as to facts, applicability, status, & accessibility of HU/WQ software & documentation.
Abstract: The stream network temperature model (SNTEMP) predicts the minimum, maximum, & average daily water temperatures throughout a stream network. Its input requirements include the daily water discharge that is calculated and produced as output by AnnAGNPS. Most of the remaining SNTEMP input is duplicated in the input to AnnAGNPS. Obviously, the same climate data & stream network system, including the hydraulic geometry, used for AnnAGNPS should also be used for SNTEMP. The only significant additional input to SNTEMP would be any local topographic influences & riparian vegetation (trees); i.e., physical dimensions that produce important shade on the stream’s water surface. SNTEMP is fully supported by the USGS Biological Resources Division including software, documentation, training, and even some specialized subsidiary computer programs.
Sediment Intrusion & Dissolved Oxygen Model (SIDO)
Abstract: The sediment intrusion & dissolved oxygen (SIDO) model predicts the daily sediment accumulation & DO status within a salmonid redd with special attention to the egg zone. In addition to local detailed hydraulic geometry for the redd and certain biological specifications particular to the specific salmonid species, SIDO requires daily water, sediment, and water temperature data that is output from AnnAGNPS & SNTEMP. The following connection to the SIDO home page will provide the surfer with full access to SIDO’s software & complete documentation.