SPARROW Mappers Active

2012 Mappers 

Sources/Usage: Public Domain. Visit Media to see details.

Sources/Usage: Public Domain. Visit Media to see details.

2012 SPARROW (SPAtially Referenced Regressions On Watershed attributes) mappers are available for 5 regions of the conterminous United States. These mappers simulate streamflow and constituent loads that would occur under long-term average hydrologic conditions, for the time period 1999 through 2014, and source inputs that occurred during or near 2012.  

Using the 2012 Mappers

Available data filters on the SPARROW Mappers allow you to view total phosphorus, total nitrogen, suspended sediment, and streamflow. 

The "Area of Interest" filter allows you to focus on a selected area (state, major watershed, HUC and catchment), while the "Group Results By" filter allows you to change the way the data is shown.

Modeling results can be exported as an Excel spreadsheet, a CSV file, or a geospatial dataset.
 

     MIDWEST

• Mapper: 2012 SPARROW Models for the Midwest: Total Phosphorus, Total Nitrogen, Suspended Sediment, and Streamflow
• Report: Spatially Referenced Models of Streamflow and Nitrogen, Phosphorus, and Suspended-Sediment Loads in Streams of the Midwestern United States (SIR 2019-5114)
• Model Data Release: SPARROW model inputs and simulated streamflow, nutrient and suspended-sediment loads in streams of the Midwestern United States, 2012 base year
   

     NORTHEAST

• Mapper: 2012 SPARROW Models for the Northeast: Total Phosphorus, Total Nitrogen, Suspended Sediment, and Streamflow
• Report: Spatially Referenced Models of Streamflow and Nitrogen, Phosphorus, and Suspended-Sediment Loads in Streams of the Northeastern United States (SIR 2019-5118)
• Model Data Release: SPARROW model inputs and simulated streamflow, nutrient and suspended-sediment loads in streams of the Northeastern United States, 2012 Base Year
   

     PACIFIC

• Mapper: 2012 SPARROW Models for the Pacific: Total Phosphorus, Total Nitrogen, Suspended Sediment, and Streamflow
• Report: Spatially Referenced Models of Streamflow and Nitrogen, Phosphorus, and Suspended-Sediment Loads in Streams of the Pacific Region of the United States (SIR 2019-5112)
• Model Data Release: SPARROW model inputs and simulated streamflow, nutrient and suspended-sediment loads in streams of the Pacific Region of the United States, 2012 base year
   

     SOUTHEAST

• Mapper: 2012 SPARROW Models for the Southeast: Total Phosphorus, Total Nitrogen, Suspended Sediment, and Streamflow
• Report: Spatially Referenced Models of Streamflow and Nitrogen, Phosphorus, and Suspended-Sediment Loads in Streams of the Southeastern United States (SIR 2019-5135)
• Model Data Release: SPARROW model inputs and simulated streamflow, nutrient and suspended-sediment loads in streams of the Southeastern United States, 2012 base year
   

     SOUTHWEST

• Mapper: 2012 SPARROW Models for the Southwest: Total Phosphorus, Total Nitrogen, Suspended Sediment, and Streamflow
• Report: Spatially Referenced Models of Streamflow and Nitrogen, Phosphorus, and Suspended-Sediment Loads in Streams of the Southwestern United States (SIR 2019-5106)
• Model Data Release: SPARROW model inputs and simulated streamflow, nutrient and suspended-sediment loads in streams of the Southwestern United States, 2012 base year

2002 Mappers

2002 SPARROW mappers simulate constituent loads that would occur under long-term average hydrologic conditions, for the time period 1970 through 2007, and source inputs that occurred during or near 2002.

• 2002 SPARROW Model Results for the Midcontinental Region of North America: Total Phosphorus and Total Nitrogen
• Eastern United States 2002 Nutrient Loading

SPARROW mapper source input years

Why 2012 as a base year?

SPARROW models simulate loads that would occur given source inputs for a specific year and flows based on long-term average hydrologic conditions.  Simulating long-term average hydrologic conditions allows modeling of large spatial areas without concern for the effects of localized, short-term variability in climatic conditions.

Source input years for the 2002 and 2012 models were chosen to represent the most up-to-date input data that was available at the time these models were initially constructed.  

The SPARROW Mappers replace the SPARROW Decision Support System (Booth and others, 2011).