SPARROW Mappers

Science Center Objects

SPARROW mappers are interactive tools that allow the user to explore river streamflow and nutrient and sediment loads and yields and the importance of different sources of contaminants in a particular river basin. Data can be visualized using maps and interactive graphs and tables, and rankings can be shown by state, major watershed, hydrologic unit (HUC), and catchment.

USA Map showing Northeast, Southeast, Midwest, Southwest, and Pacific regions

Map of the regions delineated for use in SPARROW (SPAtially Referenced Regressions On Watershed attributes) models in the conterminous United States.

2012 Mappers

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

     NORTHEAST

     PACIFIC

     SOUTHEAST

     SOUTHWEST

 

 

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.

 

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).