Beta version 4 has arrived!
Beta version 4 is now available for most states on a trial basis, and version 3 remains available. Beta version 4 provides a single user interface (at http://streamstatsags.cr.usgs.gov/streamstats/) for all states that are implemented, rather than separate applications for each state, as in versions 2 and 3, and the user interface is more user friendly than previous versions. Information for user-selected ungaged sites currently cannot be obtained using beta version 4 for the States of Arkansas, Arizona, Georgia, Iowa, Indiana, Maryland, North Carolina, Oregon, South Carolina, and Tennessee because of unique functionality for those states that is not yet implemented. Users are encouraged to provide comments and report bugs by use of the Help button on the interface, which also provides access to limited beta version 4 documentation. See below for additional information about versions both 3 and 4.
Please contact the StreamStats by email at email@example.com if you have any questions.
StreamStats is available for Arizona on a limited basis. Currently, it allows users to select or enter a stream location and determine the following basin and climatic characteristics:
- Drainage area, in square miles;
- Minimum, maximum, and mean basin slope, in percent;
- X and Y coordinates of the basin centroid, in decimal degrees;
- Minimum, maximum, and mean basin elevations, in feet;
- Percentages of basin covered by forest, barren land, herbaceous shrubs, developed land, and impervious surfaces;
- Differences in the percentage of a basin covered by forest and developed land between 1992 and 2001;
- Percentage of basin greater than 5,000, 6,000, and 7,500 feet elevation;
- Mean annual and monthly precipitation, in inches;
- Mean annual monthly temperatures, degrees Fahrenheit;
- Maximum 24-hour precipitation that occurs on average once in 5, 10, 25, 50, 100, 200, and 500 years, in inches;
- Percent area with slopes greater than 30 percent from 10-meter DEM;
- Percent area with north facing slopes greater than 30 percent from 10-meter DEM;
- Total stream length in miles;
- Stream density in miles per square mile;
- Elevation of basin outlet, in feet;
- Basin perimeter, in miles;
- Basin relief, in feet; and
- Basin relative relief, in feet per mile.
The above basin characteristics are planned to be used in a regional regression analysis to develop equations for use in estimating flood-frequency statistics. Once the regional analysis is complete, StreamStats will implement the equations to provide peak-flow estimates of the 50-, 20-, 10, 4-, 2-, 1-, 0.5-, and 0.2-percent annual exceedance probabilities at any user selected stream location.
WARNING: Arizona StreamStats can compute a large number of basin characteristics, but for drainage basins larger than about 1000 square miles the computation process can take so long that the internet connection can time out before the report is produced if all basin characteristics are selected. In the Basin Characteristics tool window, the grid analysis cell size is given for each applicable basin characteristic. In any one request, the cell size used for processing will be the smallest of the cell sizes for the characteristics that are selected. In order to prevent time-out issues, it is recommended that for large drainage basins all basin characteristics using a 10-meter cell size be selected and run in a request that is separate from the remaining basin characteristics. If StreamStats times out before a report is produced, then usually the process is still running in the background. It usually is possible to wait a few more minutes and then use the Download tool to obtain a shapefile for the selected basin. The downloaded shapefile will contain a .dbf file that includes values for all basin characteristics that were computed for the selected site.
StreamStats was developed for Arizona in cooperation with the U.S. Dept. of the Interior, Bureau of Reclamation, the Flood Control District of Maricopa County, Greenlee County, the Flood Control District of Mohave County, the U.S. Dept. of Agriculture, Forest Service, the Pima County Regional Flood Control District, Pinal County, Cochise County, Navajo County, the Yavapai County Flood Control District, and the Salt River Project.
Contact Us if you experience any problems with this application.